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15 Nov 09:37

A Novel Carbazolophane: A Comparison of the Performance of Two Planar Chiral CP‐TADF Emitters

by Jasmin Seibert, Yan Xu, Hassan Hafeez, Joachim Podlech, Ludovic Favereau, Eduard Spuling, Charlotte Waldhelm, Martin Nieger, Olaf Fuhr, Zahid Hassan, Jeanne Crassous, Ifor D. W. Samuel, Eli Zysman‐Colman, Stefan Bräse

New perspectives for the design of blue thermally activated delayed fluorescence (TADF) emitters exhibiting circularly polarized luminescence (CPL) are outlined. Two emitters (1,7)tBuCzpPhTrz and (1,4)tBuCzpPhTrz with modified planar chiral donor structures show the use of a novel cyclophane donor design, featuring a bowl-like geometry with strong rigidity, circularly polarized luminescence, and narrowed emission profile in comparison to its regioisomer.

Abstract

The prototypical example of a (cyclo)phane, [2.2]paracyclophane (PCP), has proven to be a versatile stereogenic moiety within the design of circularly polarized thermally activated delayed fluorescence (CP-TADF) emitters; however, the exploration of other cyclophanes within CP-TADF emitter design has been largely neglected. Here, a comparative study of the photophysical and optoelectronic properties of two cyclophane emitters, (1,7)tBuCzpPhTrz and its isomer (1,4)tBuCzpPhTrz, is presented. The carbazolophane-triazine compound (1,7)tBuCzpPhTrz, obtained via an unprecedented intramolecular rearrangement, is the first example of a planar chiral TADF emitter deviating from the PCP scaffold. Significant geometrical change of the enclosed carbazole in (1,7)tBuCzp results in an attenuation of the donor strength, while the merits of rigidity and steric bulk remain. In particular, the full width at half maximum (FWHM) of the photoluminescence spectrum in toluene of (1,7)tBuCzpPhTrz is reduced by 34% and blue-shifted by 20 nm compared to that of (1,4)tBuCzpPhTrz. In doped films, the compounds reach high photoluminescence quantum yields (Φ _PL) of 91 and 81%, respectively. The chiroptical properties reveal dissymmetry factors |g _PL| of up to 5 × 10⁻⁴. These results demonstrate the impact of the cyclophane for the development of CP-TADF materials and add to the currently limited scope of available planar chiral donors.

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15 Nov 09:32

Completely Fused Non‐Fullerene Acceptor Enables Efficient Postprocessing‐Free Organic Photovoltaics Cells

by Wenxuan Wang, Shaoqing Zhang, Tao Zhang, Chaoyi Wang, Zhihao Chen, Shuohan Cheng, Yang Xiao, Jianqiu Wang, Yong Cui, Jianhui Hou

In this work, a completely fused non-fullerene acceptor, GS-20 is synthesized, with strong aggregation properties. GS-20 can be utilized as a third component to accelerate aggregation process and modulate aggregation structure. Consequently, the ternary OPV cell achieves a maximum PCE of 19.0% without any post-treatments, which is also feasible for the fabrication of postprocessing-free OPV modules.

Abstract

The photovoltaic performance of organic photovoltaic (OPV) cells can be significantly improved by regulating the aggregation structure and film formation kinetics of the constituent materials. However, many regulation strategies, including the use of additives and annealing, require complex fabrication processes and additional investments, which poses challenges for the industrialization of OPV cells. In this work, a completely fused non-fullerene acceptor, GS-20 is designed and synthesized, with strong aggregation properties. The incorporation of GS-20 as a third component into the PBQx-TF:eC9-2Cl-based cell accelerates aggregation of eC9-2Cl and improves molecular stacking by promoting film deposition. The as-cast ternary OPV cells fabricated without any post-treatments exhibited a high V _OC of 0.890 V and a maximum PCE of 19.0%. Moreover, a postprocessing-free OPV module is fabricated using the blade coating method and obtains a satisfactory PCE of 13.5%, indicating excellent feasibility for large-scale preparation. This work realizes an efficient postprocessing-free OPV cell through molecular design and ternary strategy, facilitating the industrialization of OPV technology.

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15 Nov 09:32

Rational Design of Two Well‐Compatible Dimeric Acceptors Through Regulating Chalcogen‐Substituted Conjugated Backbone Enable Ternary Organic Solar Cells with 19.4% Efficiency

by Wanying Feng, Yuyang Bai, Jia Wang, Yanyi Zhong, Jiaying Wang, Tianqi Chen, Jiangbin Zhang, Kai Han, Xiangjian Wan, Bin Kan, Yongsheng Chen

Two well-compatible dimeric acceptors, DC9-HD and DYSe-3, are utilized to fabricate ternary organic solar cells. The incorporation of red-shifted DYSe-3 into the PM6:DC9-HD binary blend optimize the morphologies and suppressed charge recombination. This, combined with their long exciton diffusion length and low voltage loss, contributes to an impressive efficiency of 19.4% for PM6:DC9-HD:DYSe-3 ternary devices.

Abstract

To enhance the performance of dimeric acceptors (DMAs) based organic solar cells (OSCs), two new DMAs, designated as DC9-HD and DYSe-3, are rationally developed and employed to fabricate ternary OSCs. The substitution of the sulfur atom on the outer ring of the fused-ring core of DC9-HD with a selenium atom resultes in the red-shifted DYSe-3. Despite these minor differences, DC9-HD and DYSe-3 possess nearly identical conjugated skeletons, which contribute to their similar packing motifs and crystallinities, ultimately enabling a high degree of miscibility between two DMAs. Upon incorporating DYSe-3 into the host PM6:DC9-HD binary blend, fibril-like morphologies featured with diameters of ≈16.9 nm and reduced charge recombination are observed in the PM6:DC9-HD:DYSe-3 ternary blend. More importantly, owing to their long exciton diffusion lengths and low voltage losses, a remarkable power conversion efficiency of 19.4% is achieved for the ternary OSCs, alongside a delicate balance between open-circuit voltage and short-circuit current density. This super result is comparable to the best performance of oligomer acceptor based OSCs reported to date. Furthermore, the proposed ternary strategy, which combines one polymer donor and two well-compatible DMAs, not only retains the advantages of DMAs but also offers a streamlined approach for fabricating high-performance ternary OSCs.

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15 Nov 09:27

Tailor‐Made Buffer Materials: Advancing Uniformity and Stability in Perovskite Solar Cells

by Thanh‐Danh Nguyen, Doyeong Yeo, Ramesh Kumar Chitumalla, Sun‐Ju Kim, Gyeong‐Ho Jeong, Dong‐Gun Kwun, Joonkyung Jang, In Hwan Jung, Ji‐Youn Seo

This study presents a new modification of bathocuproine (BCP) in perovskite solar cells (PSCs), where the nitrogen atoms are positioned inside the molecule for added stability. This structural adjustment enhances charge transport and device durability. Experimental results show reduced energy losses and improved long-term performance, highlighting the potential of this modified BCP for more efficient and stable PSCs.

Abstract

Along with the growing popularity of the p-i-n structure, bathocuproine (BCP) is increasingly recognized as a crucial buffer layer between the electron transport layer and electrode with the role of mitigating Schottky contact and enhancing performance. However, the chemical structure and role of its functional groups have not been thoroughly elucidated. This study introduces a novel modification of BCP in perovskite solar cells (PSCs) by altering functional groups to optimize their geometrical molecular structures and electronic properties. The substitution of aromatic phenyl and p-tolyl groups to 2,9-position on the BCP is highly effective in increasing the planarity of the conjugated backbone and protecting the reactive nitrogen atoms of the phenanthroline core, thereby improving charge transport and device stability. Experimental analyses, including electrostatic force microscopy, impedance spectroscopy, and photoluminescence, reveal that the modified BCP significantly enhances charge transport, reduces recombination losses, and markedly improves the structural stability of PSCs, leading to prolonged device lifetimes. The findings highlight the potential of structurally optimized BCP derivatives as a critical component in advancing high-efficiency and durable PSCs.

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15 Nov 09:25

Polymeric Charge‐Transporting Materials for Inverted Perovskite Solar Cells

by Xiaodong Hu, Lingyuan Wang, Siwei Luo, He Yan, Shangshang Chen

Polymeric charge transporters hold immense potential for inverted perovskite solar cells due to their tunable structures, high conductivity, and inherent flexibility. This review comprehensively explores recent advancements in these polymeric materials, while also delving into the remaining challenges and proposing practical design strategies for their future optimization.

Abstract

Inverted perovskite solar cells (PSCs) hold exceptional promise as next-generation photovoltaic technology, where both perovskite absorbers and charge-transporting materials (CTMs) play critical roles in cell performance. In recent years, polymeric CTMs have played an important role in developing efficient, stable, and large-area inverted PSCs due to their unique properties of high conductivity, tunable structures, and mechanical flexibility. This review provides a comprehensive overview of polymeric CTMs used in inverted PSCs, encompassing polymeric hole transport materials (HTMs) and electron transport materials (ETMs). the relationship between their molecular structures, modification strategies are systematically summarized and analyzed for adjusting energy levels, and improving charge extraction, enabling a deep understanding of these widely used materials. The review also explores effective strategies for designing even more efficient polymeric CTMs. Finally, an outlook is proposed on the exciting research of novel polymeric CTMs, paving the way for their commercialized applications in PSCs.

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15 Nov 09:25

A Stepwise Melting‐Polymerizing Molecule for Hydrophobic Grain‐Scale Encapsulated Perovskite Solar Cell

by Riming Sun, Shaoyu Chen, Qingyun He, Pinghui Yang, Xuan Gao, Mengyang Wu, Junbo Wang, Chongyu Zhong, Xiangru Zhao, Mubai Li, Qiushuang Tian, Yingguo Yang, Aifei Wang, Wei Huang, Renzhi Li, Tianshi Qin, Fangfang Wang

Stepwise melting-polymerizing molecule (SMPM) additive enables grain-scale encapsulated perovskite, achieving highly water-resistant perovskite solar cells (PSCs) with 25.21% efficiency and over 2000h T₉₅ stability under 85% relative humidity. Unencapsulated SMPM-PSCs even operate underwater and show effectively suppressed Pb-leakage, potentially solving stability and environmental concerns for PSC commercialization.

Abstract

Despite the ongoing increase in the efficiency of perovskite solar cells, the stability issues of perovskite have been a significant hindrance to its commercialization. In response to this challenge, a stepwise melting-polymerizing molecule (SMPM) is designed as an additive into FAPbI₃ perovskite. SMPM undergoes a three-stage phase transition during the perovskite annealing process: initially melting from solid to liquid state, followed by overflowing grain boundaries, and finally self-polymerizing to form a hydrophobic grain-scale encapsulation in perovskite solar cells, providing protection against humidity-induced degradation. With this unique property, coupled with the advantages of improved crystallization, diminished non-radiative recombination, and energy level alignment, FAPbI₃-based perovskite solar cells with a 25.21% (small-area) and 22.94% (1 cm²) power conversion efficiency and over 2000 h T95% stability under 85% relative humidity is achieved. Furthermore, the SMPM-based perovskite solar cells without external encapsulations sustain impressive stability during underwater operation, in which the black FAPbI₃ phase is maintained and Pb-leakage is also effectively suppressed. Therefore, the SMPM strategy can offer a sustainable settlement in both stability and environmental issues for the commercialization of perovskite solar cells.

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15 Nov 08:02

A novel deep-blue fluorescent emitter employed as an identical exciplex acceptor for solution-processed multi-color OLEDs

J. Mater. Chem. C, 2024, Advance Article
DOI: 10.1039/D4TC04073B, Paper

Jie Pan, Shiyue Zhang, Zhongxin Zhou, Yongtao Zhao, Shujing Jin, Yanju Luo, Weiguo Zhu, Yu Liu
BOBTFB, a blue fluorescent emitter has been synthesized, and used as an exciplex accepter which is combined with different donors (TCTA, TAPC, m-MTDATA) to produce emission of different colors (blue, green, yellow, white).
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15 Nov 07:59

Tunable color-stable hybrid white OLEDs by combining fluorescent and TADF emitters in a single emissive layer

J. Mater. Chem. C, 2024, Advance Article
DOI: 10.1039/D4TC03934C, Paper

Upasana Deori, Thamodharan Viswanathan, Nisha Yadav, Pachaiyappan Rajamalli
Tuning of hybrid white organic light-emitting diodes from cool and pure to warm white emission by varying the dopant concentration from 0.5 wt% to 1.0 wt%.
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15 Nov 07:59

Solution-processable benzothiadiazole/triphenylamine-based hybridized local and charge-transfer (HLCT) hyper-structured molecular red emitters for OLEDs

J. Mater. Chem. C, 2024, Advance Article
DOI: 10.1039/D4TC02377C, Paper

Xiaoyu Yin, Junrong Pu, Chen Ma, Yi Wu, Kunlun Wang, Yingliang Liu, Shaokui Cao, Shi-Jian Su, Shengang Xu
A hyper-structured molecular HLCT red emitter CRA–MTBP₍₈₎–mCP₍₀₎-based non-doped device emitted red light with an EL emission peak at 651 nm, an EQE_max of 1.35% with low roll-off and a L_max of 2831 cd m⁻².
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14 Nov 04:03

Highly transparent all-perovskite luminescent solar concentrator/photovoltaic windows

J. Mater. Chem. A, 2024, Advance Article
DOI: 10.1039/D4TA06249C, Paper

Seungju Oh, Sang Woo Bae, Tae Hyung Kim, Gumin Kang, Heesuk Jung, Young-Hoon Kim, Minwoo Park
Series-connected perovskite solar cells are coupled with Mn:CsPbCl₃ NCs/PS LSCs, exhibiting an optical efficiency of 5.38% and power conversion efficiency of 0.43% at G = 25 with suppressed PL reabsorption due to the large Stokes shift of the NCs.
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14 Nov 04:01

Efficient fully textured perovskite silicon tandems with thermally evaporated hole transporting materials

Energy Environ. Sci., 2024, Advance Article
DOI: 10.1039/D4EE03899A, Paper

Open Access

&nbsp This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.

Bhushan P. Kore, Oussama Er-raji, Oliver Fischer, Adrian Callies, Oliver Schultz-Wittmann, Patricia S. C. Schulze, Martin Bivour, Stefaan De Wolf, Stefan W. Glunz, Juliane Borchert
Utilizing thermally evaporated hole transport layers (HTLs) in fully textured perovskite silicon tandem solar cells.
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14 Nov 04:00

Photoexcited Polaron Relaxation as a Structurally Sensitive Reporter of Charge Trapping in a Conducting Polymer

by Abdul Rashid Umar, Austin L. Dorris, Christopher Grieco

The use of transient absorption spectroscopy to study charge carrier trapping in conducting polymers is demonstrated using chemically doped polymer models. Photoexcited polarons exhibit dispersive relaxation kinetics that reflects the distribution of mobile and trapped carriers as a function of film morphology. Results show that local chain ordering, and not crystallinity, is paramount for the formation of mobile carriers.

Abstract

Conjugated polymers (CPs) play a central role in electronic applications due to their easily tuned electronic and ionic conductivities via chemical or electrochemical doping. Although doping improves charge conduction by introducing high densities of carriers into the CP, the accompanying structural changes and their impact on carrier mobility remain elusive. Methods capable of probing carrier distributions and their dependence on polymer morphology are needed to better understand how to improve conductivity. Here, a transient absorption (TA) spectroscopy approach is demonstrated, capable of directly probing mobile and trapped carriers in doped CPs and that is also sensitive to polymer nanostructure by using a model polythiophene system with tuned crystallinity. Exciting polarons in the polymer films produces distinct photoinduced absorption signals in the near-infrared spectrum that decay during the picosecond timescale in the form of biphasic, stretched exponential kinetics, which reflect a distribution of mobile (free) and trapped polarons. The kinetic analysis provides evidence for mobile polarons irrespective of polymer film crystallinity, whereas polarons located in impure amorphous phases with reduced chain ordering exist within a deeper distribution of trap states. Altogether, these observations suggest a stronger correlation of carrier trapping with local chain ordering (planarity or aggregation) rather than polymer crystallinity.

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14 Nov 03:59

Conjugated Group Tuning of Self‐Assembled Monolayer for Efficient Hole‐Transport Layer in Organic Solar Cells

by Shuangjiao Gao, Ruixiang Peng, Yi Qiu, Hui Liu, Yujie Wu, Xiyun Li, Yahui Zhang, Fei Jin, Ziyi Ge

A series of self-assembled molecules, namely t-Bu-3PACz, Ph-3PACz, and Bz-3PACz, are synthesized and investigated in organic solar cells (OSCs). Among them, the twisted phenyl groups ensure excellent solubility and sufficient intermolecular interaction to fine-tune the self-assembled behavior. Therefore, the device based on Ph-3PACz exhibits a superior power conversion efficiency (PCE) of 19.2% in PM6:eC9-based binary OSCs.

Abstract

P-type carbazole-derived self-assembled monolayers (SAMs) have garnered significant attention as promising hole transport layers (HTLs) in the development of highly efficient organic solar cells (OSCs). However, it still lacks the effective navigation to modulate the terminal functional groups of SAMs to achieve a compromise between the highest occupied molecular orbital (HOMO) energy levels and self-aggregation behavior. Herein, the terminal functional groups are adjusted and three SAMs are synthesized, namely, t-Bu-3PACz, Ph-3PACz, and Bz-3PACz to comprehensively investigate their intrinsic properties and influence on photovoltaic performance. Among them, Ph-3PACz featuring an exceptionally suitable conjugated region and steric hindrance exhibits the best compatibility with the active layer, superior electrical conductivity, HOMO energy level aligning with polymer donor, and ordered film packing. As a result, the photovoltaic devices based on Ph-3PACz exhibit an open-circuit voltage (V_OC ) of 0.850 V, a short-circuit current density (J_SC ) of 28.7 mA cm^−2, and a fill factor (FF) of 78.5%, thus resulting in a remarkable power conversion efficiency (PCE) of 19.2%. This work provides an effective and easily navigable method to modulate the molecular packing and energy levels of SAMs, thereby achieving highly efficient OSCs.

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14 Nov 03:58

Internal Encapsulation Enables Efficient and Stable Perovskite Solar Cells

by Wang Li, Xiaozhi Bao, Annan Zhu, Hao Gu, Yulin Mao, Bingzhe Wang, Gang Wang, Jia Guo, Ying Li, Guichuan Xing

The PTFE is introduced as an effective internal encapsulation layer between the perovskite film and the electron transport layer in the inverted PSCs. As a result, the optimized PTFE-based device achieved an impressive champion PCE of 25.49%. Additionally, the internally encapsulated perovskite device effectively prevents ion migration and water erosion, demonstrating excellent long-term stability even without external encapsulation.

Abstract

Perovskite solar cells (PSCs) have made significant strides in efficiency, but their long-term stability remains a challenge. While external encapsulation mitigates extrinsic degradation and lead leakage, it does not fully address performance decline due to ion migration within the perovskite devices. Therefore, an internal encapsulation layer that can selectively transport charge carriers and suppress ion migration across the interface is of great significance for achieving long-term stability in these devices. Here, polytetrafluoroethylene (PTFE) can serve as an effective internal encapsulation layer between the perovskite film and the electron transport layer in the inverted PSCs is demonstrated. The PTFE layer can selectively transport electrons and suppress ion diffusion, resulting in a higher power conversion efficiency (PCE) of 25.49% compared to 24.74% of the control devices and much better long-term stability. Even after 1500 h of air exposure, the internal encapsulated perovskite devices can maintain 92.6% of their original PCE, outperforming the control devices at 80.4%. This approach offers a novel solution for addressing ion migration-induced instability in perovskite devices.

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14 Nov 02:57

Functionalized 2D/3D Heterojunction with Reversible Iodine‐Alkenes Reaction in Perovskite Solar Cells

by Hui Yang, Zhengbo Cui, Wen Li, Xuemin Guo, Chunyan Lu, Haobo Yuan, Yuyang Hu, Wenxiao Zhang, Xiaodong Li, Junfeng Fang

Functionalized 2D/3D heterojunction is constructed through reversible iodine-alkenes reaction in 3-butenylamine (BEA) based 2D perovskite (BEA)₂[PbBr₄]. (BEA)₂[PbBr₄] can adsorb photo-generated iodine species during perovskite degradation, inhibiting the iodine loss issue in PSCs. These adsorbed iodine can still react with Pb⁰, eliminating related defects. The resulting PSCs exhibit good operational stability without encapsulation, retaining ≈94% of initial efficiency after MPP tracking for 2000 h at 65 °C with ISOS-L-2 protocol.

Abstract

Long-term operational stability remains a big challenge for perovskite solar cells (PSCs), especially under ISOS protocol with high temperature. One key reason lies in the iodine loss issue during PSCs aging. Motived by the reversible iodine-alkenes reaction, 3-butenylamine (BEA) based 2D perovskite (BEA)₂[PbBr₄] is used to construct a functionalized 2D/3D heterojunction in PSCs. (BEA)₂[PbBr₄] can chemically adsorb photo-generated iodine species during perovskite degradation through a typical reaction between neutral iodine and terminal alkenes, thus inhibiting iodine loss or diffusion in PSCs. Besides, owing to the reversible reaction nature, these adsorbed iodine species can be partially released slowly under heat conditions, further reacting with and eliminating potential metallic Pb⁰ defects. The resulting PSCs exhibit a high efficiency of 24.5% with good operational stability even without encapsulation, retaining ≈94% of initial efficiency after MPP tracking for 2000 h at 65 °C with ISOS-L-2 protocol.

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14 Nov 02:56

Exceeding 23% Efficiency for 3D/3D Bilayer Perovskite Heterojunction MAPbI3/FAPbI3‐Based Hybrid Perovskite Solar Cells with Enhanced Stability

by Jyoti V. Patil, Sawanta S. Mali, Chang Kook Hong

This work emphasizes the significant milestone of exceeding 23% efficiency, the use of advanced 3D/3D bilayer perovskite heterojunctions (BPHJ), the specific materials (MAPbI₃ and FAPbI₃). Additionally, the work emphasizes the achievement of enhanced stability, addressing a critical challenge in the development of hybrid perovskite solar cells, thereby making them more viable for long-term application.

Abstract

Organic–inorganic hybrid perovskite solar cells (HPSCs) are gaining attention as a promising technology for next-generation photovoltaic devices owing to their impressive power conversion efficiency (PCE) and cost-effective fabrication methods. Although, solution-processed passivation using 2D perovskites can improve the interface recombination, this approach hampers its effective charge transportation. In this study, the study investigates the properties and performance of the bilayer 3D/3D methylammonium lead iodide (MAPbI₃)/formamidinium lead iodide (FAPbI₃)-based perovskite heterojunction (BPHJ) to address these concerns. The bilayer structure consists of two distinct perovskite absorbers having independent structure that are sandwiched between two charge transporting layer (CTLs) to make functional device. First, the fabrication process is optimized to achieve high-quality MAPbI₃ perovskite films with controlled morphology and crystallinity followed by the formation of BPHJ using FAPbI₃ deposition by thermal evaporation technique. The BPHJ-160 nm-based PSCs with optimized parameters exhibit an enhanced PCE of 23.08% compared to single-layer reference (20.15%) device. The improved performance can be attributed to the effective charge extraction at the heterojunction interface and reduced charge recombination losses due to favorable energy levels. Furthermore, the long-term stability of the BPHJ-based perovskite device is assessed under continuous illumination along with its ambient and thermal stability across different environmental conditions.

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13 Nov 09:31

Boosting Carrier Transport in Quasi‐2D/3D Perovskite Heterojunction for High‐Performance Perovskite/Organic Tandems

by Shuaiqing Kang, Ziyue Wang, Weijie Chen, Zhichao Zhang, Jianlei Cao, Jialei Zheng, Xingxing Jiang, Jiacheng Xu, Jixiang Yuan, Juan Zhu, Haiyang Chen, Xining Chen, Yaowen Li, Yongfang Li

A quasi-2D/3D heterojunction-based WBG perovskite is constructed to repair the surface defects and weaken the quantum-well confinement effect. These advances reduce interfacial carrier transport loss, contributing to balanced carrier recombination in the interconnecting layer. The resulting perovskite/organic tandems exhibit record power conversion efficiencies of 25.92% (0.0628 cm²) and 24.63% (1.004 cm²), as well as robust operational stability.

Abstract

Wide-bandgap (WBG) perovskites are continuously in the limelight owing to their applicability in tandem solar cells. The main bottlenecks of WBG perovskites are interfacial non-radiative recombination and carrier transport loss caused by interfacial defects and large energy-level offsets, which induce additional energy losses when WBG perovskites are stacked with organic solar cells in series because of unbalanced carrier recombination in interconnecting layer (ICL). To solve these issues, 1,3-propanediammonium iodide (PDADI) is incorporated to form Dion–Jacobson -phase quasi-2D perovskites with mixed high-n-values in WBG perovskites. PDADI simultaneously repairs the shallow/deep defects and establishes a Type-II energy-level alignment between quasi-2D/3D and 3D perovskites for rapid carrier extraction. More importantly, the short-chain diammonium cation in quasi-2D perovskite with high n-values results in a short Pb–I inorganic layer spacing, which enhances the interlayer electronic coupling and weakens the quantum-well confinement effect that restricts carrier transport. The suppressed transport loss increases the electron concentration in the ICL for balanced carrier recombination. The 0.0628 and 1.004 cm² perovskite/organic tandems achieve remarkable efficiencies of 25.92% and 24.63%, respectively. The quasi-2D capping layer can inhibit ion migration, allowing perovskite/organic tandems to show excellent operational stability (T ₈₅ > 1000 h).

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13 Nov 09:31

Bridge editing of spin-flip emitters gives insight into excited state energies and dynamics

Chem. Sci., 2024, 15,20251-20262
DOI: 10.1039/D4SC05860G, Edge Article

Open Access

&nbsp This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.

Florian Reichenauer, Robert Naumann, Christoph Förster, Winald R. Kitzmann, Antti-Pekka M. Reponen, Sascha Feldmann, Katja Heinze
The bridge X of the chelate ligand modifies doublet and quartet state energies and the excited state dynamics of luminescent chromium(III) complexes.
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13 Nov 09:29

Suppressed surface lattice vacancies and distortion through lattice anchoring for efficient FAPbI3 perovskite quantum dot solar cells

Energy Environ. Sci., 2024, Advance Article
DOI: 10.1039/D4EE04112G, Paper

Mingxu Zhang, Xinyi Mei, Guoliang Wang, Junming Qiu, Zhimei Sun, Xiaoliang Zhang
A facile surface lattice anchoring strategy is reported to stabilize the surface lattice of perovskite quantum dots, which could substantially improve their optoelectronic properties and crystal stabilities for application in solar cells.
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13 Nov 09:29

Self-assembled porous salt crystals for solar-powered crystallization

Energy Environ. Sci., 2024, Advance Article
DOI: 10.1039/D4EE04741A, Paper

Jie Yu, Lenan Zhang, Jintong Gao, Wenyu Han, Ruzhu Wang, Zhenyuan Xu
Leveraging the self-amplifying salt creeping and efflorescence effects, the salt crystals self-assemble to form a hierarchical porous salt evaporator, enabling passive liquid supply and efficient evaporation.
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11 Nov 07:33

[ASAP] Photoremixing of Photosegregated Formamidinium/Cesium Lead Iodide/Bromide Thin Films under Pulsed Laser Excitation

by Halyna Okrepka, Lorenzo Franzini, Stefania Pagliara, and Masaru Kuno

TOC Graphic

ACS Energy Letters

DOI: 10.1021/acsenergylett.4c02582

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11 Nov 07:32

[ASAP] Scalable Microscale Artificial Synapses of Lead Halide Perovskite with Femtojoule Energy Consumption

by Jeroen J. de Boer and Bruno Ehrler

TOC Graphic

ACS Energy Letters

DOI: 10.1021/acsenergylett.4c02360

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11 Nov 07:29

Simple‐Structure and Anti‐Quenching Deep‐Blue Multi‐Resonance TADF Emitters Enable High‐Efficiency OLEDs with BT.2020 Blue Gamut

by Mingxin Xing, Guohao Chen, Shuni Wang, Xiaojun Yin, Jiahui Liu, Zhuixing Xue, Nengquan Li, Jingsheng Miao, Zhongyan Huang, Chuluo Yang

By decorating the MR skeleton with alkyl groups, and subsequently a diarylamino group at the para-position of a boron atom, an ideal narrowband pure-blue MR-TADF emitter is developed, and the corresponding OLEDs exhibit state-of-the-art performance with EQEs of up to 33.4 % and a CIEy of 0.046.

Abstract

Developing highly efficient pure-blue organic light-emitting diodes (OLEDs) that meet the stringent BT.2020 standard by using multi-resonance thermally activated delayed fluorescence (MR-TADF) materials has long been a formidable challenge. In this study, a strategy is demonstrated for high-performance blue MR-TADF emitters by gradually decorating the MR framework with alkyl groups, and subsequently introducing a diarylamino group at the para-position of boron atom. The proof-of-concept molecule, IPrBN-mCP, exhibits a narrowband deep-blue emission peaking at 452 nm, with a very narrow full-width at half maximum (FWHM) of 19 nm in solution, and a remarkably high photoluminescence quantum yield (PLQY) approaching unity in doped films. As a result, OLEDs based on IPrBN-mCP achieve not only a high maximum external quantum efficiency (EQE_max) of 33.4% but also ultrapure blue emission with a Commission Internationale de L'Eclairage (CIE) y value of 0.046, fully satisfying the BT.2020 blue standard. This represents the first OLED example fully meeting the rigorous color requirements of the BT.2020 blue standard while simultaneously achieving an EQE exceeding 30%.

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11 Nov 07:27

Buried Interface Strategies with Covalent Organic Frameworks for High‐Performance Inverted Perovskite Solar Cells

by Shuai Yang, Jiandong He, Zhihui Chen, Hao Luo, Jinbei Wei, Xuyang Wei, Hao Li, Jiadi Chen, Weifeng Zhang, Jizheng Wang, Shu Wang, Gui Yu

Two donor–acceptor covalent organic frameworks are developed to control the perovskite energy level and defects at the buried interface of inverted devices. The power conversion efficiency is improved to 25.68% for conventional bandgap devices and 22.92% for wide-bandgap devices. Additionally, these cells demonstrated excellent stability, establishing a solid foundation for the commercialization of perovskite/silicon tandem solar cells.

Abstract

Simultaneously controlling defects and film morphology at the buried interface is a promising approach to improve the power conversion efficiency (PCE) of inverted perovskite solar cells (PSCs). Here, two new donor‒acceptor type semiconductive covalent organic frameworks (COFs) are developed, COF_TPA and COF_ICZ. The carefully designed COFs structure not only effectively regulates the morphology and defects of the buried interface film, but also realizes the alignment with the energy level of the perovskite film and enhances the extraction and transmission of the interface charge. Among them, COF_ICZ-treated inverted PSCs achieved a maxmum PCE of 25.68% (certified 25.14%), the inverted PCE reached a minimum PCE of 22.92% for 1 cm² device. The efficiency of inverted PSCs with a 1.68 eV wide bandgap reached 22.92%, which is the highest datum of the reported 1.68 eV wide bandgap PSC. This lays the groundwork for the commercialization of perovskite/silicon tandem solar cells. Additionally, the unencapsulated devices demonstrated a high degree of stability during operational use and when subjected to conditions of high humidity and temperature.

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11 Nov 07:25

Efficient narrowband bluish-green emitters derived from a double-carbazole-fused organoboron multiple resonance skeleton with internal-structure modification

J. Mater. Chem. C, 2024, 12,5386-5392
DOI: 10.1039/D3TC04771G, Paper

Tong-Yuan Zhang, Ying-Chun Cheng, Hui Wang, Feng Huang, Xin Xiong, Xiao-Chun Fan, Jia Yu, Kai Wang, Xiao-Hong Zhang
Two green multiple resonance (MR) emitters were developed via internal-structure modification of CzBN, which not only extends the π-conjugated backbone towards red-shifted emission, but also improves the MR characteristics for narrowband features.
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11 Nov 06:13

How crystal structure and microstructure can influence the sodium-ion conductivity in halide perovskites

J. Mater. Chem. A, 2024, 12,33707-33722
DOI: 10.1039/D4TA05371K, Paper

Open Access

&nbsp This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.

Xabier Martinez de Irujo-Labalde, Tong Zhao, Bibek Samanta, Tim Bernges, Vasiliki Faka, Alexander N. Sobolev, Oliver Maus, Markus Appel, Marvin A. Kraft, Michael Ryan Hansen, Wolfgang G. Zeier
The herein presented study of the Na_3−2xIn(III)_1−xTa(V)_xCl₆ system with respect to their perovskite crystal structure, microstructure, and ionic transport properties demonstrates the coupling among these three aspects.
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11 Nov 06:13

Highly transparent ternary bulk-heterojunctions for semi-transparent organic photovoltaics

J. Mater. Chem. A, 2024, 12,32328-32337
DOI: 10.1039/D4TA05409A, Paper

Hryhorii P. Parkhomenko, Andrii I. Mostovyi, Nora Schopp, Mykhailo M. Solovan, Viktor V. Brus
Organic ternary bulk-heterojunctions achieve a record average visible transmittance (AVT) with the inclusion of the wide bandgap organic semiconductor PTAA, elevating AVT of PCE10 : PTAA : COTIC-4F to 81%.
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11 Nov 04:50

Interfacial coordination utilizing chelating ligands for operationally stable perovskite solar modules

Energy Environ. Sci., 2024, 17,9601-9610
DOI: 10.1039/D4EE02803A, Paper

Bingkun Tian, Peikun Zhang, Tianjun Liu, Weicun Chu, Yuyang Long, Peng Xu, Ying Jiang, Jinping Zhang, Yajing Tang, Xiangnan Sun, Riming Nie, Xiaoming Zhao, Wanlin Guo, Zhuhua Zhang
An interfacial coordination strategy with chelating ligands enhances both efficiency and stability in large-scale solar modules.
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11 Nov 04:50

Metastable interphase induced pre-strain compensation enables efficient and stable perovskite solar cells

Energy Environ. Sci., 2024, Advance Article
DOI: 10.1039/D4EE03801K, Paper

Hongyu Xu, Yun Xiao, Karim A. Elmestekawy, Pietro Caprioglio, Qiuyang Li, Qixuan Zhong, Yongqiang Ji, Tianyu Huang, Haoming Yan, Yingguo Yang, Laura M. Herz, Qihuang Gong, Henry J. Snaith, Rui Zhu, Lichen Zhao
We developed a pre-strain compensation strategy by introducing a metastable interphase at the buried interface to release the thermal-induced residual tensile strain in perovskite films, leading to highly efficient and stable perovskite solar cells.
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