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25 Oct 02:24

[ASAP] A Temperature-Sensitive Fluorescent Supramolecular Polymer Constructed by Discrete Platinum(II) Metallacycle and Pillar[5]arene-Based Host–Guest Interactions

by Wentao Hu, Ke Wang, Xupeng Li, Xiliang Fan, Wen-Juan Qu, Tai-Bao Wei, Qi Lin, and Bingbing Shi

TOC Graphic

Inorganic Chemistry
DOI: 10.1021/acs.inorgchem.4c03727
24 Oct 06:58

[ASAP] Longitudinal Homogenized Intermediates Facilitate Air-Processed Hybrid Sequential Deposition of Perovskite/Silicon Tandem Solar Cells

by Jiahao Fang, Weiwei Chen, Shaojie Yuan, Shaofei Yang, Hongguang Meng, Kaitian Mao, Tieqiang Li, Zhengjie Zhu, Xingyu Feng, Huitian Guo, Lianyou Tang, Jinshuai Zhang, Xiang He, Qin Fei, Cao Yu, Jian Zhou, Yi Cui, and Jixian Xu

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ACS Materials Letters
DOI: 10.1021/acsmaterialslett.4c01687
22 Oct 03:41

Improved Operational Stability of Blue Phosphorescent OLEDs by Functionalizing Phenyl‐Carbene Groups of Tetradentate Pt(II) Complexes

by Guijie Li, Lydia Ameri, Blake Dorame, Zhi‐Qiang Zhu, Jian Li
Improved Operational Stability of Blue Phosphorescent OLEDs by Functionalizing Phenyl-Carbene Groups of Tetradentate Pt(II) Complexes

Efficient and stable deep blue phosphorescent OLEDs are developed employing N-heterocyclic carbene (NHC)-based tetradentate Pt(II) complexes as emitters. PtON5N-dtb-based device shows narrow emission spectrum with full-width at half maximum (FWHM) of 30 nm, demonstrates a peak external quantum efficiency (EQE) of 20.4%, and achieves an estimated operational lifetime LT90 of 85 h at an initial brightness of 1000 cd m−2.


Abstract

Stable and efficient deep-blue organic light-emitting diodes (OLEDs) are in high demand for display and lighting applications but are rarely reported due to their poor operational lifetimes. Herein, the study designs and synthesizes two novel N-heterocyclic carbene (NHC)-based tetradentate Pt(II) complexes PtON5-dtb and PtON5N-dtb, and thoroughly investigate their electrochemical and photophysical properties. Functionalization of the NHC moieties can increase the metal-to-ligand charge transfer (1/3MLCT) characters in their lowest triplet excited-states, resulting in significantly shortened photoluminescent lifetimes and remarkably improved device performance. A deep blue OLED employing PtON5N-dtb as an emitter exhibits a narrow spectral bandwidth with a full-width at half maximum (FWHM) of 30 nm and a CIEy value of 0.17 and demonstrates a maximum external quantum efficiency (EQE) of 20.4% with a small efficiency roll-off, which maintains a high EQE of 18.5% at 1000 cd m−2. Moreover, the deep blue OLED also realizes a long-measured operational lifetime LT90 (time to 90% of the initial luminance) of 71 hours with an initial brightness of 1134 cd m−2, corresponding to an estimated device lifetime LT90 of 85 h at 1000 cd m−2. This represented an eightfold lifetime improvement for PtON5N-dtb-based deep blue OLED compared to PtON7-dtb in the same device setting.

22 Oct 03:10

[ASAP] Suppressed Thermal Quenching via Tetrafluoroborate-Induced Surface Reconstruction of CsPbBr3 Nanocrystals for Efficient Perovskite Light-Emitting Diodes

by Min-Gi Jeon, Gwang Hwi An, Artavazd Kirakosyan, Subin Yun, Joonseok Kim, Chang-Yeon Kim, Hyun Seok Lee, and Jihoon Choi

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ACS Nano
DOI: 10.1021/acsnano.4c10320
22 Oct 03:09

[ASAP] Supersaturated Antisolvent-Assisted Crystallization for Highly Efficient Inorganic Perovskite Light-Emitting Diodes

by Bong Woo Kim and Sang Hyuk Im

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ACS Nano
DOI: 10.1021/acsnano.4c06465
22 Oct 03:04

[ASAP] Regulation of the Buried Interface to Achieve Efficient HTL-Free All-Inorganic CsPbI2Br-Based Perovskite Solar Cells

by Tong Yun, Hengzhuo Cai, Wanyang Lyu, Xubing Lu, Xingsen Gao, Jun-Ming Liu, and Sujuan Wu

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ACS Applied Materials & Interfaces
DOI: 10.1021/acsami.4c13156
22 Oct 03:04

[ASAP] Dibenzothiophene S, S-Dioxide-Containing Dipolar Molecules As Efficient Hole-Transport Materials for p-i-n Perovskite Solar Cells

by Junjie Zhou, Lei Chen, Zijun Ma, Xiwei Liao, Yujing Yan, Ziyin Chen, Yuhang Yang, Rui Wang, Wei Yu, Yichen Wang, Xiaoting Nie, Pengyun Huo, Xiang Fang, Jing Zhang, Yi Zhou, Bo Song, and Ningyi Yuan

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ACS Applied Materials & Interfaces
DOI: 10.1021/acsami.4c12783
22 Oct 03:02

[ASAP] High-Voltage Stable Perovskite Light-Emitting Diodes Enabled by an Optoelectric-Tunable Sandwiched Nanostructure

by Lin Wang, Ting Zhang, Chengxi Zhang, Xiaofei Zhang, Lingmei Kong, Sheng Wang, Lingjiao Zhang, Chuan Liu, Baiquan Liu, Yanbo Li, Qianqian Lin, Yongbiao Zhao, Jiaqi Zhang, Wenxu Yin, Xiao Wei Sun, Xiaoyu Zhang, and Xuyong Yang

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ACS Applied Materials & Interfaces
DOI: 10.1021/acsami.4c14525
22 Oct 03:01

[ASAP] Reaction Dynamics between Formamidinium Lead Iodide and Copper Oxide

by Katarzyna Gawlińska−Nęcek, Małgorzata Kot, Zbigniew Starowicz, Marta Janusz-Skuza, Piotr Panek, Ludwig Marth, Paul Plate, and Jan Ingo Flege

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ACS Applied Materials & Interfaces
DOI: 10.1021/acsami.4c12990
22 Oct 02:51

Novel Green Solvent for Sustainable Fabrication of Quasi‐2D Perovskite Solar Cells

by L. Andrés Guerrero‐León, José Roberto Bautista‐Quijano, Herman Heffner, Vladimir Shilovskikh, Raquel Campos, Boris Rivkin, Yana Vaynzof
Novel Green Solvent for Sustainable Fabrication of Quasi-2D Perovskite Solar Cells

Glycerol formal is reported as a green solvent for processing efficient and stable quasi-2D (n = 5) metal halide perovskite solar cells.


Abstract

Despite the remarkable advances in the field of perovskite photovoltaics, the use of toxic solvents for their fabrication poses a significant challenge to their scale-up and commercialization. The vast majority of studies rely on using the highly hazardous N, N-Dimethylformamide (DMF), with green alternatives remaining scarce. In this work, the use of glycerol formal (Gly-F) is reported as a green solvent for fabricating quasi-2D (n = 5) perovskite solar cells. Quasi-2D perovskite films processed from Gly-F exhibit a high degree of uniformity and a compact microstructure. When integrated into solar cells, the green solvent-processed films reach a promising power conversion efficiency of 14.53%. This performance is lower than that of DMF-based perovskites, most likely due to the presence of laterally oriented low n perovskite phases. Interestingly, while the performance of DMF-based devices is rather irreproducible, the performance of Gly-F-based devices is robust and consistent. These results demonstrate the potential of Gly-F- as a promising green alternative to DMF.

22 Oct 02:50

Tailoring Ultra‐Narrowband Tetraborylated Multiple Resonance Emitter for High‐Performance Blue OLED

by Wenbo Yuan, Qian Jin, Mingxu Du, Lian Duan, Yuewei Zhang
Tailoring Ultra-Narrowband Tetraborylated Multiple Resonance Emitter for High-Performance Blue OLED

Here, a novel “short-range charge-transfer region regulation” design strategy is proposed toward the goal of ultra-narrowband blue emitters. The corresponding device exhibits leading performance for pure-blue OLEDs, with excellent efficiencies of 36.4%, 49.1 cd A−1, and 51.4 lm W−1, a record high luminescence of 9.0 × 105 cd m−2, an ultra-small FWHM of 15 nm and a CIEy coordinate of 0.20.


Abstract

Ultra-narrowband multiple resonance (MR) emitters are a key component in the fabrication of highly efficient and stable blue organic light-emitting diodes (OLEDs). To explore the theoretical boundaries of wavelength and full width at half maximum (FWHM) in blue emitters, the currently narrowest boron-based MR emitter is carefully designed by integrating the superior v-DABNA and BBCz-DB structures under the auspices of the ingenious short-range charge-transfer region regulation strategy. The target tetraboron compound TB-PB demonstrates a blue emission with an emission maximum of 473 nm, a small FWHM of 12 nm and a CIEy coordinate of 0.14. Benefiting from the emitter's high photoluminescence quantum yield (99%), low excited-state energy (2.74 eV) and short delayed fluorescence lifetime (0.53 µs), the corresponding OLED achieves exceptional efficiencies of 36.4%, 49.1 cd A−1, and 51.4 lm W−1 with a record-high luminescence of 9.0 × 105 cd m−2, an ultra-narrow FWHM of 15 nm and a CIEy coordinate of 0.20. These breakthroughs will accelerate the development of next-generation blue emitters and lead to the advancement of OLED technology.

22 Oct 02:46

The Combination of a Donor–Acceptor TADF and a MR‐TADF Emitting Core Results in Outstanding Electroluminescence Performance

by Dongyang Chen, Hui Wang, Dianming Sun, Sen Wu, Kai Wang, Xiao‐Hong Zhang, Eli Zysman‐Colman
The Combination of a Donor–Acceptor TADF and a MR-TADF Emitting Core Results in Outstanding Electroluminescence Performance

The ToC illustrates the molecular structure of DtCzBN-CNBT2 along with a brief overview of the performance of the corresponding OLED. The green and blue-colored moieties represent the MR-TADF emitting core and the pendant D–A TADF shield, respectively.


Abstract

Here the utility and potential of an emitter design are demonstrated, consisting of a narrowband-emitting multiresonant thermally activated delayed fluorescent (MR-TADF) core that is decorated with a suitably higher energy donor-acceptor TADF moiety. Not only does this D–A TADF group offer additional channels for triplet exciton harvesting and confers faster reverse intersystem crossing (RISC) kinetics but it also acts as a steric shield, insulating the emissive MR-TADF core from aggregation-caused quenching. Two emitters, DtCzBN-CNBT1 and DtCzBN-CNBT2, demonstrate enhanced photophysical properties leading to outstanding performance of the organic light-emitting diodes (OLEDs). DtCzBN-CNBT2, containing a D–A TADF moiety, has a faster k RISC (1.1 × 105 s−1) and higher photoluminescence quantum yield (Φ PL: 97%) compared to DtCzBN-CNBT1 (0.2 × 105 s−1, Φ PL: 90%), which contains a D–A moiety that itself is not TADF. The sensitizer-free OLEDs with DtCzBN-CNBT2 achieve a record-high maximum external quantum efficiency (EQEmax) of 40.2% and showed milder efficiency roll-off (EQE1000 of 20.7%) compared to the DtCzBN-CNBT1-based devices (EQEmax of 37.1% and EQE1000 of 11.9%).

22 Oct 02:45

Enhanced Electric Field Minimizing Quasi‐Fermi Level Splitting Deficit for High‐Performance Tin‐Lead Perovskite Solar Cells

by Jiahui Cheng, Huijie Cao, Shuming Zhang, Jie Shao, Wenjian Yan, Cheng Peng, Fang Yue, Zhongmin Zhou
Enhanced Electric Field Minimizing Quasi-Fermi Level Splitting Deficit for High-Performance Tin-Lead Perovskite Solar Cells

β-poly(1,1-difluoroethylene) as a ferroelectric polymer dipole is introduced into Sn–Pb perovskite to enhance the built-in electric field and promote the charge transfer at perovskite/electron transport layer interface, which effectively suppresses non-radiative recombination and reduces the interfacial quasi-Fermi Level Splitting deficit. The resultant Sn–Pb perovskite solar cells achieve a champion efficiency of 23.44%, along with enhanced long-term stability.


Abstract

The quasi-Fermi level splitting (QFLS) deficit caused by the non-radiative recombination at the interface of perovskite/electron transport layer (ETL) can lead to severe open-circuit voltage (V OC) loss and thus decreases the efficiency of perovskite solar cells (PSCs), however, has received limited attention in inverted tin-lead PSCs. Herein, the strategy of constructing an extra-electric field is presented by introducing ferroelectric polymer dipoles (FPD)-β-poly(1,1-difluoroethylene)-to suppress the QFLS deficit. The directional polarization of FPD can enhance the built-in electric field (BEF) and thus promote the charge transfer at the perovskite/ETL interface, which effectively suppresses non-radiative recombination. Furthermore, the incorporation of FPD facilitates high-quality crystallization of perovskite and reduces the surface energetic disorder. Therefore, the QFLS deficit in the perovskite/ETL half-stacked device is reduced from 62 to 27 meV after incorporating FPD, and the optimized device achieves an efficiency of 23.44% with a high V OC of 0.88 V. Additionally, the addition of FPD increases the activation energy for ion migration, which can reduce the effect of ion migration on the long-term stability of the device. Consequently, the FPD-incorporated device retains 88% of the initial efficiency after 1100 h of continuous illumination at the maximum power point (MPP).

22 Oct 02:39

Achieving High Doping Density in pH‐neutral Conjugated Polyelectrolyte Toward Effective Hole‐Transporting Materials for Organic Solar Cells

by Jiayu Li, He Wang, Yao Tong, Zhe Li, Zhengrong Wei, Yuan Cheng, Cunbin An, Bowei Xu
Achieving High Doping Density in pH-neutral Conjugated Polyelectrolyte Toward Effective Hole-Transporting Materials for Organic Solar Cells

A series of pH-neutral conjugated polyelectrolytes with high doping density are designed and synthesized as hole-transporting layer materials. The high doping density of PTT-F:POM is proved to significantly decrease the depletion region width at the anode interface, which minimized the energy loss in hole transport. Consequently, a binary organic solar cell modified by PTT-F:POM achieved a high PCE of 18.8%.


Abstract

The lack of effective and non-corrosive hole-transporting layer (HTL) materials has remained a long-standing issue that severely restricts the performance of organic solar cells (OSCs). Most pH-neutral conjugated polyelectrolytes (CPEs) exhibit inferior performance to the acid-doped HTL materials due to their low doping density. In this study, a series of pH-neutral CPEs is designed and synthesized with high doping density as HTL materials. Through an elaborate synthetic route, two sulfonate-terminating alkoxyl side chains can be introduced into thiophene, by which the electron-rich, highly soluble, and chemically stable thiophene monomer is synthesized to enable the subsequent polymerization. The CPE PTT-F exhibit a remarkable self-doping property with an enhanced doping density from 2.01 × 1017 to 7.02 × 1018 cm−3. The high work function and the increased doping density of PTT-F-based HTL decrease the depletion region width from 38.4 to 8.1 nm at the anode interface, which minimized the energy loss in hole transport. Consequently, a binary OSC modified by PTT-F-based HTL achieve a high PCE of 18.8%. To the best of the knowledge, this is the highest PCE for OSC employing CPE-based HTL. The results from this work demonstrate an encouraging achievement of realizing exceptional hole collection ability in pH-neutral CPEs.

22 Oct 02:38

Tetrahydrofuran Processable Organic Solar Cells with 19.45% Efficiency Realized by Introducing High Molecular Dipole Unit Into the Terpolymer

by Chentong Liao, Xiaopeng Xu, Tongyan Yang, Wuke Qiu, Yuwei Duan, Ruipeng Li, Liyang Yu, Qiang Peng
Tetrahydrofuran Processable Organic Solar Cells with 19.45% Efficiency Realized by Introducing High Molecular Dipole Unit Into the Terpolymer

Incorporating dithienophthalimide unit with high dipole moment into PM6 main chain, endows the designed terpolymers with good tetrahydrofuran processability and enhanced crystallinity, resulting in high PCEs of 18.79% and 19.45% for tetrahydrofuran processable binary and ternary blend OSCs.


Abstract

Developing organic solar cells (OSCs) processable with halogen-free, non-aromatic solvents is crucial for practical applications, yet challenging due to the limited solubility of most photoactive materials. This study introduces high-performance terpolymers processable in tetrahydrofuran (THF) by incorporating dithienophthalimide (DPI) into the PM6 backbone. DPI extends the absorption band, lowers HOMO levels, and improves THF solubility and film crystallinity through its large dipole moment effect. Optimal PBD-10:L8-BO devices processed with THF achieved a competitive power conversion efficiency (PCE) of 18.79%, approaching chloroform-processed devices (19.04%). By introducing PBTz-F as a second donor, ternary OSCs reached an impressive 19.45% PCE when processed with THF. This improvement stems from enhanced photon generation, improved morphology, better charge transport, longer exciton lifetimes, efficient charge dissociation and collection, and suppressed recombination. These PCEs of 18.79% and 19.45% for binary and ternary blend OSCs, respectively, represent the highest reported efficiencies for OSCs processed with halogen-free, non-aromatic solvents. This work demonstrates significant progress in eco-friendly OSC fabrication, paving the way for more sustainable and commercially viable organic photovoltaic technologies.

22 Oct 02:37

Hetero‐Nucleation Induced [111]‐Oriented Mixed Halide Perovskite for Stable Pure Red Light‐Emitting Diodes

by Yong‐Hui Song, Xiao‐Lin Tai, Guan‐Jie Ding, Zhen‐Yu Ma, Jing‐Ming Hao, Kuang‐Hui Song, Ya‐Lan Hu, Shikuo Li, Yue Lin, Hong‐Bin Yao
Hetero-Nucleation Induced [111]-Oriented Mixed Halide Perovskite for Stable Pure Red Light-Emitting Diodes

A hetero-nucleation crystallization strategy is reported to grow [111]-orientation CsPbI3-xBrx thin films. Remarkably, the [111]-orientation preferred film exhibits lower halide ion migration possibility and lower defect states than that of [001]-oriented film, resulting in efficient and stable mixed-halide pure red LEDs.


Abstract

Mixed halide 3D perovskites are promising for bright, efficient, and wide-color gamut light-emitting diodes (LEDs) due to their excellent carrier transport, high luminescence, and easily tunable bandgaps. However, serious halide ion migration inside mixed halide 3D perovskite results in poor operational and spectral stability of the as-fabricated LEDs. Here, a hetero-nucleation crystallization strategy is reported to grow [111]-orientation preferred mixed halide 3D perovskite CsPbI3-xBrx thin films for stable pure red LEDs. This hetero-nucleation crystallization is enabled by the addition of phosphoric acid (H3PO4) complexation, which promotes the growth of small perovskite grains into large grains with uniform [111]-orientation. The obtained [111]-orientation preferred film exhibits excellent stability under light or electric field stimulus as revealed by model analysis and experimental results compared to that of [001]-orientation preferred film. Thus, based on the [111]-orientation preferred film, the fabricated LED exhibits an external quantum efficiency of 22.8%, a maximum brightness of 12 000 cd m−2, and a half-life time of 4080 min under 1.5 mA cm−2. More importantly, the electroluminescence spectrum of the device remains stable during the continuous operation of 4080 min, showcasing the significant spectral stability improvement enabled by the hetero-nucleation induced [111]-orientation strategy.

22 Oct 02:36

Internal Capsulation Via Self‐Cross‐linking and π‐Effects Achieves Highly Stable Perovskite Solar Cells

by Zongzhi Yang, Yuling Zhang, Guangzheng Wu, Shuang Li, Zhangwei He, Miaoning Ou, Haoyu Yuan, Shuai Li, Han Zhu, Runnan Yu, Zhan'ao Tan
Internal Capsulation Via Self-Cross-linking and π-Effects Achieves Highly Stable Perovskite Solar Cells

This work proposes an internal encapsulation strategy utilizing the synergistic effect of in situ cross-linking and π-effects, achieving an upgrade of the protective layer from linear to mesh-like coverage. The internal encapsulated device exhibits an enhanced efficiency of 25.31 % and noticeably improved stability.


Abstract

Pursuing high stability becomes the core challenge in realizing the widespread application of perovskite solar cells (PerSCs). Here, a practical internal-capsulation strategy is proposed by introducing cross-linkable methacrylate analogs upon the perovskite layer, hindering ion migration and preventing lead leakage to achieve stable PerSCs. Butyl methacrylate (UMA) and benzyl methacrylate (BMA) can chemically interact with the perovskite layer, especially for the BMA dimer with significant π-interactions among the hanging benzene rings. Such configuration facilitated more compact coordination, thereby restoring the Fermi level of perovskite to a defect-free state and reducing carrier recombination losses. Moreover, by integrating the self-cross-linking and intermolecular π-effect, the application of BMA upgraded the internal capsulation from linear protection to a compact mesh-like scale. Consequently, the application of BMA not only boosted the efficiency to 25.31% but also greatly enhanced the stability of the perovskite layer, especially for water resistance and preventing lead linkage. The internal capsulation strategy upgrading from linear to mesh-like marked an innovative direction in protecting the perovskite layer, paving the way for more sustainable PerSCs in further application.

22 Oct 02:32

On the VOC loss in NiO-based inverted metal halide perovskite solar cells

Mater. Adv., 2024, 5,8652-8664
DOI: 10.1039/D4MA00873A, Paper
Open Access Open Access
Creative Commons Licence&nbsp This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
Kousumi Mukherjee, Denise Kreugel, Nga Phung, Cristian van Helvoirt, Valerio Zardetto, Mariadriana Creatore
This study assesses the effect of key NiO properties, especially resistivity and surface energy, on the device's performance.
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21 Oct 02:26

Silicon-based peripheral steric donor modifications for a high-efficiency multi-resonance thermally activated delayed fluorescence emitter

J. Mater. Chem. C, 2024, 12,18725-18731
DOI: 10.1039/D4TC04002C, Paper
Hai-Tian Yuan, Yue-Jian Yang, Zhe-Hong Yu, Qi Zheng, Hong-Yan Yan, Yu Wang, Dong-Ying Zhou, Liang-Sheng Liao, Zuo-Quan Jiang
Multi-resonance thermally activated delayed fluorescence (MR-TADF) emitters have broad applications in organic light-emitting diodes (OLEDs).
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21 Oct 02:26

The modulation acceptor of covalent organic frameworks: the optimization of intramolecular and interfacial charge transfer processes

J. Mater. Chem. C, 2024, 12,19094-19102
DOI: 10.1039/D4TC03254C, Paper
Ziang Song, Yujun Xie, Xiaojuan Song, Jianing Tang, Jinfeng Wang, Ben Zhong Tang, Zhen Li
Three photoactive COFs containing different acceptors (BO, BT, and BSe) were designed and synthesized. The modulation of acceptors has optimized the intramolecular/interfacial charge transfer processes and improved the photocatalytic performance.
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21 Oct 02:25

Thienoimidazole-pyridine based small molecule hole transport materials for dopant-free, efficient inverted perovskite solar cells

J. Mater. Chem. C, 2024, 12,19163-19169
DOI: 10.1039/D4TC03250K, Paper
Suri Babu Akula, Yogesh S. Tingare, Chaochin Su, Chen-Yun Hsu, Hong-Jia Lin, Chien-Hsiang Lin, Mu-Yi Lin, Ja-Hon Lin, Zhi-Ting Wu, Chong-Wei Wu, Chi-Ruei Guo, Wen-Ren Li
A new hole-transporting material based on heterocyclic thienoimidazole-pyridine is synthesized for perovskite solar cells with an 18.77% efficiency.
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21 Oct 02:25

Self-powered, low-dark-current, high-detectivity CsPbBr3 nanowire photodetectors with excellent weak-light detection ability

J. Mater. Chem. C, 2024, 12,19156-19162
DOI: 10.1039/D4TC03419H, Paper
Boao Xiao, Shuiguo Wen, Jianqiang Zhang, Zheng Gao, Yapeng Tang, Dingjun Wu, Jiang Zhao, Hai Zhou
1-octyl-3-methylimidazolium hydrogen sulfate (OMIMHSO4) is introduced into CsPbBr3 nanowires for defect passivation, resulting in the corresponding nanowire photodetector with a minimum response light intensity as low as 1.14 × 10−10 W cm−2.
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21 Oct 02:22

Down-converting ultraviolet light using a conductive passivator to enhance the efficiency and stability of perovskite solar cells

J. Mater. Chem. A, 2024, 12,29571-29579
DOI: 10.1039/D4TA05782A, Paper
Honglei Yu, Zhengyan He, Xiangheng Liu, Zhiqiang Zhang, Yongjia Li, Shufang Zhang, Qi Zhang, Changlin Yao, Hai Zhong
DSDA simultaneously down-converts ultraviolet light and enhances the conductivity of SnO2; DSDA effectively passivates defects at the SnO2/perovskite interface while providing in situ protection against lead leakage.
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21 Oct 02:21

A–π–A type quasi-macromolecular acceptors with molecular conjugation length control strategy for high-performance organic solar cells

J. Mater. Chem. A, 2024, 12,31581-31588
DOI: 10.1039/D4TA05543H, Paper
Siqing He, Changhao Xiang, Wei Liu, Songting Liang, Rui Zhang, Weikun Chen, Bin Zhao, Jun Yuan, Yingping Zou
Utilizing a molecular conjugation length control strategy to modify A–π–A type quasi-macromolecule acceptors. An optimal π-bridge length results in an upshifted LUMO level and favorable nanoscale phase separation.
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21 Oct 02:20

Probing the key roles of the back interface in the performance of carbon-based hole-transport-layer free perovskite solar cells

J. Mater. Chem. A, 2024, 12,30388-30397
DOI: 10.1039/D4TA06143H, Paper
Xinwei Li, Nianqing Fu, Xiaocao Peng, Hehui Lin, Jiaang Cheng, Ziming Chen, Peng Lin, Jun Du
The key roles of perovskite films in the photovoltaic performance of carbon-based PSCs employing various absorbers were comprehensively studied and elucidated.
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21 Oct 02:20

Asymmetric liquid crystalline donors with two different end groups enable efficient all-small-molecule organic solar cells

J. Mater. Chem. A, 2024, 12,31163-31172
DOI: 10.1039/D4TA06126H, Paper
Chenhe Wang, Tianyi Chen, Shuixing Li, Yecheng Shen, Jinyang Yu, Adiljan Wupur, Yongmin Luo, Mengting Wang, Xiukun Ye, Jiaying Wu, Minmin Shi, Hongzheng Chen
The relationships among molecular structure, liquid crystal behavior, and phase separation morphology of small molecule donors were explored. The BT-CAR4-based device achieved an ideal morphology, leading to a 15.52% efficiency for binary ASM-OSCs.
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21 Oct 02:20

Crystallization kinetic engineering for growth of thin metal halide perovskite platelets

J. Mater. Chem. A, 2024, Advance Article
DOI: 10.1039/D4TA05462H, Paper
Dong Ding, Bo Zhou, Xiaoteng Li, Jiaqi Duan, Kaiyan Wu, Bin Hou, Honglei Fan, Hongliang Liu, Lei Jiang
Thin Cs2AgBiBr6 platelets possessing optimized optical and photo-response properties are obtained via a crystallization kinetic regulation strategy.
To cite this article before page numbers are assigned, use the DOI form of citation above.
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21 Oct 02:18

A three-dimensional lead iodide perovskite analog featuring hydrogen-bonded dual monovalent cations

Chem. Sci., 2024, 15,18455-18462
DOI: 10.1039/D4SC05585C, Edge Article
Open Access Open Access
Wei Wang, Cheng-Dong Liu, Chang-Chun Fan, Wen Zhang
A 3D perovskite analog is constructed by using hydrogen bond to reduce electrostatic repulsion of two monovalent cations. The study highlights the potential to overcome cation selection limitations on novel 3D perovskite-like materials.
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21 Oct 02:16

MR-TADF liquid crystals: towards self assembling host–guest mixtures showing narrowband emission from the mesophase

Chem. Sci., 2024, 15,18022-18030
DOI: 10.1039/D4SC04429K, Edge Article
Open Access Open Access
Creative Commons Licence&nbsp This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
Julius A. Knöller, Franziska Müller, Tomas Matulaitis, John M. dos Santos, Abhishek Kumar Gupta, Eli Zysman-Colman, Sabine Laschat
We developed a MR-TADF based, columnar liquid crystalline host system and doped it with a MR-TADF guest. Efficient FRET allowed us to construct the first columnar liquid crystal with narrowband MR-TADF from the strongly aggregated mesophase.
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21 Oct 02:14

Enhancing inter-domain connectivity by reducing fractal dimensions: the key to passivating deep traps in organic photovoltaics

Energy Environ. Sci., 2024, 17,8893-8903
DOI: 10.1039/D4EE02961E, Paper
Yuang Fu, Luhang Xu, Yuhao Li, Emily J. Yang, Yu Guo, Guilong Cai, Pok Fung Chan, Yubin Ke, Chun-Jen Su, U-Ser Jeng, Philip C. Y. Chow, Ji-Seon Kim, Man-Chung Tang, Xinhui Lu
Researchers in CUHK identified isolated non-fullerene acceptor (NFA) domains as the morphological origin of deep electron traps in organic photovoltaics. They showcased effective trap passivation by reducing the fractal dimensions of NFA networks.
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