04 Nov 06:59
by Shixiu Sun,
Cuilin Tan,
Zijian Zhang,
Hang Zhou,
Wenjing Xu,
Yujie Xu,
Xiaoyan Du,
Sang Young Jeong,
Han Young Woo,
Fujun Zhang,
Chao Zhang,
Qianqian Sun
The introduction of BTP-eC9 prolongs the nucleation and crystallization process of acceptor and donor molecules, which enhances the order of molecular arrangement of the active layer. Meanwhile, the nucleation and crystallization time of the donor is earlier than that of the acceptor, which promotes the formation of better vertical structural phase separation.
Abstract
The morphology of the active layer is crucial for highly efficient organic solar cells (OSCs), which can be regulated by selecting a rational third component. In this work, the highly crystalline nonfullerene acceptor BTP-eC9 is selected as the morphology regulator in OSCs with PM6:BTP-BO-4Cl as the main system. The addition of BTP-eC9 can prolong the nucleation and crystallization progress of acceptor and donor molecules, thereby enhancing the order of molecular arrangement. Meanwhile, the nucleation and crystallization time of the donor is earlier than that of the acceptors after introducing BTP-eC9, which is beneficial for obtaining a better vertical structural phase separation. The exciton dissociation, charge transport, and charge collection are promoted effectively by the optimized morphology of the active layer, which improves the short-circuit current density and filling factor. After introducing BTP-eC9, the power conversion efficiencies (PCEs) of the ternary OSCs are improved from 17.31% to 18.15%. The PCE is further improved to 18.39% by introducing gold nanopyramid (Au NBPs) into the hole transport layer to improve photon utilization efficiency. This work indicates that the morphology can be optimized by selecting a highly crystalline third component to regulate the nucleation and crystallization progress of the acceptor and donor molecules.
04 Nov 06:56
by Zhangyu Cao,
Le Ju,
Binbin Wei,
Suofu Wang,
Yanwei Wu,
Tao Han,
Xiangfei Wei,
Wenhui Wang,
Feng Li,
Lei Shan,
Mingsheng Long
High-sensitive, fast speed, uncooled MWIR detector based on TiS3 nanoribbon is demonstrated. The exciting experimental results include a high R of 21.1 AW−1, impressive specific detectivity D* of 5.9 × 1010 cmHz1/2 W−1, and with τ
r = 1.3 ms and τ
d = 1.5 ms in the MWIR spectrum range. This find promotes the development of uncooled MWIR photodetectors with fast speed.
Abstract
High-sensitive uncooled mid-wave infrared (MWIR) photodetection with fast speed is highly desired for biomedical imaging, optical communication, and night vision technology. Low-dimensional materials with low dark current and broadband photoresponse hold great promise for use in MWIR detection. Here, this study reports a high-performance MWIR photodetector based on a titanium trisulfide (TiS3) nanoribbon. This device demonstrates an ultra-broadband photoresponse ranging from the visible spectrum to the MWIR spectrum (405–4275 nm). In the MWIR spectral range, the photodetector achieves competitive high photoresponsivity (R) of 21.1 A W−1, and an impressive specific detectivity (D*) of 5.9 × 1010 cmHz1/2 W−1 in ambient air. Remarkably, the photoresponse speed in the MWIR with τ
r = 1.3 ms and τ
d = 1.5 ms is realized which is much faster than the thermal time constant of 15 ms. These findings pave the way for highly sensitive, room-temperature MWIR photodetectors with exceptionally fast response speed.
04 Nov 06:07
by Haixin Lei, Yu Xu, Yao Zhang, Qingjie Feng, Hongzhi Zhou, Wei Tang, Jiaoyang Wang, Linjun Li, Guangjun Nan, Weigao Xu, and Haiming Zhu
ACS Nano
DOI: 10.1021/acsnano.4c12132
04 Nov 05:42
by Xiang Feng,
Yueyue Gao,
Xiufang Huang,
Jiantao Wang,
Cheng Dong,
Gentian Yue,
Furui Tan,
Stefaan De Wolf
The P3HT hole transport layer (HTL) featuring preferable three-dimension molecular orientation is realized via optimizing its preparation process. The preferable molecular orientation of P3HT HTL imparts improved electronic properties, enhanced moisture-repelling capability, intensified defect passivation, and matched energy level. The small-area (0.04 cm2) and large-area (1 cm2) carbon-electrode devices deliver notable efficiency of 20.55% and 18.32% with desirable stability.
Abstract
Carbon-based perovskite solar cells (PSCs) coupled with solution-processed hole transport layers (HTLs) have shown potential owing to their combination of low cost and high performance. However, the commonly used poly(3-hexylthiophene) (P3HT) semicrystalline-polymer HTL dominantly shows edge-on molecular orientation, in which the alkyl side chains directly contact the perovskite layer, resulting in an electronically poor contact at the perovskite/P3HT interface. The study adopts a synergetic strategy comprising of additive and solvent engineering to transfer the edge-on molecular orientation of P3HT HTL into 3D molecular orientation. The target P3HT HTL possesses improved charge transport as well as enhanced moisture-repelling capability. Moreover, energy level alignment between target P3HT HTL and perovskite layer is realized. As a result, the champion devices with small (0.04 cm2) and larger areas (1 cm2) deliver notable efficiencies of 20.55% and 18.32%, respectively, which are among the highest efficiency of carbon-electrode PSCs.
04 Nov 05:41
by Qing Shen,
Chengliang He,
Shuixing Li,
Jiawei Qiao,
Shilin Li,
Yuan Zhang,
Minmin Shi,
Lijian Zuo,
Xiaotao Hao,
Hongzheng Chen
To clarify the key property responsible for further improved efficiency, the material properties of acceptors are comprehensively scanned. As a result, exciton delocalization capability of BTP-H5 is two times over PC71BM, and efficiency is improved from 40% of S-Q limit for PC71BM-based OSC to 60% for BTP-H5-based one, which achieved an efficiency of 19.07%, among the highest for binary OSCs.
Abstract
In organic solar cells (OSCs), electron acceptors have undergone multiple updates, from the initial fullerene derivatives, to the later acceptor-donor-acceptor type non-fullerene acceptors (NFAs), and now to Y-series NFAs, based on which efficiencies have reached over 19%. However, the key property responsible for further improved efficiency from molecular structure design is remained unclear. Herein, the material properties are comprehensively scanned by selecting PC71BM, IT-4F, and L8-BO as the representatives for different development stages of acceptors. For comparison, asymmetric acceptor of BTP-H5 with desired loosely bounded excitons is designed and synthesized. It's identified that the reduction of intrinsically exciton binding energy (E
b) and the enhancement of exciton delocalization capability act as the key roles in boosting the performance. Notably, 100 meV reduction in E
b has been observed from PC71BM to BTP-H5, correspondingly, electron-hole pair distance of BTP-H5 is almost two times over PC71BM. As a result, efficiency is improved from 40% of S-Q limit for PC71BM-based OSC to 60% for BTP-H5-based one, which achieves an efficiency of 19.07%, among the highest values for binary OSCs. This work reveals the confirmed function of exciton delocalization capability quantitatively in pushing the efficiency of OSCs, thus providing an enlightenment for future molecular design.
04 Nov 05:39
by Murat Ebic,
Faranak Sadegh,
Muhammad Ans,
Daniel Prochowicz,
Pankaj Yadav,
Soumitra Satapathi,
Seckin Akin
Calculation and experimental results corroborate that the strategic incorporation of 1-butyl-3-methylimidazolium thiocyanate (BmimSCN) resulted in a remarkable enhancement of intrinsic charge transport properties, effective passivation of defects and trap states, and a tunable bandgap, leading to improved optoelectronic characteristics. The altered electronic structure influences crystallization kinetics, resulting in larger, higher-quality crystalline grains and superior photovoltaic performance with a champion power conversion efficiency (PCE) of 15.2%.
Abstract
This study delves into the innovative approach of enhancing the efficiency and stability of all-inorganic perovskite solar cells (I-PSCs) through the strategic incorporation of thiocyanate (SCN−) ions via pseudohalide-based ionic liquid (IL) configurations. This straightforward methodology has exhibited captivating advancements in the kinetics of crystallization as well as the optoelectronic characteristics of the resulting perovskite films. These developments hold the promise of enhancing not only the quality and uniformity of the films but also aspects such as band alignment and the efficacy of charge transfer mechanisms. Calculation results corroborate that the incorporation of 1-butyl-3-methylimidazolium thiocyanate (BmimSCN) led to a significant redistribution of electron state density and enhanced electron-donating properties, indicating a substantial electron transfer between the perovskite material and the IL. Notably, the engineered devices demonstrate a remarkable efficiency surpassing 15%, a substantial enhancement attributed to the synergistic effects of the SCN− ion. Additionally, this approach offers inherent stability benefits, thereby addressing a significant challenge in I-PSC technology. This IL maintains >90% of the initial efficiency after 600 h, while the control device decreased to <20% of its initial value after only 100 h. 1-butyl-3-methylimidazolium iodide (BmimI) is also employed to further investigate the effects of SCN− ions on device performance.
04 Nov 05:37
by Mehdi Rohullah,
Melchi Chosenyah,
Avulu Vinod Kumar,
Rajadurai Chandrasekar
The fabrication of intelligent systems that make decisive decisions is necessary for the development of smart technologies. This work emphasizes the construction of organic crystal-waveguide-based spiral waveguides producing discriminatory pathways. These organic spiral waveguides are, in turn, employed to demonstrate smart-decision-making organic photonic circuits.
Abstract
In the era of artificial intelligence, developing advanced and intelligent photonic circuits has become essential. In this work, the fabrication of a smart organic photonic circuit (OPC), is illustrated which utilizes a Cornu-spiral-like waveguide (CSW) to produce discriminating optical pathways in the circuit. The mechanical flexibility of Schiff base, (E)-1-(((5-iodopyridin-2-yl)imino)methyl)naphthalen-2-ol (IPyIN) facilitates the fabrication of a first-of-its-kind, two-ring-based CSW via the atomic force microscopy cantilever tip-assisted mechanophotonics approach. The photonic studies suggest that the CSW structure routes optical signals in discriminating trajectories. To capitalize on the discriminatory properties of the CSW, two linear waveguides onto both rings of the CSW are integrated to create a smart OPC. This smart OPC can selectively route optical signals either partially or fully in the circuit, depending on the pathways determined by the CSW, thus enabling the circuit to switch ON or OFF. Such intelligent photonic circuits are essential for advancing smart technologies.
04 Nov 05:36
by Yongsheng Zhang,
Jincheng Wang,
Xiaoyan He,
Shilin Peng,
Lei Yuan,
Gang Huang,
Yongjin Guo,
Xiuhong Lu
A novel example of alcohol deoxycyclopropanation reaction for cyclopropane introduction with organophotocatalyst is described. This method demonstrates a broad substrate scope and high transformation efficiency. The mechanism involves the activation of alcohols in situ along with a photoredox-catalyzed deoxygenative radical addition–polar cyclization. The direct introduction of cyclopropane to marketed drugs and natural products is also explored.
Abstract
Cyclopropane fragments, which widely exist in marketed drugs and natural products, can confer special pharmacological properties to small-molecule drugs. Therefore, developing methods to construct cyclopropanes is of great significance. Nevertheless, the introduction of cyclopropane primarily relies on already-formed cyclopropyl groups, which significantly restricts the diversity of cyclopropane skeletons. Late-stage direct cyclopropanation is still a challenging task. Herein, a photo-induced intermolecular deoxycyclopropanation reaction that employs alcohols as substrates, and 1 mol.% of 2,3,5,6-tetrakis(carbazol-9-yl)-1,4-dicyanobenzene (4CzTPN) as organophotocatalyst is reported. This method proceeds with high transformation efficiency (up to 98% yield) and exhibits broad functional group tolerance, such as primary, secondary, and tertiary alcohols as well as various activated β-halogenated alkenes. This process is mild, easy to operate, and has low equipment requirements. The power of this technology is demonstrated by the late-stage functionalization of five marketed drugs and five natural products.
04 Nov 03:41
by Arsalan Razzaq, Asmat Ullah, Anand S. Subbiah, and Stefaan De Wolf
ACS Energy Letters
DOI: 10.1021/acsenergylett.4c02757
04 Nov 03:28
by Viktor Škorjanc, Aleksandra Miaskiewicz, Marcel Roß, Suresh Maniyarasu, Stefanie Severin, Matthew R. Leyden, Philippe Holzhey, Florian Ruske, Lars Korte, and Steve Albrecht
ACS Energy Letters
DOI: 10.1021/acsenergylett.4c02173
04 Nov 03:28
by Xiaodan Tang, Bingyao Shao, Bo Li, Miao Li, Lulu Jiang, Mutalifu Abulikemu, Hongwei Zhu, Jianxing Xia, Osman M. Bakr, and Hairui Liu
ACS Energy Letters
DOI: 10.1021/acsenergylett.4c02715
04 Nov 03:27
by Aditya Singh, Manoj Kumar, and Vandana Bhalla
ACS Applied Materials & Interfaces
DOI: 10.1021/acsami.4c13572
04 Nov 03:26
by Kunpeng Li,
Yong Zhu,
Xiong Chang,
Mengni Zhou,
Xixi Yu,
Xinlong Zhao,
Tao Wang,
Zhongming Cai,
Xing Zhu,
Hua Wang,
Jiangzhao Chen,
Tao Zhu
The 5-fluoropyridinic acid (FPA) self-induced bifacial passivation strategy not only effectively passivates the uncoordinated Pb/Pb2+ at the upper and lower interfaces of the perovskite films, but also improves the quality of the films. Furthermore, due to the matching of the energy levels, the extraction rate of the carriers at the bifacial interface is simultaneously improved.
Abstract
The uncontrolled crystallization of perovskite generates a significant number of internal and interfacial defects, posing a major challenge to the performance of perovskite solar cells (PSCs). In this paper, a novel bi-interfacial modification strategy utilizing 5-fluoropyridinic acid (FPA) is proposed to modulate crystal growth and provide defect passivation. It is demonstrated that FPA is self-deposited at both the top and bottom interfaces of perovskite films during thermal annealing. The CO and N functional groups in FPA serve as chelating agents, binding closely to uncoordinated Pb2+/Pb clusters, thereby passivating defects and reducing charge recombination at the interfaces. The strong chemical interactions between FPA and Pb further stabilize the Pb-I framework, promoting the formation of high-quality perovskite films, as confirmed by in situ photoluminescence measurements. Consequently, the modified inverted PSCs achieved an exceptional power conversion efficiency (PCE) of 25.37%. Moreover, the devices retained over 93.17% of initial efficiency after 3000 h of continuous illumination under one-sun equivalent conditions in a nitrogen atmosphere. This paper presents a promising pathway for enhancing the performance and stability of inverted PSCs through a self-induced bi-interfacial modification approach.
04 Nov 03:05
by Christina Cheng,
Yilei Wu,
Camila Cendra,
Sebastian Schneider,
Jeremy Treiber,
Puja Agarwala,
Enrique D. Gomez,
Zhenan Bao,
Christopher Takacs,
Michael F. Toney,
Alberto Salleo
The performance of PBDBT: N2200-based all-polymer solar cells can be enhanced by processing with dilute diiodooctane solvent additive. This study reveals the microstructural mechanisms that drive charge transport enhancements in these solar cells by combining X-ray techniques with electron microscopy. Ultimately, the study finds that processing with dilute diiodooctane promotes efficient vertical charge transport pathways while preserving donor–acceptor interfacial connectivity.
Abstract
The performance of all-polymer solar cells is often enhanced by incorporating solvent additives during solution processing. In particular, blends based on the model all-polymer system PBDBT:N2200 have been shown to have increased short-circuit current and fill factor when processed with dilute diiodooctane (DIO). However, the morphological mechanism that drives the increase in performance is often not well understood due to limitations in common characterization techniques. In this study, it is shown that a combination of X-ray techniques with cryogenic high-resolution transmission electron microscopy (HRTEM) analysis can provide a quantitative and spatially resolved picture of polymer chain orientation and alignment in all-polymer blends. It is found that DIO induces vertical phase separation in PBDBT-2F:F-N2200 and increases donor crystallite thickness in the pi-stacking direction leading to an acceptor-rich film surface. However, it is also shown that DIO does not disrupt the formation of face-on donor–acceptor interfaces. These findings suggest that dilute DIO primarily affects crystalline domain formation in single component regions as opposed to mixed regions; thus, dilute DIO can impact vertical charge transport pathways without sacrificing donor–acceptor interfacial connectivity.
04 Nov 03:01
by Xujie Wang,
Xinhui Gao,
Hai Zhong,
Kai Yang,
Biao Zhao,
Jianping Deng
Three-level chirality transfer and amplification from point chirality of small molecules to helical chirality of helical polymers and finally to supramolecular chirality of cholesteric liquid crystals consisting of chiral nonfluorescent polymers and nematic liquid crystals is constructed. Full-color and white CPL are realized via further introducing achiral fluorophores. Anti-counterfeiting security, information encryption, and chiral logic gate applications are developed.
Abstract
Chiral liquid crystal supramolecular assembly provides an ideal strategy for constructing excellent circularly polarized luminescence (CPL) materials. However, the chirality transfer in chiral liquid crystals normally occurs at two levels from the configurational chirality to the supramolecular phase chirality. The more precise and more levels of chirality transmission are fascinating but remain challenging. The present work reports the first success of three-level chirality transfer and amplification from configurationally point chirality of small molecules to conformationally helical chirality of helical polymers and finally to supramolecular phase chirality of cholesteric liquid crystals composed of chiral nonfluorescent polymers (P46) and nematic liquid crystals. Noticeably, the helical twisting power of P46 is five-fold larger than its monomer. Full-color and white CPL with maximum luminescence dissymmetry factor up to 1.54 and photoluminescence quantum yield up to 63.8% are realized utilizing helical supramolecular assembly combined with selective reflection mechanism. Also significantly, the electrically stimuli-responsive CPL switching device as well as anti-counterfeiting security, information encryption, and chiral logic gate applications are developed. This study deepens the understanding of chirality transfer and amplification across different hierarchical levels.
04 Nov 03:00
Chem. Commun., 2024, Accepted Manuscript
DOI: 10.1039/D4CC04620J, Communication
Aopu Wang, Xueru Zhao, Hui Zhang, Yanjun Ding, Min Xue, Li Shao
The host–guest complexation behaviors between perethylated pillar[n]arenes and quinonoid compounds are investigated in both solution and solid state. The resulting host–guest cocrystals demonstrate remarkable near-infrared photothermal conversion properties.
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04 Nov 02:58
Chem. Commun., 2024, Accepted Manuscript
DOI: 10.1039/D4CC04167D, Communication
Bing Zheng, Shulong Wang, Lixian Huang, Jiayao Xu, Yan-Ni Luo, Shulin Zhao
A sensitive near-infrared ratiometric fluorescence sensing platform was designed and structureed. The platform consisted of carbon dots and a small organic molecule probe with pinacol phenylborate as the recognition group,...
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04 Nov 02:52
J. Mater. Chem. C, 2024, Accepted Manuscript
DOI: 10.1039/D4TC03414G, Paper
Naveen K Tailor, Rohit Rohj, Krishanu Dey, Samuel D Stranks, D. D. Sarma, Soumitra Satapathi
Bismuth halide perovskite crystals have garnered a lot of interest lately because of their superior optoelectronic qualities, affordability, and ease of processing. Nonetheless, most of the research has concentrated on...
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04 Nov 02:51
J. Mater. Chem. C, 2024, Accepted Manuscript
DOI: 10.1039/D4TC04111A, Review Article
Bo Xu, Xiaoxiao Yang, Xin Luo, Yuxiao Guo, Dan Zhao, Esmaeil Sheibani
Metal halide perovskites have emerged as promising semiconductors for next-generation optoelectronics, particularly due to their solution processability and exceptional semiconductor properties. Over the past few decades, the performance of perovskite-based...
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04 Nov 02:51
J. Mater. Chem. C, 2024, 12,5596-5607
DOI: 10.1039/D4TC00271G, Paper
D. S. Shtarev, D. A. Chaplygina, O. V. Patrusheva, C. Chen, A. V. Shtareva, C. C. Stoumpos, R. Kevorkyants, A. V. Emeline
This work presents the synthesis and optoelectronic properties of the crystalline phases [Pb2Br5][C6NH8] and [PbBr3][C6NH8] of 2-methylpyridinium lead bromide.
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04 Nov 02:50
J. Mater. Chem. C, 2024, 12,5469-5479
DOI: 10.1039/D3TC03768A, Paper
Seon Bin Song, Myungsun Sim, Min Seok Ki, Taewoo Kim, You Kyoung Chung, Joonsuk Huh, Ohyun Kwon, Keewook Paeng
Simultaneous improvement in the thermal stability and electrical properties of an electron transport material by mixing components that form intermolecular lithium bonding between different mixing components.
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01 Nov 04:47
by Angelika Harter, Kerem Artuk, Florian Mathies, Orestis Karalis, Hannes Hempel, Amran Al-Ashouri, Steve Albrecht, Rutger Schlatmann, Christophe Ballif, Bernd Stannowski, and Christian M. Wolff
ACS Applied Materials & Interfaces
DOI: 10.1021/acsami.4c09264
01 Nov 04:46
by Gulzhan Zhumadil, Menghua Cao, Yu Han, Vladimir Pavlenko, Gaukhar Nigmetova, Zhuldyz Yelzhanova, Hryhorii P. Parkhomenko, Zhazira Ergasheva, Damir Aidarkhanov, Mannix P. Balanay, Askhat N. Jumabekov, Gang Li, Zhiwei Ren, and Annie Ng
ACS Applied Materials & Interfaces
DOI: 10.1021/acsami.4c15880
01 Nov 04:46
by Miao He, Chuwu Xing, Qinhui Bao, Linkai Yu, Zhiwei Nie, Rihua Wang, Chunsheng Wan, Duofa Wang, and Tianjin Zhang
ACS Applied Materials & Interfaces
DOI: 10.1021/acsami.4c13643
01 Nov 04:39
by Suhendro Purbo Prakoso,
Hsun‐Xien Peng,
Mei‐Nung Chen,
Qi‐An Hong,
Rosari Saleh,
Yu‐Cheng Chiu
Caption: To realize high-performance transistor memory can be challenging owing to the contradictory nature properties of charge trapping stability and injection efficiency. By investigating the energy mismatch of tunneling materials using different conjugation lengths or blends of polymers, the fabricated tunneling-driven transistor memory using a 300 nm SiO2 dielectric shows a broad memory window of ≈77.6 V, high on–off ratio >104, longer charge trapping lifetime, faster operations (≈1 s) and lower driving voltage (≈20 V).
Abstract
Highly efficient charge injection and charge trapping stability of the tunneling layer are of desirable and practical importance to transistor memory applications. However, both of which can be contradictory to the nature properties of its material. It is herein demonstrated that lowering the energy mismatch of the tunneling layer by employing a longer conjugation length of the polymer can improve the charge injection efficiency, albeit the trapped charges will be easily diminished and finally losing its memory characteristics, and vice versa. To further elaborate and verify this concept, both materials are blended with distinct nature of properties as the tunneling layer in pentacene-based transistor devices. As the results, the device using 300 nm SiO2 with optimum blending ratio displays a broad memory window of ≈77.6 V which is superior to the non-blended tunneling layer carrying appropriate energy levels and band gap energy, not to mention, revealing fast operation time (≈1 s), low driving voltage (≈20 V), long retention (>104 s), and high switching stability over 50 cycles with on–off ratio of >104. Most importantly, this finding shed insight into the design of tunneling materials for advancing organic transistor memory technologies based on tunneling-effect-boosted interfacial charge trapping.
01 Nov 04:38
by Mingguang Li,
Wenjing Pan,
Lian Zhao,
Wei Wan,
Yong Deng,
Ke Guo,
Wenhan Yang,
Ling‐Jun He,
Runfeng Chen,
Guangbao Wu
A multisite atomic-oxygen anchoring strategy using 1,1,2,2-tetra(4-methoxyphenyl)ethene (TMPE) is investigated for its potential to enhance perovskite photovoltaic performance. TMPE coordinates iodine vacancies and passivates Pb2+ or MA+ defects, as confirmed by density functional theory calculations. This method improves crystallinity, surface defect passivation, and photovoltaic efficiency, achieving outstanding stability and efficiency in both MA- and FA-based perovskite solar cells.
Abstract
Lewis base molecules are widely used to passivate structural defects in perovskites. However, the spatial compatibility between these molecules and the perovskite lattice is seldom considered. Herein, a multisite atomic-oxygen (O) anchoring passivation strategy using 1,1,2,2-tetra(4-methoxyphenyl)ethene (TMPE), which contains four electronegative O atoms to selectively anchor iodine vacancies and passivate under-coordinated Pb2+ or MA+ defects is proposed. It is found that the distance between any three O atoms in a TMPE molecule matches that of iodine ions in the lattice structure, thereby maximizing passivation effects and enhancing lattice stability. Additionally, the coordination of TMPE facilitates the formation of larger colloid sizes in the precursor solution, effectively regulating crystal growth. Due to the molecular extrusion effect, TMPE-based anchors localize on the surface, passivating defects and mitigating nonradiative recombination. As a result, defects in MA-based and FA-based perovskite films are significantly reduced, achieving optimized power conversion efficiencies (PCEs) of 19.9% and 24.5%, while exhibiting exceptional stability by retaining 90% of initial PCE after 1200 h of storage without encapsulation. This single molecule-controlled perovskite multisite anchoring strategy would help resolve lattice stability issue caused by perovskite defects, thereby paving the pathway for the development of high-performance and highly stable perovskite solar cells.
01 Nov 04:29
by Kaixuan Yang,
Xingchao Zhao,
Bingzhe Wang,
Xiaoling Ma,
Lifang Lu,
Jian Wang,
Guichuan Xing,
Fujun Zhang
Broadband photomultiplication type organic photodetectors (PM-OPDs) are prepared with the structure of ITO/PNDIT-F3N/F8BT/Y6-1O:P3HT (100:3, wt/wt)/Al, exhibiting the external quantum efficiency of 4200% at 360 nm and 6600% at 850 nm under −8 V bias. F8BT buffer layers are employed to suppress the dark current density of PM-OPDs by three orders of magnitude, leading to the 40-fold increase in single-to-noise ratios.
Abstract
The photomultiplication type organic photodetectors (PM-OPDs) are prepared with structure of ITO/PNDIT-F3N/F8BT/Y6-1O:P3HT (100:3, wt/wt)/Al, containing hole traps formed with P3HT surrounded by Y6-1O in active layers. The PM-OPDs exhibit external quantum efficiency (EQE)>100% in the spectral response range from 310 to 910 nm, resulting from electron tunneling injection assisted by trapped hole near ITO electrode. The incorporation of F8BT buffer layers can induce the markedly decreased dark current density (JD
) due to the large electron injection barrier. The light current density (JL
) of PM-OPDs exhibits slightly decreased by inserting F8BT buffer layers due to the enhanced electron tunneling injection assisted by the more trapped holes near ITO electrode. The signal-to-noise ratio (SNR) of PM-OPDs achieves over 40-fold increment by inserting appropriate thickness of F8BT buffer layers, resulting from the markedly decreased JD
and reasonably high JL
. The optimal PM-OPDs exhibit excellent photodetection capability with EQE of 4200% at 360 nm and 6600% at 850 nm, associated with the specific detectivity of 3.9 × 1011 Jones at 360 nm and 9.7 × 1011 Jones at 850 nm.
01 Nov 04:26
J. Mater. Chem. C, 2024, Accepted Manuscript
DOI: 10.1039/D4TC02975E, Perspective
Muhammad Umair Ali, Atta Ur Rehman, Aleksandra Djurisic
Significant progress in stability of metal halide perovskite light emitting diodes (LEDs) has been made in recent years, with impressive increase in record lifetimes. However, a large number of published...
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01 Nov 04:26
J. Mater. Chem. C, 2024, Accepted Manuscript
DOI: 10.1039/D4TC03931A, Paper
Yuyu Liu, Minming Yan, Fan He, Weina Zhang, Yunwei Wang, Ziyu Qin, Kai Zhang, Ye Chen, Yong Zhang
Carrier transport balance is crucial for fabricating high-performance quantum-dot light-emitting diodes (QLEDs). However, owing to the deep Highest Occupied Molecular Orbital (HOMO) and large bandgap of the blue CdSe/CdS/ZnS QDs,...
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01 Nov 04:21
Chem. Sci., 2024, Accepted Manuscript
DOI: 10.1039/D4SC04915B, Edge Article
Open Access
Zixuan Zhang, Jin Wu, Haipeng Lu
Understanding the structure-chiroptical activity relationship in chiral perovskites is of great significance as it provides a pathway to control light-matter interactions. Although many reports have shown various chiral structures with...
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