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Revealing the Unusual Efficiency Enhancement of Organic Solar Cells with Polymer-Donor-Treated Cathode Contacts

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Chinese Journal of Polymer Science 2022年第8期40卷 937-943,I0009页

作者： Zesheng Liu Yawen Li Xiaojun Zhao Yufan Zhu yuze lin Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China

The metal oxides with low trap density of states as the electron transport layer are crucial for the high performance of the organic solar cells(OSCs).It is universally acknowledged that modifying n-type metal oxide contacts with polymer donors will harm the carrier extraction on account of the mismatched energy level.However,we find that modifying interlayer consisting of the alcohol amines with some polymer donor additive can unusually enhance the performance of the OSCs.Compared with triethanolamine(TEA)passivated ZnO,TEA:polymer donor treated ZnO shows lower trap density and enhances electron mobility resulting in higher current density in OSC devices.Here,we reveal that the enhanced oxygen-defect passivation ability of TEA with polymer additive is attributed to the enhanced negative electrostatic potential of TEA owing to the hydrogen bond formation between the polymer and the hydroxyl group in TEA.This strategy that enhancing the negative electrostatic potential of the passivators for improving oxygen defect passivation can be extended to other types of organic electronic devices.

关键词： Organic solar cell Electron transport layer Trap density Passivation Hydrogen bond

Effects of Thieno[3,2-b]thiophene Number on Narrow-Bandgap Fused-Ring Electron Acceptors

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Chinese Journal of Polymer Science 2022年第8期40卷 914-920,I0008页

作者： Tengfei Li Guilong Cai yuze lin Xinhui Lu Xiaowei Zhan Key Laboratory of Polymer Chemistry and Physics of Ministry of Education School of Materials Science and EngineeringPeking UniversityBeijing100871China Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing100190China Department of Physics The Chinese University of Hong KongHong Kong999077China

We synthesize and compare four near-infrared absorbing fused-ring electron acceptors named as nTTIC(n=2,3,4,and 5),based on different number of thieno[3,2-b]thiophene(TT)unit as the electron-donating core.With increasing the TT unit,absorption spectrum of the TTIC series red shifts,and the highest occupied molecular orbital(HOMO)upshifts notably.It is worth noting that 4TTIC and 5TTIC exhibit absorption edges approaching 1100 nm,which is the photoresponse limit of solar cells based on crystal silicon.When the TTIC series acceptors are blended with polymer donor PM6,the binary-blend organic solar cells based on 3TTIC show the best power conversion efficiency(PCE)of 13.1%.In contrast,2TTIC-based devices exhibit relatively lower PCE of 8.32%,mainly caused by the larger energy loss and blue-shifted absorption.Due to insufficient driving force of charge separation caused by very high HOMO,4TTIC and 5TTIC show poor PCEs lower than 3%.

关键词： Thieno[3,2-b]thiophene Near-infrared absorption Fused-ring electron acceptor Nonfullerene Organic solar cell

Fine-Tuning Contact via Complexation for High-Performance Organic Solar Cells

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CCS Chemistry 2022年第3期4卷 1087-1097页

作者： Yawen Li Zhenzhen Zhang Xiaona Han Tao Li yuze lin Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190 University of Chinese Academy of Sciences Beijing 100049 Center for Spintronics and Quantum Systems State Key Laboratory for Mechanical Behavior of MaterialsDepartment of Materials Science and EngineeringXi’an Jiaotong UniversityXi’anShaanxi 710049

For organic optoelectronic devices,precise tuning of the electrical property of both active layers and interfaces is crucial to achieve enhanced device performance.Herein,we developed a facile method using complexation to modify the work function and energy levels of cathode contact layers in organic solar cells(OSCs)to achieve suitable work function and energy levels while retaining relatively good conductivity.Compared with the control devices with neat(N,Ndimethyl-ammonium N-oxide)propyl perylene diimide(PDINO)contacts,the tris(pentafluorophenyl)borane(BCF)-complexed PDINO cathode contacts showed enhanced power conversion efficiencies(PCEs),which is independent of the composition of the active layer.More specifically,single-junction OSCs employing PDINO cathode contact with 2 wt%BCF-additive achieved an average PCE of 17.7%.Based on experimental data and theoretical modeling,we found that the boron cores of BCF coordinate with the amino N-oxide terminal substituent of PDINO after generating BCF–H2O/methanol complexes.BCF segments with a strong electron-withdrawing property can effectively reduce the energy levels of the PDINO–BCF complex,and thus enhance device PCE when it is used as a cathode contact in OSCs.This strategy can be extended to other types of photovoltaic devices,photodetectors,and light-emitting diodes.

关键词： organic solar cells interface cathode contact complexation work function

Enhancing Photovoltaic Performance of Asymmetric Fused-Ring Electron Acceptor by Expanding Pyrrole to Pyrrolo[3,2-b]pyrrole

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Chinese Journal of Chemistry 2022年第24期40卷 2861-2866页

作者： Zemin Wang Guilong Cai Peiyao Xue Zesheng Liu Boyu Jia Nan Li Jiayu Wang Xinhui Lu yuze lin Guojie Wang Xiaowei Zhan School of Materials Science and Engineering University of Science and Technology BeijingBeijing100083 China Key Laboratory of Polymer Chemistry and Physics of Ministry of Education School of Materials Science and EngineeringPeking UniversityBeijing100871 China Department of Physics The Chinese University of Hong KongNew Territories999077 Hong KongChina Chinese Academy of Sciences Beijing National Laboratory for Molecular SciencesCAS Key Laboratory of Organic SolidsInstitute of ChemistryBeijing100190 China

We propose a strategy to improve performance of unidirectionally extended fused-ring electron acceptors by using pyrrolo[3,2-b]pyrrole to replace pyrrole ring, and design two asymmetric nonfullerene acceptors 1PIC and 2PIC. Replacing pyrrole in 1PIC with pyrrolo[3,2-b]pyrrole remarkably red-shifts absorption peak by 109 nm, elevates the HOMO and LUMO energy levels, and improves electron mobility. The photovoltaic devices based on blend of PM6 donor and 2PIC acceptor exhibit power conversion efficiency as high as 12.6%, which is much higher than that of PM6:1PIC (3.53%), due to more efficient exciton generation and dissociation, faster and more balanced carrier transport and less charge recombination.

关键词： Energy conversion Fused-ring electron acceptor Pyrrolo[3,2-b]pyrrole Asymmetric synthesis Semiconductors

Exciton diffusion and dissociation in organic and quantum-dot solar cells

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SmartMat 2023年第6期4卷 11-30页

作者： Dan He Miao Zeng Zhenzhen Zhang Yang Bai Guichuan Xing Hui-Ming Cheng yuze lin Department of Metallurgy and Applied Physical Chemistry College of Chemistry and Chemical EngineeringCentral South UniversityChangshaChina Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijingChina Faculty of Materials Science and Energy Engineering/Institute of Technology for Carbon Neutrality Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhenChina Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoMacaoChina University of Chinese Academy of Sciences BeijingChina Australian Institute for Bioengineering and Nanotechnology The University of Queensland BrisbaneSt LuciaQueenslandAustralia

For the process of photovoltaic conversion in organic solar cells(OSCs)and quantum-dot solar cells(QDSCs),three of four steps are determined by exciton behavior,namely,exciton generation,exciton diffusion,and exciton dissociation.Therefore,it is of great importance to regulate exciton behavior in OSCs and QDSCs for achieving high power conversion efficiency.Due to the rapid development in materials and device fabrication,great progress has been made to manage the exciton behavior to achieve prolonged exciton diffusion length and improved exciton dissociation in recent years.In this review,we first introduce the parameters that affect exciton behavior,followed by the methods to measure exciton diffusion length.Then,we provide an overview of the recent advances with regard to exciton behavior investigation in OSCs and QDSCs,including exciton lifetime,exciton diffusion coefficient,and exciton dissociation.Finally,we propose future directions in deepening the understanding of exciton behavior and boosting the performance of OSCs and QDSCs.

关键词： exciton behavior exciton diffusion exciton dissociation organic solar cells quantum-dot solar cells

Fused thienobenzene-thienothiophene electron acceptors for organic solar cells

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Journal of Energy Chemistry 2019年第10期28卷 58-65页

作者： Ye Xu Haotian Jiang Tsz-Ki Lau Jingshuai Zhu Jiayu Wang Xinhui Lu Xiaowei Zhan yuze lin Department of Chemistry Capital Normal UniversityBeijing 100048China Department of Materials Science and Engineering Key Laboratory of Polymer Chemistry and Physics of Ministry of EducationCollege of EngineeringPeking UniversityBeijing 100871China Department of Physics The Chinese University of Hong KongNew TerritoriesHong KongChina

Small molecule ladder-type heteroarenes IHBT-2F is designed and synthesized with strong electrondonating and molecular packing properties, where the central unit, fused thienobenzene-thienothiphene (IHBT), is attached with the strong electron-deficient 2-(5,6-difluoro-3-oxo-2,3-dihydro-1H-inden-1-ylidene)malononitrile (2FIC) as the end group. The counterpart IDBT-2F with indancenodibenzothiophene (IDBT) mainchain is sythesized for comparison, in which thieno[3,2-b]thiophene (TT) core of IHBT is replaced by benzene core. Relative to benzene-core IDBT-2F, TT-core IHBT-2F shows a much higher highest occupied molecular orbital energy level (IHBT-2F:-5.46 eV;IDBT-2F:-5.72 eV) and significantly redshifted absorption, due to the π-donor capability of the sulfur atom, the larger π-conjugation and stronger intermolecular π-π stacking. The as-cast organic solar cells (OSCs) based on blends of PTB7-Th donor and IHBT-2F acceptor without additional treatments exhibit power conversion efficiencies (PCEs) as high as 8.74%, which is much higher than that of PTB7-Th:IDBT-2F (6.73%).

关键词： Organic solar cell Fused ring electron acceptor Thienobenzene Non-fullerene

Enhancing photovoltaic performance via aggregation dynamics control in fused-ring electron acceptor

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Aggregate

Aggregate 2021年第3期2卷 1-8页

作者： Jiayu Wang Runyu Zhu Shijie Wang Yawen Li Boyu Jia Jiadong Zhou Peiyao Xue Susanne Seibt yuze lin Zengqi Xie Wei Ma Xiaowei Zhan Department of Materials Science and Engineering College of EngineeringKey Laboratory of Polymer Chemistry and Physics of Ministry of EducationPeking UniversityBeijingChina State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’anChina Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijingChina Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhouChina Australian Synchrotron ClaytonVictoriaAustralia

A new fused-ring electron acceptor FNIC3 with dynamics controlled aggregation behavior was synthesized.FNIC3 shows strong absorption in 600–900 nm,HOMO/LUMO energy levels of−5.59/−4.04 eV,and electron mobility of 1.2×10^(−3) cm^(2) V^(−1) s^(−1).The aggregation of FNIC3 shows strong dependency on film formation time.Prolongation of film formation time promotes the crystallization of FNIC3,leading to improved crystallinity and enlarged aggregate sizes.Aggregation of FNIC3 significantly influences the photovoltaic device parameters.Appropriate aggregation red-shifts the absorption and improves the mobilities of the blend,which contributes to high photocurrent and fill factor thus high power conversion efficiency(PCE).Overaggregation leads to increased nonradiative energy loss and insufficient charge generation,resulting in decreased open-circuit voltage and short-circuit current density.The blends based on PM6:FNIC3 fabricated under proper film formation time exhibit a PCE of 12.3%,higher than those fabricated under short and long film formation time(10.0–10.5%).

关键词： aggregation dynamics fused-ring electron acceptor nonfullerene acceptor organic solar cell

米糠清蛋白刺槐豆胶多重乳液制备及包埋DHA藻油的研究

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中国食品添加剂 2024年第3期35卷 171-180页

作者：林雨泽毕海鑫廖子嫣那治国哈尔滨商业大学食品工程学院哈尔滨150028 黑龙江东方学院食品工程学院哈尔滨150066

以米糠清蛋白和刺槐豆胶为壁材,以二十二碳六烯酸(Docosahexaenoic Acid简称DHA)藻油为芯材制备多重乳液,通过喷雾干燥法制备DHA藻油微胶囊。通过单因素实验确定DHA藻油多重乳液最佳的制备工艺为高速分散机转速12000 r/min、高压均质机... 详细信息

以米糠清蛋白和刺槐豆胶为壁材,以二十二碳六烯酸(Docosahexaenoic Acid简称DHA)藻油为芯材制备多重乳液,通过喷雾干燥法制备DHA藻油微胶囊。通过单因素实验确定DHA藻油多重乳液最佳的制备工艺为高速分散机转速12000 r/min、高压均质机压强40 MPa、一级乳液和水相之比为3∶7;DHA藻油微胶囊最佳的成分配比为蛋白质含量0.6%、刺槐豆胶含量0.4%、DHA藻油含量1.5%,pH值为7.0,并对DHA藻油多重乳液的热稳定性和流变学以及DHA藻油微胶囊的贮藏稳定性、微观结构和生物利用率进行研究。试验结果表明:DHA藻油经米糠清蛋白和刺槐豆胶组成的复合壁材包埋后稳定性显著增强;采用复合壁材的DHA藻油微胶囊极大的提高了DHA的生物利用率并且具有良好的热稳定性。

关键词：二十二碳六烯酸多重乳液微胶囊:米糠清蛋白

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非对称稠环光伏电子受体

高等学校化学学报 2023年第7期44卷 71-82页

作者：司文钦李腾飞林禹泽中国科学院化学研究所有机固体实验室北京分子科学国家研究中心北京100190 中国科学院大学北京100049

近几年,受益于稠环电子受体材料的蓬勃发展,有机太阳能电池的能量转换效率从富勒烯时代的12%迅速提高到非富勒烯时代的20%.其中,非对称结构的分子设计策略发挥了重要作用.本文按照稠环骨架、末端基团和侧链3种非对称分子设计策略,综合... 详细信息

近几年,受益于稠环电子受体材料的蓬勃发展,有机太阳能电池的能量转换效率从富勒烯时代的12%迅速提高到非富勒烯时代的20%.其中,非对称结构的分子设计策略发挥了重要作用.本文按照稠环骨架、末端基团和侧链3种非对称分子设计策略,综合评述了非对称稠环电子受体的研究进展,并讨论了其中的结构-性能关系;最后,对非对称稠环电子受体的未来发展进行了展望.

关键词：非对称分子结构稠环电子受体非富勒烯受体有机太阳能电池