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100 cm^(2) organic photovoltaic cells with 23%Efficiency under Indoor Illumination

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Chinese Journal of Polymer Science 2022年第8期40卷 979-988,I0011页

作者： Yong Cui Hui-Feng Yao Ye Xu Peng-Qing Bi Jian-Qi Zhang Tao Zhang Ling Hong Zhi-Hao Chen Zhi-Xiang Wei Xiao-Tao Hao Jian-Hui Hou Laboratory of Polymer Physics and Chemistry Beijing National Laboratory for Molecular SciencesCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China CAS key laboratory of nanosystem and hierarchical fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing100190China School of Physics State Key Laboratory of Crystal MaterialsShandong UniversityJinan250100China

The application of organic photovoltaic(OPV)cells to drive off-grid microelectronic devices under indoor light has attracted broad *** organic semiconductors intrinsically have less ordered intermolecular packing than inorganic materials,the relatively larger energetic disorder is one of the main results that limit the photovoltaic efficiency of the OPV cells at low carrier ***,we optimize the alkyl chains of non-fullerene acceptors to get suppressed energetic *** find the optimal acceptor DTz-R1 with the shortest alkyl chain has the strongest crystalline property and lowest energetic *** a result,over 26%efficiency is recorded for the 1 cm^(2) OPV cells under a light-emitting diode illumination of 500 *** also fabricate a 100 cm^(2) cell device and get a PCE of 23.0%,which is an outstanding value for large-area OPV *** results suggest that modulation of the energetic disorder is of great importance for further improving the efficiency of OPV cells,especially for indoor applications.

关键词： organic photovoltaic cells Low light intensity Energetic disorder Energy loss Power conversion efficiency

Efficiency enhancement in DIBSQ：PC71BM organic photovoltaic cells by using Liq-doped Bphen as a cathode buffer layer

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Frontiers of Materials Science 2017年第3期11卷 233-240页

作者： Guo CHEN Changfeng SI Pengpeng ZHANG Kunping GUO Saihu PAN Wenqing ZHU Bin WEI Key Laboratory of Advanced Display and System Applications (Ministry of Education) Shanghai University Shanghai 200072 China

We have improved the photovoltaic performance of 2,4-bis[4-（N,N- diisobutylamino）-2,6-dihydroxyphenyl] squaraine：[6,6]-phenyl C71-butyric acid methyl ester （DIBSQ：PC71BM） organic photovoltaic （OPV） cells via incorporating Liq-doped Bphen （Bphen-Liq） as a cathode buffer layer （CBL）. Based on the Bphen-Liq CBL, a DIBSQ：PC71BM OPV cell possessed an optimal power conversion efficiency of 4.90%, which was 13% and 60% higher than those of the devices with neat Bphen as CBL and without CBL, respectively. The enhancement of the device performance could be attributed to the enhanced electron mobility and improved electrode/active layer contact and thus the improved photocurrent extraction by incorporating the Bphen-Liq CBL. Light-intensity dependent device performance analysis indicates that the incorporating of the Bphen-Liq CBL can remarkably improve the charge transport of the DIBSQ：PC71BM OPV cell and thus decrease the recombination losses of the device, resulting in enhanced device performance. Our finding indicates that the doped Bphen-Liq CBL has great potential for high-performance solution-processed small-molecule OPVs.

关键词： organic photovoltaic cells squaraine cathode buffer layer power conversion efficiency solution-process

Patterning of Poly（3,4-Ethylenedioxythiophene）： Poly（Styrenesulfonate） Films via the Rubbing Method in organic photovoltaic cells

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Journal of Physical Science and Application 2014年第8期4卷 475-483页

作者： Li-Chen Huang Hung-Wei Liu Tsu-Ruey Chou Jung Hsieh Wen-Yen Chiu Leeyih Wang Chih-Yu Chao Department of Physics National Taiwan University Taipei 10617 Taiwan Institute of Polymer Science and Engineering National Taiwan University Taipei 10617 Taiwan Institute of Applied Physics National Taiwan University Taipei 10617 Taiwan Department of Chemical Engineering National Taiwan University Taipei 10617 Taiwan Center for Condensed Matter Sciences National Taiwan University Taipei 10617 Taiwan

OPV （organic photovoltaic） cells represent a compelling candidate for renewable energy by solar energy conversion. In recent years, versatile light-trapping measures via structures have been intensively explored to optimize photovoltaic performance. In this work, a unique rubbing technique is demonstrated to create nanoscale grooves on the PEDOT：PSS [poly（3,4-ethylenedioxythiophene）： poly（styrenesulfonate）] surface and the grating-like features are 500 nm wide and 10 nm deep. The PEDOT：PSS film with grooved surface is used as buffer layers for OPV cell devices based on a P3HT：PCBM bulk heterojunction. The patterned surface has a profound effect on carrier mobility, light trapping, and hole collection efficiency, leading to an increase in the short circuit density, filling factor, and power conversion efficiency. These results indicate the feasibility of the rubbing method can be applicable to high-efficiency OPV cells.

关键词： Rubbing technique grooved surface organic photovoltaic cells bulk heterojunction solar cells.

The Effect of Energy Levels of the Electron Acceptor Materials on organic photovoltaic cells

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Smart Grid and Renewable Energy 2011年第3期2卷 278-281页

作者： Hassen Derouiche Sami Saidi Abdelatif Belhadj Mohamed Laboratoire de Photovoltaiques Centre de Recherches et des Technologies de l’EnergieBP 952050 Hammam-LifTunisia

organic photovoltaic cells have been fabricated using copper phthalocyanine CuPc as electron donor and C60 or PCBM as electron acceptor. We have investigated the I-V measurements of two different structures: ITO/PEDOT: PSS/(CuPc:C60 or CuPc:PCBM)/BCP/Al. We have observed that the substitution of PCBM by C60 scales up the photocurrent and the efficiency of the devices. As for the open-circuit voltage and the fill factor, we have seen that Voc and FF depend on the energy difference between the highest occupied molecular orbital (HOMO) of CuPc and the lowest unoccupied molecular orbital (LUMO)of C60 or PCBM.

关键词： CuPc C60 PCBM Energy Levels organic photovoltaic cells

Solution-processable graphene mesh transparent electrodes for organic solar cells

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Nano Research 2013年第7期6卷 478-484页

作者： Qian Zhang Xiangjian Wan Fei Xing Lu Huang Guankui Long Ningbo Yi Wang Ni Zhibo Liu Jianguo Tian Yongsheng Chen Key Laboratory for Functional Polymer Materials and Centre for Nanoscale Science and Technology Institute of Polymer Chemistry College of Chemistry Nankai University Tianjin 300071 China The Key Laboratory of Weak Light Nonlinear Photonics Ministry of Education Teda Applied Physics School and School of Physics Nankai University Tianjin 300071 China

Graphene mesh electrodes （GMEs） with good conductivity and transparency have been fabricated by the standard industrial photolithography and 02 plasma etching process using graphene solutions. organic photovoltaic （OPV） cells using GMEs as the transparent electrodes with a blend of poly-（3-hexylthiophene） phenyl-C61-butyric acid methyl ester （P3HT/PC61BM） as the active layer have been fabricated and exhibit a power conversion efficiency （PCE） of 2.04%, the highest PCE for solution-processed graphene transparent electrode-based solar cells reported to date.

关键词： graphene transparent electrode photolithography mesh electrode organic photovoltaic cells

An Asymmetric Non-fullerene Acceptor with Low Energy Loss and High photovoltaic Efficiency

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Chinese Journal of Chemistry 2023年第9期41卷 1045-1050页

作者： Ye Xu Jingwen Wang Huifeng Yao Pengqing Bi Tao Zhang Jianmei Xu Jianhui Hou Beijing National Laboratory for Molecular Sciences State Key Laboratory of Polymer Physics and ChemistryCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of photovoltaic Science and Technology Trina SolarChangzhouJiangsu 213031China

Minimizing energy loss(E_(loss))plays a key role in improving the power conversion efficiencies(PCEs)of organic solar cells(OSCs).Here,to reveal the feasibility of the asymmetric molecular strategy in designing high-efficiency and low E_(loss)s OSC materials,we adopt the alkyl-alkoxy modification to design an asymmetric non-fullerene acceptor(NFA)named OC8-4F,where its symmetric alkyl-and alkoxy-substituted counterparties(2OC8-4F,eC9-4F)are also *** results suggest that the introduction of a symmetric alkoxy at the edge of eC9-4F can effectively decrease the lowest unoccupied molecular orbit level without greatly changing the highest occupied molecular orbit level,leading to a mediated *** the devices,the OC8-4F possesses well-balanced charge generation and E_(loss),giving the highest PCE of 18%.Our results imply that finely tuning the asymmetric structure can be used as an effective molecular design strategy to improve the photovoltaic performance of OSCs.

关键词： organic photovoltaic cells Non-fullerene acceptors Asymmetric synthesis Energy conversion Polymers

Regioisomeric Polymer Semiconductors Based on Cyano-Functionalized Dialkoxybithiophenes:Structure-Property Relationship and photovoltaic Performance

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Transactions of Tianjin University 2022年第5期28卷 385-397页

作者： Qingqing Bai Jun Huang Han Guo Suxiang Ma Jie Yang Bin Liu Kun Yang Huiliang Sun Han Young Woo Li Niu Xugang Guo Center for Advanced Analytical Science School of Chemistry and Chemical EngineeringGuangzhou UniversityGuangzhou 510006China Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China State Key Laboratory of Luminescent Materials and Devices South China University of TechnologyGuangdong 510640China Department of Chemistry Korea UniversitySeoul 136-713South Korea

Cyano substitution is vital to the molecular design of polymer semiconductors toward highly efficient organic solar ***,how regioselectivity impacts relevant optoelectronic properties in cyano-substituted bithiophene systems remain poorly *** regioisomeric cyano-functionalized dialkoxybithiophenes BT_(HH),BT_(HT),and BT_(TT) with headto-head,head-to-tail,and tail-to-tail linkage,respectively,were synthesized and characterized in this *** resulting polymer semiconductors(PBDTBTs)based on these building blocks were prepared *** regiochemistry and property relationships of PBDTBTs were investigated in *** BTHH moiety has a higher torsional barrier than the analogs BT_(HT) and BT_(TT),and the regiochemistry of dialkoxybithiophenes leads to fine modulation in the optoelectronic properties of these polymers,such as optical absorption,band gap,and energy levels of frontier molecular *** field-effect transistors based on PBDTBT_(HH) had higher hole mobility(4.4×10^(-3) cm^(2)/(V·s))than those(ca.10^(-4) cm^(2)/(V·s))of the other two polymer *** different short-circuit current densities and fill factors were obtained in polymer solar cells using PBDTBTs as the electron *** difference was probed in greater detail by performing space-charge-limited current mobility,thin-film morphology,and transient photocurrent/photovoltage *** findings highlight that the BTHH unit is a promising building block for the construction of polymer donors for highperformance organic photovoltaic cells.

关键词： Cyano substitution Regioselectivity organic photovoltaic cells Polymer semiconductors Mobility

organic photovoltaic cell with 17% efficiency and superior processability

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National Science Review 2020年第7期7卷 1239-1246页

作者： Yong Cui Huifeng Yao Ling Hong Tao Zhang Yabing Tang Baojun Lin Kaihu Xian Bowei Gao Cunbin An Pengqing Bi Wei Ma Jianhui Hou State Key Laboratory of Polymer Physics and Chemistry Beijing National Laboratory for Molecular Sciences CAS Research/Education Center for Excellence in Molecular Sciences Institute of Chemistry Chinese Academy of Sciences University of Chinese Academy of Sciences State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University

The development of organic photoactive materials, especially the newly emerging non-fullerene electron acceptors(NFAs), has enabled rapid progress in organic photovoltaic(OPV) cells in recent *** the power conversion efficiencies(PCEs) of the top-performance OPV cells have surpassed 16%,the devices are usually fabricated via a spin-coating method and are not suitable for large-area ***, we demonstrate that the fine-modification of the flexible side chains of NFAs can yield 17% PCE for OPV cells. More crucially, as the optimal NFA has a suitable solubility and thus a desirable morphology, the high efficiencies of spin-coated devices can be maintained when using scalable blade-coating processing technology. Our results suggest that optimization of the chemical structures of the OPV materials can improve device performance. This has great significance in larger-area production technologies that provide important scientific insights for the commercialization of OPV cells.

关键词： organic photovoltaic cells power conversion efficiency scalable large-area production processability non-fullerene acceptor

Theoretical Study on a Train of Bowl-Shaped PDI dimers Engineering with N-Annulated Bridges

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Theoretical Study on a Train of Bowl-Shaped PDI dimers Engin...