Effects of processing additives in non-fullerene organic bulk heterojunction solar cells with efficiency >11%

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英文篇名：Effects of processing additives in non-fullerene organic bulk heterojunction solar cells with efficiency >11% 作者：Shenkun ; Xie ; Jianqiu ; Wang ; Rong ; Wang ; Dongyang ; Zhang ; Huiqiong ; Zhou ; Yuan ; Zhang ; Defeng ; Zhou 英文作者：Shenkun Xie;Jianqiu Wang;Rong Wang;Dongyang Zhang;Huiqiong Zhou;Yuan Zhang;Defeng Zhou;School of Chemistry and Life Science, Changchun University of Technology;HEEGER Beijing Research & Development Center, School of Chemistry, Beihang University;CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology; 英文关键词：Organic solar cell;;Solvent additive;;Morphology;;Recombination;;Non-fullerene 中文刊名：FXKB 英文刊名：中国化学快报(英文版) 机构：School of Chemistry and Life Science, Changchun University of Technology;HEEGER Beijing Research & Development Center, School of Chemistry, Beihang University;CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology; 出版日期：2019-01-15 出版单位：Chinese Chemical Letters 年：2019 期：v.30 基金：the National Natural Science Foundation of China (No. 21471022);; the National Natural Science Foundation of China (No. 21674006);; the Chinese Academy of Science (100 Top Young Scientists Program, No. QYZDB-SSW-SLH033);; the National Key Research and Development Program of China (No. 2017YFA0206600) 语种：英文; 页：FXKB201901049 页数：5 CN：01 ISSN：11-2710/O6 分类号：237-241

摘要

Here we investigate processing additive-dependent photovoltaic performance and charge recombination in organic bulk heterojunction(BHJ) solar cells based on a polymeric donor of PBDB-T blended with a non-fullerene acceptor m-ITIC. We find that PBDB-T:m-ITIC solar cells exhibit good compatibilities with the utilized additives(DIO, CN, DPE, and NMP) in optimal conditions, can have a high charge dissociation probability approaching 100%(with DIO), leading to ultimate efficiency >11%. Regardless of additives, we observe a dominant 1 st order monomolecular recombination with insignificant bi-molecular recombination or space-charge effects in these solar cells. Despite of impressive power conversion efficiency(PCE), it is of surprise that Shockley-Read-Hall recombination is identified to play a role in device operation. Thus, it points to the necessity to mitigate the influences of traps to further boost the efficiency in non-fullerene based organic solar cells.
        Here we investigate processing additive-dependent photovoltaic performance and charge recombination in organic bulk heterojunction(BHJ) solar cells based on a polymeric donor of PBDB-T blended with a non-fullerene acceptor m-ITIC. We find that PBDB-T:m-ITIC solar cells exhibit good compatibilities with the utilized additives(DIO, CN, DPE, and NMP) in optimal conditions, can have a high charge dissociation probability approaching 100%(with DIO), leading to ultimate efficiency >11%. Regardless of additives, we observe a dominant 1 st order monomolecular recombination with insignificant bi-molecular recombination or space-charge effects in these solar cells. Despite of impressive power conversion efficiency(PCE), it is of surprise that Shockley-Read-Hall recombination is identified to play a role in device operation. Thus, it points to the necessity to mitigate the influences of traps to further boost the efficiency in non-fullerene based organic solar cells.

引文

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