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Regulating the Polymer Crystallize Behavior via the Synergistic

  • [设施]:北京正负电子对撞机
  • [期刊/会议名称]:Organic Electronics
  • [摘要]:In polymer solar cells (PSCs) which are typically processed from solution, the molecules inside the active layer accumulate disorderly, which greatly hinders the exciton dissociation and carrier transport, especially in thick active layers. Here, we propose an effective and simple strategy to solve such problem in poly[(5,6-difluoro-2,1,3-benzothiadiazol-4,7-diyl)-alt-(3,3’’’-di(2-octyldodecyl) 2,2’;5’,2’’;5’’,2’’’-quaterthiophen-5,5’’’-diyl)] (PffBT4T-2OD) polymer based thick active layer by regulating the polymer crystallize behavior via incorporating two synergistic additives diphenylether (DPE) and 1-chloronaphthalene (CN) during the film processing. The as-prepared active layer enables the PSC exhibiting a remarkable high photoelectric conversion efficiency of 10.93%, which is much higher than the standard PSC fabricated without additives under the same conditions (9.05%) or with single additive. The high PCE of the PSCs is a result of the highly ordered molecular packing and the formation of three-dimensional charge transport channels of the polymer donor. It is evidenced that the microstructure of the active layer treated simultaneously with DPE and CN undergoes a double change in the orderly stacking of the alkyl chain and the π-π bond, which is more favorable for the charge transport. The results indicate that the active layer with two synergistic additives can be used as an effective and convenient method for controlling the film morphology in the polymer solar cells
  • [发表日期]:2018
  • [第一作者]:JIAO Zhao
  • [第一作者单位]:Key Laboratory of Luminescence and Optical Information (Beijing Jiaotong University),
  • [通讯作者]:Suling Zhao
  • [通讯作者单位]:Key Laboratory of Luminescence and Optical Information (Beijing Jiaotong University),
  • [论文类型]:期刊
  • [期刊分类]:SCI3
  • [学科分类]:
  • [影响因子]:3.999
  • [关键词]:polymer solar cells, synergistic additives, molecular orientation, morphology, high efficiency
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