好文分享/优化器件制备方法获得效率达11.3%的非富勒烯型聚合物太阳电池：研究论文

聚合物太阳能电池由于其重量轻、价格低廉、可通过印刷的方式制备大面积柔性器件等优势，得到了学术界和工业界的广泛关注，是重要的前沿的研究领域。采用非富勒烯型受体制备聚合物太阳电池有助于克服光伏活性层光吸收不足、材料成本高、以及热稳定性差的缺点，因此国内外的多个研究组聚焦于非富勒烯型聚合物太阳电池的研究。近期，中国科学院化学研究所侯剑辉研究员接受Science China Chemistry特约编辑——香港科技大学唐本忠院士和华南理工大学秦安军教授邀请，为该刊“Frontiers in Polymer Science”专题撰写了研究论文“Realizing 11.3% efficiency in fullerene-free polymer solar cells”。

侯剑辉课题组的赵文超等人采用该课题组自主设计合成的聚合物光伏材料PBDB-T为给体，与近期广受关注的非富勒烯型有机小分子半导体材料ITIC为受体，制备了高性能的聚合物太阳电池。在该论文中，研究人员分别采用调制主溶剂、溶剂添加剂、退火温度、器件结构等方法，对基于PBDB-T:ITIC的聚合物太阳电池的器件制备方法进行了细致优化，讨论了溶液成膜条件、器件活性层微观形貌、以及光伏效率之间的关系，最终在非富勒烯型聚合物太阳电池中取得了达11.3%的光伏效率。此外，该电池也表现出出色的稳定性。

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Realizing 11.3% efficiency in fullerene-free polymer solar cells by device optimization

Wenchao Zhao^1,2, Shaoqing Zhang¹ & Jianhui Hou^1,2*

¹State Key Laboratory of Polymer Physics and Chemistry, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China

²University of Chinese Academy of Sciences, Beijing 100049, China

Sci China Chem, 2016, 59, doi: 10.1007/s11426-016-0198-0

In this work, photovoltaic properties of the PBDB-T:ITIC based-NF-PSCs were fully optimized and characterized by tuning the morphology of the active layers and changing the device architecture. First, donor/acceptor (D/A) weight ratios were scanned, and then further optimization was performed by using different additives, i.e. 1,8-diiodooctane (DIO), diphenyl ether (DPE), 1-chloronaphthalene (CN) and N-methyl-2-pyrrolidone (NMP), on the basis of best D/A ratio (1:1, w/w), respectively. Finally, the conventional or inverted device architectures with different buffer layers were employed to fabricate NF-PSC devices, and meanwhile, the morphology of the active layers was further optimized by controlling annealing temperature and time. As a result, a record efficiency of 11.3% was achieved, which is the highest result for NF-PSCs. It’s also remarkable that the inverted NF-PSCs exhibited long-term stability, i.e. the best-performing devices maintain 83% of their initial PCEs after over 4000 h storage.