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

作　　者：Wenchao Zhao Shaoqing Zhang Jianhui Hou 

机构地区：[1]State Key Laboratory of Polymer Physics and Chemistry [2] Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China [2]University of Chinese academy of Sciences. Beijing 100049, China

出　　处：《Science China Chemistry》2016年第12期1574-1582,共9页中国科学（化学英文版）

基　　金：supported by the National Basic Research Program(2014CB643501);the National Natural Science Foundation of China(91333204,21325419);the Chinese Academy of Sciences(XDB12030200)

摘　　要：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.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.

关 键 词：polymer solar cells MORPHOLOGY interfacial layers device architecture STABILITY 

分 类 号：TM914.4[电气工程—电力电子与电力传动]