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Non-conjugated polymers as thickness-insensitive electron transport materials in high-performance inverted organic solar cells

查看全文 作　　者：Zhiquan [1,2]Zhang;Zheling [2]Zhang;Yufu [1]Yu;Bin [1]Zhao;Sheng [3]Li;Jian [2]Zhang;Songting [1]Tan 高影响力作者 机构地区：[1]Key Laboratory for Green Organic Synthesis and Application of Hunan Province,Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education,College of Chemistry,Xiangtan University,Xiangtan 411105,Hunan,China;[2]College of Material Science&Engineering,Guangxi Key Laboratory of Information Materials,Guilin University of Electrical Technology,Guilin 541004,Guangxi,China;[3]Hunan Research Institute of Light Industry,Changsha 410015,Hunan,China高影响力机构 出　　处：《Journal of Energy Chemistry》索引2020年第29卷第8期,共8页高影响力期刊 基　　金：the support from the National Natural Science Foundation of China (51873177, 51573153, 61564003 and 21875204);the group of Advanced Photoelectricity and Supermolecule Function Materials of Ministry of Education (IRT-17R90);the Hunan 2011 Collaborative Innovation Center of Chemical Engineering & Technology with Environmental Benignity and Effective Resource Utilization;support from Guangxi Bagui Scholar Program and Guangxi Natural Science Foundation (2015GXNSFGA139002)。 摘　　要：Two non-conjugated polymers PEIE-DBO and PEIE-DCO, prepared by quaternization of polyethyleneimine ethoxylate by 1,8-dibromooctane and 1,8-dichlorooctane respectively, are developed as electron transport layer(ETL) in high-performance inverted organic solar cells(OSCs), and the effects of halide ions on polymeric photoelectric performance are fully investigated. PEIE-DBO possesses higher electron mobility(3.68×10-4 cm2 V-1s-1), higher conductivity and more efficient exciton dissociation and electron extraction, attributed to its lower work function(3.94 eV) than that of PEIE-DCO, which results in better photovoltaic performance in OSCs. The inverted OSCs with PTB7-Th: PC71BM as photoactive layer and PEIE-DBO as ETL exhibit higher PCE of 10.52%, 9.45% and 9.09% at the thickness of 9, 35 and 50 nm,respectively. To our knowledge, PEIE-DBO possesses the best thickness-insensitive performance in polymeric ETLs of inverted fullerene-based OSCs. Furthermore, PEIE-DBO was used to fabricate the inverted non-fullerene OSCs(PM6:Y6) and obtained a high PCE of 15.74%, which indicates that PEIE-DBO is effective both in fullerene-based OSCs and fullerene-free OSCs. 关 键 词：Organic solar cells Electron transport materials Thickness-insensitive Non-conjugated polymer
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