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

• 作者: Bin Zhao Jian Zhang Sheng Li Songting Tan Yufu Yu Zheling Zhang Zhiquan Zhang
• 来源期刊: 能源化学
• 年，卷（期）: 2020,（8）
• 页码范围: 196-202
• 页数: 7页
• 语种: 英文

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-1 s-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.