A dithieno[3, 2-a:3′, 2′-j][5, 6, 11, 12]chrysene diimide based polymer as an electron transport layer for efficient inverted perovskite solar cells. Issue 7 (5th October 2021)

• Record Type: Journal Article
• Authors: Huang, Jintao; Ge, Congwu; Qin, Fei; Zhang, Jianwei; Yang, Xiaodi; Zou, Ye; Zhou, Yinhua; Li, Wei-Shi; Gao, Xike
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 7(2022)
• Page Start: 2703
• Page End: 2710
• Publication Date: 2021-10-05
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d1tc03942c
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : A series of electron-deficient conjugated polymers (P(DTCDI-T), P(DTCDI-2T) and P(DTCDI-3T)) are reported as effective ETLs for inverted PSCs, resulting in a champion power conversion efficiency (PCE) of 17.88% for P(DTCDI-2T) ETL based devices. Abstract : The electron transport layer (ETL) plays an important role in promoting both photovoltaic performance and stability of perovskite solar cells (PSCs). n-Type conjugated polymers have been developed to replace the widely explored phenyl-C61-butyric acid methyl ester (PCBM) as an ETL, especially in p-i-n inverted planar PSCs, owing to their high-quality film features and excellent electron transport ability. Herein, a series of electron-deficient conjugated polymers (P(DTCDI-T), P(DTCDI-2T) and P(DTCDI-3T)) consisting of dithieno[3, 2- a :3′, 2′- j ][5, 6, 11, 12]chrysene diimides (DTCDI) and different thiophene based units (thiophene (T), 2, 2′-bithiophene (2T) and 2, 2′:5′, 2′′-terthiophene (3T)) are reported as effective ETLs for inverted PSCs. Compared to control devices based on the PCBM ETL, these polymer-based devices display better photovoltaic performance, which is mainly due to the optimized electron extraction and transport properties of these DTCDI-based polymers, resulting in a champion power conversion efficiency (PCE) of 17.88% for P(DTCDI-2T) ETL based devices. Moreover, thanks to better film features, more effective interfacial passivation, lower trap-state density and hydrophobicity, these polymeric ETL based devices exhibit considerably improved stability.