Premium
Effects of photo‐induced defects on the performance of PBDTTT‐C/PC 70 BM solar cells
Author(s) -
Ning Yu,
Lv Longfeng,
Lu Yunzhang,
Zhang Chunmei,
Fang Yi,
Tang Aiwei,
Hu Yufeng,
Lou Zhidong,
Teng Feng,
Hou Yanbing
Publication year - 2015
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201409539
Subject(s) - materials science , polymer solar cell , alkyl , photodegradation , acceptor , capacitance , thiophene , electrode , organic solar cell , energy conversion efficiency , photochemistry , polymer , chemistry , optoelectronics , organic chemistry , catalysis , composite material , physics , photocatalysis , condensed matter physics
In this work, the effects of photo‐induced defects on polymer solar cells (PSCs) based on the blends of poly (4,8‐bis‐alkyloxybenzo (1,2‐b:4,5‐b′) dithiophene‐2,6‐diyl‐alt‐(alkyl thieno(3,4‐b) thiophene‐2‐carboxylate)‐2,6‐diyl) (PBDTTT‐C) and [6,6]‐phenyl C 70 ‐butyric acid methyl ester (PC 70 BM) are investigated. In addition to conventional PSC characterization approaches, the capacitance–voltage ( C–V ) response and the ideality factor are used to analyze the changes in the built‐in potential and defect‐induced recombination at the internal donor/acceptor interface and the electrode interfaces in illuminated PSCs. The results show that the dominant trap states increase with increasing illumination time, which indicates that photo‐induced defects play an important role in the photodegradation of inverted PSCs. (© 2015 WILEY‐VCH Verlag GmbH &Co. KGaA, Weinheim)