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Effects of the Molecular Weight and the Side‐Chain Length on the Photovoltaic Performance of Dithienosilole/Thienopyrrolodione Copolymers
Author(s) -
Chu TaYa,
Lu Jianping,
Beaupré Serge,
Zhang Yanguang,
Pouliot JeanRémi,
Zhou Jiayun,
Najari Ahmed,
Leclerc Mario,
Tao Ye
Publication year - 2012
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201102623
Subject(s) - materials science , polymer solar cell , photocurrent , copolymer , energy conversion efficiency , photovoltaic system , polymer , side chain , alkyl , band gap , equivalent series resistance , quantum efficiency , solar cell , chemical engineering , polymer chemistry , optoelectronics , organic chemistry , composite material , ecology , chemistry , physics , quantum mechanics , voltage , engineering , biology
A series of low‐bandgap alternating copolymers of dithienosilole and thienopyrrolodione (PDTSTPDs) are prepared to investigate the effects of the polymer molecular weight and the alkyl chain length of the thienopyrrole‐4,6‐dione (TPD) unit on the photovoltaic performance. High‐molecular‐weight PDTSTPD leads to a higher hole mobility, lower device series resistance, a larger fill factor, and a higher photocurrent in PDTSTPD:[6,6]‐phenyl C 71 butyric acid methyl ester (PC 71 BM) bulk‐heterojunction solar cells. Different side‐chain lengths show a significant impact on the interchain packing between polymers and affect the blend film morphology due to different solubilities. A high power conversion efficiency of 7.5% is achieved for a solar cell with a 1.0 cm 2 active area, along with a maximum external quantum efficiency (EQE) of 63% in the red region.