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A High‐Performance D–A Copolymer Based on Dithieno[3,2‐b:2′,3′‐d]Pyridin‐5(4H)‐One Unit Compatible with Fullerene and Nonfullerene Acceptors in Solar Cells
Author(s) -
An Mingwei,
Xie Fangyuan,
Geng Xinjian,
Zhang Jianqi,
Jiang Jiaxing,
Lei Zhongli,
He Dan,
Xiao Zuo,
Ding Liming
Publication year - 2017
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201602509
Subject(s) - materials science , copolymer , fullerene , acceptor , ternary operation , organic solar cell , polymer solar cell , energy conversion efficiency , chemical engineering , polymer , polymer chemistry , optoelectronics , organic chemistry , composite material , chemistry , physics , computer science , engineering , programming language , condensed matter physics
Development of high‐performance donor–acceptor (D–A) copolymers is vital in the research of polymer solar cells (PSCs). In this work, a low‐bandgap D–A copolymer based on dithieno[3,2‐b:2′,3′‐d]pyridin‐5(4H)‐one unit (DTP), PDTP4TFBT, is developed and used as the donor material for PSCs with PC 71 BM or ITIC as the acceptor. PDTP4TFBT:PC 71 BM and PDTP4TFBT:ITIC solar cells give power conversion efficiencies (PCEs) up to 8.75% and 7.58%, respectively. 1,8‐Diiodooctane affects film morphology and device performance for fullerene and nonfullerene solar cells. It inhibits the active materials from forming large domains and improves PCE for PDTP4TFBT:PC 71 BM cells, while it promotes the aggregation and deteriorates performance for PDTP4TFBT:ITIC cells. The ternary‐blend cells based on PDTP4TFBT:PC 71 BM:ITIC (1:1.2:0.3) give a decent PCE of 9.20%.
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