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Efficient Non‐Fullerene Organic Solar Cells Based on a Wide‐Bandgap Polymer Donor Containing an Alkylthiophenyl‐Substituted Benzodithiophene Moiety
Author(s) -
Xie Ruihao,
Ying Lei,
An Kang,
Zhong Wenkai,
Yin Qingwu,
Liao Shengzu,
Huang Fei,
Cao Yong
Publication year - 2019
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201900375
Subject(s) - materials science , moiety , fullerene , organic solar cell , energy conversion efficiency , band gap , polymer , polymer solar cell , copolymer , alkoxy group , photochemistry , short circuit , chemical engineering , polymer chemistry , optoelectronics , organic chemistry , chemistry , voltage , alkyl , physics , quantum mechanics , engineering , composite material
Two wide‐bandgap polymer donors containing an alkylthiophenyl substituted benzo[1,2‐ b : 4,5‐ b′ ]dithiophene moiety, namely PTZPO and PTZPS, were designed and synthesized. Both polymers exhibit relatively wide optical bandgap of 1.95 V with similar absorption profiles. The polymer PTZPS with alkylthiophenyl substituted benzo[1,2‐ b : 4,5‐ b′ ]dithiophene units showed enhanced light‐harvesting capabilities, leading to improved short‐circuit current densities. The PTZPS : ITIC film shows more appreciable film morphology and phase separation than the film composed of a blend of ITIC with alkoxyl substitutions containing copolymer PTZPO, which facilitates exciton dissociation and charge transport. The PTZPS : ITIC‐based non‐fullerene organic solar cells show clearly improved short‐circuit current density and an impressively high power conversion efficiency of more than 11 %. These observations demonstrate the great promise of using PTZPS as electron‐donating materials for high‐performance non‐fullerene organic solar cells.