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A Chlorinated Donor Polymer Achieving High‐Performance Organic Solar Cells with a Wide Range of Polymer Molecular Weight
Author(s) -
Zeng Anping,
Ma Xiaoling,
Pan Mingao,
Chen Yuzhong,
Ma Ruijie,
Zhao Heng,
Zhang Jianquan,
Kim Ha Kyung,
Shang Ao,
Luo Siwei,
Angunawela Indunil Chathurangani,
Chang Yuan,
Qi Zhenyu,
Sun Huiliang,
Lai Joshua Yuk Lin,
Ade Harald,
Ma Wei,
Zhang Fujun,
Yan He
Publication year - 2021
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.202102413
Subject(s) - polymer , materials science , organic solar cell , fullerene , polymer solar cell , chemical engineering , open circuit voltage , polymer chemistry , voltage , organic chemistry , chemistry , composite material , electrical engineering , engineering
In the field of non‐fullerene organic solar cells (OSCs), compared to the rapid development of non‐fullerene acceptors, the progress of high‐performance donor polymers is relatively slow. The property and performance of donor polymers in OSCs are often sensitive to the molecular weight of the polymers. In this study, a chlorinated donor polymer named D18‐Cl is reported, which can achieve high performance with a wide range of polymer molecular weight. The devices based on D18‐Cl show a higher open‐circuit voltage ( V OC ) due to the slightly deeper energy levels and an outstanding short‐circuit current density ( J SC ) owing to the appropriate long periods of blend films and less ([6,6]‐phenyl‐C71‐butyric acid methyl ester) (PC 71 BM) in mixed domains, leading to the higher efficiency of 17.97% than those of the D18‐based devices (17.21%). Meanwhile, D18‐Cl can achieve high efficiencies (17.30–17.97%) when its number‐averaged molecular weight ( M n ) is ranged from 45 to 72 kDa. In contrast, the D18‐based devices only exhibit relatively high efficiencies in a narrow M n range of ≈70 kDa. Such property and performance make D18‐Cl a promising donor polymer for scale‐up and low‐cost production.