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Optimized Active Layer Morphologies via Ternary Copolymerization of Polymer Donors for 17.6 % Efficiency Organic Solar Cells with Enhanced Fill Factor
Author(s) -
Guo Xia,
Fan Qunping,
Wu Jingnan,
Li Guangwei,
Peng Zhongxiang,
Su Wenyan,
Lin Ji,
Hou Lintao,
Qin Yunpeng,
Ade Harald,
Ye Long,
Zhang Maojie,
Li Yongfang
Publication year - 2021
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202010596
Subject(s) - active layer , organic solar cell , copolymer , materials science , ternary operation , polymer , energy conversion efficiency , cathode , chemical engineering , layer (electronics) , nanotechnology , photovoltaic system , optoelectronics , chemistry , composite material , computer science , thin film transistor , engineering , programming language , ecology , biology
Regulating molecular structure to optimize the active layer morphology is of considerable significance for improving the power conversion efficiencies (PCEs) in organic solar cells (OSCs). Herein, we demonstrated a simple ternary copolymerization approach to develop a terpolymer donor PM6‐Tz20 by incorporating the 5,5′‐dithienyl‐2,2′‐bithiazole (DTBTz, 20 mol%) unit into the backbone of PM6 (PM6‐Tz00). This method can effectively tailor the molecular orientation and aggregation of the polymer, and then optimize the active layer morphology and the corresponding physical processes of devices, ultimately boosting FF and then PCE. Hence, the PM6‐Tz20: Y6‐based OSCs achieved a PCE of up to 17.1% with a significantly enhanced FF of 0.77. Using Ag (220 nm) instead of Al (100 nm) as cathode, the champion PCE was further improved to 17.6%. This work provides a simple and effective molecular design strategy to optimize the active layer morphology of OSCs for improving photovoltaic performance.