TY - JOUR
T1 - Non-Fullerene Organic Solar Cells Based on Benzo[1,2-b:4,5-b′]difuran-Conjugated Polymer with 14% Efficiency
AU - Li, Xueshan
AU - Weng, Kangkang
AU - Ryu, Hwa Sook
AU - Guo, Jing
AU - Zhang, Xuning
AU - Xia, Tian
AU - Fu, Huiting
AU - Wei, Donghui
AU - Min, Jie
AU - Zhang, Yuan
AU - Woo, Han Young
AU - Sun, Yanming
N1 - Funding Information:
This work was financially supported by the National Natural Science Foundation of China (NSFC. grant nos 21674007, 51825301, and 21734001). H.Y.W. is grateful for the financial support from the National Research Foundation (NRF) of Korea (NRF-2016M1A2A2940911 and 2019R1A6A1A11044070). Figure 1 was updated on February 5, 2020, after initial online publication.
PY - 2020/2/1
Y1 - 2020/2/1
N2 - The development of high-performance donor polymers is important for obtaining high power conversion efficiencies (PCEs) of non-fullerene polymer solar cells (PSCs). Currently, most high-efficiency PSCs are fabricated with benzo[1,2-b:4,5-b′]dithiophene (BDT)-based conjugated polymers. The photovoltaic performance of benzo[1,2-b:4,5-b′]difuran (BDF)-based copolymers has lagged far behind that of BDT-based counterparts. In this study, a novel BDF-based copolymer L2 is designed and synthesized, in which BDF and benzotriazole (BTz) building blocks have been used as the electron-sufficient and deficient units, respectively. When blending with a non-fullerene small molecule acceptor (SMA), TTPT-T-4F, the L2-based device exhibits a remarkably high PCE of 14.0%, which is higher than that of the device fabricated by its analogue BDT copolymer (12.72%). Moreover, PSCs based on the L2:TTPT-T-4F blend demonstrate excellent ambient stability with 92% of its original PCE remaining after storage in air for 1800 h. Thus, BDF is a promising electron-donating unit, and the BDF-based copolymers can be competitive or even surpass the performance of BDT-based counterparts.
AB - The development of high-performance donor polymers is important for obtaining high power conversion efficiencies (PCEs) of non-fullerene polymer solar cells (PSCs). Currently, most high-efficiency PSCs are fabricated with benzo[1,2-b:4,5-b′]dithiophene (BDT)-based conjugated polymers. The photovoltaic performance of benzo[1,2-b:4,5-b′]difuran (BDF)-based copolymers has lagged far behind that of BDT-based counterparts. In this study, a novel BDF-based copolymer L2 is designed and synthesized, in which BDF and benzotriazole (BTz) building blocks have been used as the electron-sufficient and deficient units, respectively. When blending with a non-fullerene small molecule acceptor (SMA), TTPT-T-4F, the L2-based device exhibits a remarkably high PCE of 14.0%, which is higher than that of the device fabricated by its analogue BDT copolymer (12.72%). Moreover, PSCs based on the L2:TTPT-T-4F blend demonstrate excellent ambient stability with 92% of its original PCE remaining after storage in air for 1800 h. Thus, BDF is a promising electron-donating unit, and the BDF-based copolymers can be competitive or even surpass the performance of BDT-based counterparts.
KW - ambient stability
KW - benzo[1,2-b:4; 5-b′]difuran
KW - copolymer
KW - organic solar cells
KW - power conversion efficiency
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U2 - 10.1002/adfm.201906809
DO - 10.1002/adfm.201906809
M3 - Article
AN - SCOPUS:85075520036
VL - 30
JO - Advanced Functional Materials
JF - Advanced Functional Materials
SN - 1616-301X
IS - 6
M1 - 1906809
ER -
