TY - JOUR
T1 - Eco-Compatible Solvent-Processed Organic Photovoltaic Cells with Over 16% Efficiency
AU - Hong, Ling
AU - Yao, Huifeng
AU - Wu, Ziang
AU - Cui, Yong
AU - Zhang, Tao
AU - Xu, Ye
AU - Yu, Runnan
AU - Liao, Qing
AU - Gao, Bowei
AU - Xian, Kaihu
AU - Woo, Han Young
AU - Ge, Ziyi
AU - Hou, Jianhui
N1 - Funding Information:
J.H. would like to acknowledge the financial support from the National Natural Science Foundation of China (91633301 51673201, and 21835006), the Chinese Academy of Sciences (XDB12030200). This work was supported by Beijing National Laboratory for Molecular Sciences (BNLMS-CXXM-201903). H.Y. thanks the financial support from the National Natural Science Foundation of China (21805287) and the Youth Innovation Promotion Association CAS (No. 2018043). H.Y.W. is grateful for the financial support from the National Research Foundation (NRF) of Korea (2016M1A2A2940911, 2019R1A6A1A11044070). Z.G. thanks the financial support from National Key R&D Program of China (2017YFE0106000) and Ningbo Municipal Science and Technology Innovative Research Team (2015B11002 and 2016B10005).
Publisher Copyright:
© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2019/9/1
Y1 - 2019/9/1
N2 - Recent advances in nonfullerene acceptors (NFAs) have enabled the rapid increase in power conversion efficiencies (PCEs) of organic photovoltaic (OPV) cells. However, this progress is achieved using highly toxic solvents, which are not suitable for the scalable large-area processing method, becoming one of the biggest factors hindering the mass production and commercial applications of OPVs. Therefore, it is of great importance to get good eco-compatible processability when designing efficient OPV materials. Here, to achieve high efficiency and good processability of the NFAs in eco-compatible solvents, the flexible alkyl chains of the highly efficient NFA BTP-4F-8 (also known as Y6) are modified and BTP-4F-12 is synthesized. Combining with the polymer donor PBDB-TF, BTP-4F-12 shows the best PCE of 16.4%. Importantly, when the polymer donor PBDB-TF is replaced by T1 with better solubility, various eco-compatible solvents can be applied to fabricate OPV cells. Finally, over 14% efficiency is obtained with tetrahydrofuran (THF) as the processing solvent for 1.07 cm2 OPV cells by the blade-coating method. These results indicate that the simple modification of the side chain can be used to tune the processability of active layer materials and thus make it more applicable for the mass production with environmentally benign solvents.
AB - Recent advances in nonfullerene acceptors (NFAs) have enabled the rapid increase in power conversion efficiencies (PCEs) of organic photovoltaic (OPV) cells. However, this progress is achieved using highly toxic solvents, which are not suitable for the scalable large-area processing method, becoming one of the biggest factors hindering the mass production and commercial applications of OPVs. Therefore, it is of great importance to get good eco-compatible processability when designing efficient OPV materials. Here, to achieve high efficiency and good processability of the NFAs in eco-compatible solvents, the flexible alkyl chains of the highly efficient NFA BTP-4F-8 (also known as Y6) are modified and BTP-4F-12 is synthesized. Combining with the polymer donor PBDB-TF, BTP-4F-12 shows the best PCE of 16.4%. Importantly, when the polymer donor PBDB-TF is replaced by T1 with better solubility, various eco-compatible solvents can be applied to fabricate OPV cells. Finally, over 14% efficiency is obtained with tetrahydrofuran (THF) as the processing solvent for 1.07 cm2 OPV cells by the blade-coating method. These results indicate that the simple modification of the side chain can be used to tune the processability of active layer materials and thus make it more applicable for the mass production with environmentally benign solvents.
KW - blade-coating
KW - eco-compatible solvents
KW - nonfullerene acceptors
KW - organic photovoltaic cells
KW - power conversion efficiency
UR - http://www.scopus.com/inward/record.url?scp=85070501978&partnerID=8YFLogxK
U2 - 10.1002/adma.201903441
DO - 10.1002/adma.201903441
M3 - Article
C2 - 31392768
AN - SCOPUS:85070501978
SN - 0935-9648
VL - 31
JO - Advanced Materials
JF - Advanced Materials
IS - 39
M1 - 1903441
ER -
