Over 14% efficiency all-polymer solar cells enabled by a low bandgap polymer acceptor with low energy loss and efficient charge separation
Journal article, 2020
Obtaining both high open-circuit voltage (Voc) and short-circuit current density (Jsc) has been a major challenge for efficient all-polymer solar cells (all-PSCs). Herein, we developed a polymer acceptor PF5-Y5 with excellent optical absorption capability (onset extending to ∼880 nm and maximum absorption coefficient exceeding 105 cm-1 in a film), high electron mobility (3.18 × 10-3 cm2 V-1 s-1) and high LUMO level (-3.84 eV) to address such a challenge. As a result, the PBDB-T:PF5-Y5-based all-PSCs achieved a high power conversion efficiency of up to 14.45% with both a high Voc (0.946 V) and a high Jsc (20.65 mA cm-2), due to the high and broad absorption coverage, small energy loss (0.57 eV) and efficient charge separation and transport in the device, which are among the best values in the all-PSC field. In addition, the all-PSC shows a ∼15% improvement in PCE compared to its counterpart small molecule acceptor (Y5)-based device. Our results suggest that PF5-Y5 is a very promising polymer acceptor candidate for applications in efficient all-PSCs. This journal is
Author
Qunping Fan
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
Qiaoshi An
Beijing Institute of Technology
Y. B. Lin
King Abdullah University of Science and Technology (KAUST)
Y. X. Xia
Linköping University
Qian Li
Nanjing University
Ming Zhang
Shanghai Jiao Tong University
Wenyan Su
Karlstad University
Jinan University
Wenhong Peng
Changzhou University
Chunfeng Zhang
Nanjing University
Feng Liu
Shanghai Jiao Tong University
Lintao Hou
Jinan University
W. G. Zhu
Changzhou University
Donghong Yu
Aalborg University
Sino-Danish Center for Education and Research Denmark
Min Xiao
Nanjing University
Ellen Moons
Karlstad University
Fujun Zhang
Beijing Jiaotong University
Thomas D. Anthopoulos
King Abdullah University of Science and Technology (KAUST)
O.W. Inganäs
Linköping University
Ergang Wang
Zhengzhou University
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
Energy and Environmental Sciences
1754-5692 (ISSN) 17545706 (eISSN)
Vol. 13 12 5017-5027Subject Categories
Other Physics Topics
Other Chemistry Topics
Condensed Matter Physics
DOI
10.1039/d0ee01828g