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


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, Ergang Wang Group

Energy and Environmental Sciences

1754-5692 (ISSN)

Vol. 13 12 5017-5027

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