Over 14% efficiency all-polymer solar cells enabled by a low bandgap polymer acceptor with low energy loss and efficient charge separation
Artikel i vetenskaplig tidskrift, 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

Författare

Qunping Fan

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Qiaoshi An

Beijing Institute of Technology

Y. B. Lin

King Abdullah University of Science and Technology (KAUST)

Y. X. Xia

Linköpings universitet

Qian Li

Nanjing University

Ming Zhang

Shanghai Jiao Tong University

Wenyan Su

Karlstads universitet

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 Universitet

Sino-Danish Center for Education and Research Denmark

Min Xiao

Nanjing University

Ellen Moons

Karlstads universitet

Fujun Zhang

Beijing Jiaotong University

Thomas D. Anthopoulos

King Abdullah University of Science and Technology (KAUST)

O.W. Inganäs

Linköpings universitet

Ergang Wang

Zhengzhou University

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Ergang Wang Group

Energy and Environmental Sciences

1754-5692 (ISSN)

Vol. 13 12 5017-5027

Ämneskategorier

Annan fysik

Annan kemi

Den kondenserade materiens fysik

DOI

10.1039/d0ee01828g

Mer information

Senast uppdaterat

2021-01-21