High-performance all-polymer solar cells enabled by a novel low bandgap non-fully conjugated polymer acceptor
Journal article, 2021

Anon-fully conjugated polymer as a new class of acceptor materials has shown some advantages over its small molecular counterpart when used in photoactive layers for all-polymer solar cells (all-PSCs), despite a low power conversion efficiency (PCE) caused by its narrow absorption spectra. Herein, a novel non-fully conjugated polymer acceptor PFY-2TS with a low bandgap of similar to 1.40 eV was developed, via polymerizing a large pi-fused small molecule acceptor (SMA) building block (namely YBO) with a non-conjugated thioalkyl linkage. Compared with its precursor YBO, PFY-2TS retains a similar low bandgap but a higher LUMO level. Moreover, compared with the structural analog of YBO-based fully conjugated polymer acceptor PFY-DTC, PFY-2TS shows similar absorption spectrum and electron mobility, but significantly different molecular crystallinity and aggregation properties, which results in optimal blend morphology with a polymer donor PBDB-T and better device physical processes in all-PSCs. As a result, PFY-2TS-based all-PSCs achieved a PCE of 12.31% with a small energy loss of 0.56 eV enabled by the reduced non-radiative energy loss (0.24 eV), which is better than that of 11.08% for the PFY-DTC-based ones. Our work clearly demonstrated that non-fully conjugated polymers as a new class of acceptor materials are very promising for the development of high-performance all-PSCs.

non-fully conjugated polymer acceptors

all-polymer solar cells

power conversion efficiency

morphology

energy loss

Author

Qunping Fan

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Ruijie Ma

Hong Kong University of Science and Technology

Tao Liu

Hong Kong University of Science and Technology

Jianwei Yu

Linköping University

Yiqun Xiao

Chinese University of Hong Kong

Wenyan Su

Jinan University

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Ergang Wang Group

Karlstad University

Yuxiang Li

Xian Univ Sci & Technol

Wenhong Peng

Jinan University

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Ergang Wang Group

Tao Guo

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Ergang Wang Group

Zhenghui Luo

Hong Kong University of Science and Technology

Huiliang Sun

Hong Kong University of Science and Technology

Lintao Hou

Jinan University

Weiguo Zhu

Changzhou University

Xinhui Lu

Chinese University of Hong Kong

Feng Gao

Linköping University

Ellen Moons

Karlstad University

Donghong Yu

Sino-Danish Center for Education and Research Denmark

Aalborg University

He Yan

Hong Kong University of Science and Technology

Ergang Wang

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Ergang Wang Group

Science China Chemistry

1674-7291 (ISSN) 1862-2771 (eISSN)

Vol. In Press

Subject Categories

Polymer Chemistry

Textile, Rubber and Polymeric Materials

Materials Chemistry

DOI

10.1007/s11426-021-1020-7

More information

Latest update

7/28/2021