10.13% Efficiency All-Polymer Solar Cells Enabled by Improving the Optical Absorption of Polymer Acceptors
Journal article, 2020
The limited light absorption capacity for most polymer acceptors hinders the improvement of the power conversion efficiency (PCE) of all-polymer solar cells (all-PSCs). Herein, by simultaneously increasing the conjugation of the acceptor unit and enhancing the electron-donating ability of the donor unit, a novel narrow-bandgap polymer acceptor PF3-DTCO based on an A–D–A-structured acceptor unit ITIC16 and a carbon–oxygen (C–O)-bridged donor unit DTCO is developed. The extended conjugation of the acceptor units from IDIC16 to ITIC16 results in a red-shifted absorption spectrum and improved absorption coefficient without significant reduction of the lowest unoccupied molecular orbital energy level. Moreover, in addition to further broadening the absorption spectrum by the enhanced intramolecular charge transfer effect, the introduction of C–O bridges into the donor unit improves the absorption coefficient and electron mobility, as well as optimizes the morphology and molecular order of active layers. As a result, the PF3-DTCO achieves a higher PCE of 10.13% with a higher short-circuit current density (Jsc) of 15.75 mA cm−2 in all-PSCs compared with its original polymer acceptor PF2-DTC (PCE = 8.95% and Jsc = 13.82 mA cm−2). Herein, a promising method is provided to construct high-performance polymer acceptors with excellent optical absorption for efficient all-PSCs.
polymer acceptors
power conversion efficiencies
optical absorption
all-polymer solar cells
carbon–oxygen bridging
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
Wenyan Su
Jinan University
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
Wenhong Peng
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
Changzhou University
Ming Zhang
Shanghai Jiao Tong University
Zaiyu Wang
Shanghai Jiao Tong University
Xin Wen
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
Zhiyuan Cong
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
Xi'an Modern Chemistry Research Institute
Zhenghui Luo
Hong Kong University of Science and Technology
Lintao Hou
Jinan University
Feng Liu
Shanghai Jiao Tong University
W. G. Zhu
Changzhou 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
Zhengzhou University
Solar RRL
2367198X (eISSN)
Vol. 4 6 2000142Subject Categories (SSIF 2011)
Polymer Chemistry
Atom and Molecular Physics and Optics
Condensed Matter Physics
DOI
10.1002/solr.202000142