10.13% Efficiency All-Polymer Solar Cells Enabled by Improving the Optical Absorption of Polymer Acceptors
Artikel i vetenskaplig tidskrift, 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
optical absorption
carbon–oxygen bridging
all-polymer solar cells
power conversion efficiencies
Författare
Qunping Fan
Chalmers, Kemi och kemiteknik, Tillämpad kemi
Ruijie Ma
Hong Kong University of Science and Technology
Tao Liu
Hong Kong University of Science and Technology
Wenyan Su
Chalmers, Kemi och kemiteknik, Tillämpad kemi
Jinan University
Wenhong Peng
Chalmers, Kemi och kemiteknik, Tillämpad kemi
Changzhou University
Ming Zhang
Shanghai Jiao Tong University
Zaiyu Wang
Shanghai Jiao Tong University
Xin Wen
Chalmers, Kemi och kemiteknik, Tillämpad kemi
Zhiyuan Cong
Chalmers, Kemi och kemiteknik, Tillämpad kemi
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
Aalborg Universitet
Sino-Danish Center for Education and Research Denmark
He Yan
Hong Kong University of Science and Technology
Ergang Wang
Chalmers, Kemi och kemiteknik, Tillämpad kemi
Zhengzhou University
Solar RRL
2367198X (eISSN)
Vol. 4 6 2000142Ämneskategorier
Polymerkemi
Atom- och molekylfysik och optik
Den kondenserade materiens fysik
DOI
10.1002/solr.202000142