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

carbon–oxygen bridging

all-polymer solar cells

optical absorption

power conversion efficiencies

Författare

Qunping Fan

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

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, Ergang Wang Group

Jinan University

Wenhong Peng

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

Changzhou University

Ming Zhang

Shanghai Jiao Tong University

Zaiyu Wang

Shanghai Jiao Tong University

Xin Wen

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

Zhiyuan Cong

Xi'an Modern Chemistry Research Institute

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

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 (SDC)

Aalborg Universitet

He Yan

Hong Kong University of Science and Technology

Ergang Wang

Zhengzhou University

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

Solar RRL

2367198X (eISSN)

Vol. 4 6 2000142

Ämneskategorier

Polymerkemi

Atom- och molekylfysik och optik

Annan kemi

DOI

10.1002/solr.202000142

Mer information

Senast uppdaterat

2020-09-14