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10.13% Efficiency All‐Polymer Solar Cells Enabled by Improving the Optical Absorption of Polymer Acceptors
Author(s) -
Fan Qunping,
Ma Ruijie,
Liu Tao,
Su Wenyan,
Peng Wenhong,
Zhang Ming,
Wang Zaiyu,
Wen Xin,
Cong Zhiyuan,
Luo Zhenghui,
Hou Lintao,
Liu Feng,
Zhu Weiguo,
Yu Donghong,
Yan He,
Wang Ergang
Publication year - 2020
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.202000142
Subject(s) - acceptor , absorption (acoustics) , materials science , polymer , polymer solar cell , homo/lumo , intramolecular force , absorption spectroscopy , band gap , photochemistry , attenuation coefficient , absorption band , electron acceptor , energy conversion efficiency , chemistry , optoelectronics , optics , molecule , organic chemistry , physics , composite material , condensed matter physics
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 ( J sc ) of 15.75 mA cm −2 in all‐PSCs compared with its original polymer acceptor PF2‐DTC (PCE = 8.95% and J sc = 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.