10.13% Efficiency All-Polymer Solar Cells Enabled by Improving the Optical Absorption of Polymer Acceptors

Qunping Fan, Ruijie Ma, Tao Liu*, Wenyan Su, Wenhong Peng, Ming Zhang, Zaiyu Wang, Xin Wen, Zhiyuan Cong, Zhenghui Luo, Lintao Hou, Feng Liu, Weiguo Zhu, Donghong Yu, He Yan, Ergang Wang

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

43 Citations (Scopus)
38 Downloads (Pure)

Abstract

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.

Original languageEnglish
Article number2000142
JournalSolar RRL
Volume4
Issue number6
Number of pages7
DOIs
Publication statusPublished - 1 Jun 2020

Keywords

  • all-polymer solar cells
  • carbon–oxygen bridging
  • optical absorption
  • polymer acceptors
  • power conversion efficiencies

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