Multi-Selenophene-Containing Narrow Bandgap Polymer Acceptors for All-Polymer Solar Cells with over 15 % Efficiency and High Reproducibility

Qunping Fan, Huiting Fu, Qiang Wu, Ziang Wu, Francis Lin, Zonglong Zhu, Jie Min, Han Young Woo, Alex K.Y. Jen

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

All-polymer solar cells (all-PSCs) progressed tremendously due to recent advances in polymerized small molecule acceptors (PSMAs), and their power conversion efficiencies (PCEs) have exceeded 15 %. However, the practical applications of all-PSCs are still restricted by a lack of PSMAs with a broad absorption, high electron mobility, low energy loss, and good batch-to-batch reproducibility. A multi-selenophene-containing PSMA, PFY-3Se, was developed based on a selenophene-fused SMA framework and a selenophene π-spacer. Compared to its thiophene analogue PFY-0Se, PFY-3Se shows a ≈30 nm red-shifted absorption, increased electron mobility, and improved intermolecular interaction. In all-PSCs, PFY-3Se achieved an impressive PCE of 15.1 % with both high short-circuit current density of 23.6 mA cm−2 and high fill factor of 0.737, and a low energy loss, which are among the best values in all-PSCs reported to date and much better than PFY-0Se (PCE=13.0 %). Notably, PFY-3Se maintains similarly good batch-to-batch properties for realizing reproducible device performance, which is the first reported and also very rare for the PSMAs. Moreover, the PFY-3Se-based all-PSCs show low dependence of PCE on device area (0.045–1.0 cm2) and active layer thickness (110–250 nm), indicating the great potential toward practical applications.

Original languageEnglish
Pages (from-to)15935-15943
Number of pages9
JournalAngewandte Chemie - International Edition
Volume60
Issue number29
DOIs
Publication statusPublished - 2021 Jul 12

Keywords

  • all-polymer solar cells
  • batch-to-batch insensitivity
  • narrow band gap polymer acceptors
  • power conversion efficiencies
  • selenophene

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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