Narrow-Bandgap Single-Component Polymer Solar Cells with Approaching 9% Efficiency

Siying Li, Xin Yuan, Qilin Zhang, Bin Li, Yuxiang Li, Jianguo Sun, Yifeng Feng, Xuning Zhang, Ziang Wu, Huan Wei, Mei Wang, Yuanyuan Hu, Yuan Zhang, Han Young Woo, Jianyu Yuan, Wanli Ma

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Two narrow-bandgap block conjugated polymers with a (D1–A1)–(D2–A2) backbone architecture, namely PBDB-T-b-PIDIC2T and PBDB-T-b-PTY6, are designed and synthesized for single-component organic solar cells (SCOSCs). Both polymers contain same donor polymer, PBDB-T, but different polymerized nonfullerene molecule acceptors. Compared to all previously reported materials for SCOSCs, PBDB-T-b-PIDIC2T and PBDB-T-b-PTY6 exhibit narrower bandgap for better light harvesting. When incorporated into SCOSCs, the short-circuit current density (Jsc) is significantly improved to over 15 mA cm−2, together with a record-high power conversion efficiency (PCE) of 8.64%. Moreover, these block copolymers exhibit low energy loss due to high charge transfer (CT) states (Ect) plus small non-radiative loss (0.26 eV), and improved stability under both ambient condition and continuous 80 °C thermal stresses for over 1000 h. Determination of the charge carrier dynamics and film morphology in these SCOSCs reveals increased carrier recombination, relative to binary bulk-heterojunction devices, which is mainly due to reduced ordering of both donor and acceptor fragments. The close structural relationship between block polymers and their binary counterparts also provides an excellent framework to explore further molecular features that impact the photovoltaic performance and boost the state-of-the-art efficiency of SCOSCs.

Original languageEnglish
Article number2101295
JournalAdvanced Materials
Volume33
Issue number32
DOIs
Publication statusPublished - 2021 Aug 12

Keywords

  • low energy loss
  • narrow bandgap
  • single-component polymer solar cells
  • stability

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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