Fine-tuned crystallinity of polymerized non-fullerene acceptor via molecular engineering towards efficient all-polymer solar cell

Yuxiang Li, Mei Wang, Qilin Zhang, Ziang Wu, Hyojin Lim, Yingying Wang, Hongmei Qin, Jianye Yang, Chao Gao, Han Young Woo, Jianyu Yuan

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Despite remarkable advancement made by virtue of “polymerized non-fullerene acceptor” strategy in all-polymer solar cells (all-PSCs) recently, the tuning of polymer crystallinity via molecular design to optimize the nanostructured blend morphology remains challenging for boosting the short-circuit current density (JSC). Herein, through systematically optimizing the central core and π-spacer, we present a facile method to regulate the solid-state crystallinity of these emerging polymer acceptors. Specifically, we have synthesized a new family of polymerized non-fullerene acceptors named PY-2T and PY-2T2Cl by copolymerizing the Y5-derivative with bithiophene or chlorinated bithiophene. Compared to the previously used IDIC-based polymer named PIDIC-2T, the extended D-A-D fused ring core renders PY-2T with significantly red-shifted optical absorption and up-shifted energy levels, leading to simultaneously improved JSC and open circuit voltage (VOC) in the resultant all-PSCs. More importantly, the chlorinated PY-2T (PY-2T2Cl) endows the desirable phase separated blend morphology with favorable film crystallinity when paired with polymer donor PBDB-T, thus PY-2T2Cl based all-PSCs delivers a promising power conversion efficiency of approaching ~10% with a greatly enhanced JSC of 16.3 mA/cm2 and high VOC of 0.87 eV. This systematic study provides an insight into the effect of central core and π-spacer on the film crystallinity for developing high-performance polymerized non-fullerene acceptors, and also highlights the importance of both absorption and morphology in boosting the desired JSC in all-PSCs.

Original languageEnglish
Article number131232
JournalChemical Engineering Journal
Volume428
DOIs
Publication statusPublished - 2022 Jan 15

Keywords

  • All-polymer solar cells
  • Central core
  • Chlorinated π-spacer
  • Photovoltaic performance
  • Polymerized non-fullerene acceptor

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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