Multifunctional solid additive enables all-polymer solar cells with improved efficiency, photostability and mechanical durability

Jiali Song, Linglong Ye, Chunhui Liu, Yunhao Cai, Chen Zhang, Gui Chu Yue, Yun Li, Min Hun Jee, Yong Zhao, Donghui Wei, Han Young Woo, Yanming Sun

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

All-polymer solar cells (all-PSCs) have recently made remarkable progress owing to the emergence of polymerized small molecule acceptors. However, the fabrication of all-PSCs featuring high efficiency, desirable photostability and excellent mechanical durability remains challenging. Herein, we designed and synthesized a series of novel non-volatile solid additives, namely DTC-Cn (n is 8, 12 and 16) with a long flexible alkyl chain. It was discovered that the molecular miscibility and phase-separated morphology of PM6 : PY-C11 blend can be finely tuned by introducing DTC additives with different alkyl chain lengths. As a result, the DTC-C12-processed all-PSC produces a maximum efficiency of 18.35% (certified as 17.9%), which is among the highest efficiencies reported for the binary all-PSCs so far. The general applicability of DTC-C12 is further confirmed by using two other all-polymer systems, and the corresponding devices all yield enhanced efficiency. In addition, DTC-C12 can effectively suppress molecular aggregation and material decomposition caused by continuous illumination, which results in superior device photostability (a T80 lifetime of 1120 h). More importantly, the mechanical robustness of the flexible device is also improved with the addition of DTC-C12. This work demonstrates the great potential of utilising non-volatile solid additives with a flexible alkyl main chain to boost the comprehensive performance of all-PSCs.

Original languageEnglish
Pages (from-to)5371-5380
Number of pages10
JournalEnergy and Environmental Science
Volume16
Issue number11
DOIs
Publication statusPublished - 2023 Sept 27

Bibliographical note

Publisher Copyright:
© 2023 The Royal Society of Chemistry

ASJC Scopus subject areas

  • Environmental Chemistry
  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Pollution

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