Electronic Coupling Between Perovskite Nanocrystal and Fullerene Modulates Hot Carrier Capture

Yusheng Li, Junke Jiang, Dandan Wang, Dong Liu, Shota Yajima, Hua Li, Akihito Fuchimoto, Hongshi Li, Guozheng Shi, Shuzi Hayase, Shuxia Tao (Corresponding author), Jiangjian Shi, Qingbo Meng (Corresponding author), Chao Ding (Corresponding author), Qing Shen (Corresponding author)

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

The efficient harnessing of hot carriers holds transformative potential for next-generation optoelectronic devices. Halide perovskites, with their remarkably long carrier lifetimes exceeding 10 picoseconds, stand at the forefront of this research frontier. Yet, a fundamental paradox persists: why does efficient hot carrier capture remain elusive despite these extended lifetimes? Here, this conundrum is unraveled by constructing a donor–acceptor model system: perovskite nanocrystal and fullerene hybrids. It is demonstrated that the challenge lies not only in the carrier lifetime itself but in the nature of the coupling between donor and acceptor components. Remarkably, it is discovered that the formation of ground-state complexes, with effective coupling across a wide energy range, not only overcomes the initially forbidden hot carrier capture within these hybrids but also dramatically enhances it, achieving a ≈76% hot carrier capture efficiency. This finding shifts the paradigm of hot carrier capture from extending carrier lifetimes to engineering donor–acceptor coupling, illuminating a path toward practical hot carrier applications.

Original languageEnglish
JournalAdvanced Functional Materials
VolumeXX
Issue numberX
DOIs
Publication statusAccepted/In press - 5 Nov 2024

Bibliographical note

Publisher Copyright:
© 2024 The Author(s). Advanced Functional Materials published by Wiley-VCH GmbH.

Keywords

  • coupling
  • fullerene
  • hot carrier capture
  • interfacial bonding
  • perovskite

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