Long-lived charge separation in two-dimensional ligand-perovskite heterostructures

Shibin Deng, Jordan M. Snaider, Yao Gao, Enzheng Shi, Linrui Jin, Richard D. Schaller, Letian Dou, Libai Huang*

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Rational design of heterojunctions using nanostructured materials is a useful strategy for achieving efficient interfacial charge separation in photovoltaics. Heterojunctions can be constructed between the organic ligands and the inorganic layers in two-dimensional perovskites, taking advantage of their highly programmable structures. Here, we investigate charge transfer and recombination at the interface between the thiophene-based semiconducting ligands and the lead halide inorganic sublattices using time-resolved photoluminescence and transient reflection spectroscopy in single two-dimensional perovskite crystals. These measurements demonstrate the charge transfer time around 10 ps and long-lived charge-separated state over the nanosecond time scale in two-dimensional ligand-perovskite heterostructures. The efficient charge transfer processes coupled with slow charge recombination suggest the potential for improving exciton dissociation and charge transport in two-dimensional perovskite solar cells.

Original languageEnglish (US)
Article number044711
JournalJournal of Chemical Physics
Volume152
Issue number4
DOIs
StatePublished - Jan 31 2020

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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