Surface and optical properties of phase-pure silver iodobismuthate nanocrystals

Anastasia Matuhina, G. Krishnamurthy Grandhi, Ashanti Bergonzoni, Laurent Pedesseau, Roberto Grisorio, Shambhavee Annurakshita, Harri Ali-Löytty, Riya Varghese, Kimmo Lahtonen, George Volonakis, Vincenzo Pecunia, Godofredo Bautista, Jacky Even, Paola Vivo

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Abstract

The study of surface defects is one of the forefronts of halide perovskite research. In the nanoscale regime, where the surface-to-volume ratio is high, the surface plays a key role in determining the electronic properties of perovskites. Perovskite-inspired silver iodobismuthates are promising photovoltaic absorbers. Herein, we demonstrate the colloidal synthesis of phase pure and highly crystalline AgBiI4 nanocrystals (NCs). Surface-sensitive spectroscopic techniques reveal the rich surface features of the NCs that enable their impressive long-term environmental and thermal stabilities. Notably, the surface termination and its passivation effects on the electronic properties of AgBiI4 are investigated. Our atomistic simulations suggest that a bismuth iodide-rich surface, as in the case of AgBiI4 NCs, does not introduce surface trap states within the band gap region of AgBiI4, unlike a silver iodide-rich surface. These findings may encourage the investigation of surfaces of other lead-free perovskite-inspired materials.

Original languageEnglish
Pages (from-to)14764-14773
Number of pages10
JournalNanoscale
Volume15
Issue number36
DOIs
Publication statusPublished - 22 Aug 2023
Publication typeA1 Journal article-refereed

Publication forum classification

  • Publication forum level 3

ASJC Scopus subject areas

  • General Materials Science

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