Retarded Charge Recombination to Enhance Photocatalytic Performance for Water-Free CO2Reduction Using Perovskite Nanocrystals as Photocatalysts

Sudhakar Narra, Sumit S. Bhosale, Aparna K. Kharade, Sue Min Chang, Eric Wei Guang Diau*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Femtosecond transient absorption spectral (TAS) investigations were performed to understand the carrier relaxation mechanism for perovskite nanocrystals Cs1-xFAxPbBr3(CF, x = 0.45) and CsPbBr3(CS), which served as efficient photocatalysts for splitting of CO2into CO and O2in the absence of water. Upon light irradiation for 12 h, formation of deep trap states was found for both CS and CF samples with spectral characteristics of the TAS photobleach (PB) band showing a long spectral tail extending to the long wavelength region. The charge recombination rates at the shallow surface states, bulk states, and deep-trapped surface state were found to be significantly retarded for the CF sample than for the CS sample, in agreement with the photocatalytic performances for CO product yields of the CF catalyst being greater by a factor of 3 compared to those of the CS catalyst.

Original languageEnglish
Pages (from-to)9134-9139
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume13
Issue number39
DOIs
StatePublished - 6 Oct 2022

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