Charge transport dynamics of a C6H4NH2CuBr2I/TiO2 heterojunction in aqueous solution under reverse bias

Pujia Cheng, Wenjing Lv, Zhili Shi, Kaidong Zhan, Yaqi Liu, Quinn Qiao, Fan Wu

Research output: Contribution to journalArticlepeer-review

Abstract

The photocurrent output of the C6H4NH2CuBr2I/TiO2 heterojunction photoelectrode in an aqueous solution is super stable even after 30 000 s. However, the photocurrent is extremely weak. Intensity-modulated photocurrent spectroscopy revealed that the electron transfer in the C6H4NH2CuBr2I/TiO2 photoelectrode without bias is not sufficiently fast to compete with the charge recombination process due to the short diffusion length (∼23 nm), resulting in a low photocurrent. The charge separation and charge transfer efficiency in the bulk of C6H4NH2CuBr2I could be significantly improved under a small reverse electric field (Er), resulting in an enhanced photocurrent.

Original languageEnglish (US)
Pages (from-to)932-935
Number of pages4
JournalPhysical Chemistry Chemical Physics
Volume25
Issue number2
DOIs
StatePublished - Dec 5 2022

ASJC Scopus subject areas

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry

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