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

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 photoel...

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Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2023-01, Vol.25 (2), p.932-935
Main Authors: Cheng, Pujia, Lv, Wenjing, Shi, Zhili, Zhan, Kaidong, Liu, Yaqi, Quinn, Qiao, Wu, Fan
Format: Article
Language:English
Subjects:
Aqueous solutions
Bias
Charge efficiency
Charge transfer
Charge transport
Diffusion length
Electric fields
Electron transfer
Heterojunctions
Photoelectric effect
Photoelectric emission
Titanium dioxide
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Summary: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.
ISSN:1463-9076
1463-9084
DOI:10.1039/d2cp04552d