Visible-Light Photocurrent in Nanostructured High-Pressure TiO2‑II (Columbite) Phase

Titanium oxide (TiO2), with the anatase and rutile structures, has been widely studied for photovoltaic and solar cell applications, but its main drawback is large bandgap, which limits its activity to the UV light region. In this study, a high-pressure TiO2-II (columbite) phase, which has already b...

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Published in:Journal of physical chemistry. C 2020-06, Vol.124 (25), p.13930-13935
Main Authors: Wang, Qing, Watanabe, Motonori, Edalati, Kaveh
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Language:English
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C: Plasmonics
Optical, Magnetic, and Hybrid Materials
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Watanabe, Motonori
Edalati, Kaveh
description Titanium oxide (TiO2), with the anatase and rutile structures, has been widely studied for photovoltaic and solar cell applications, but its main drawback is large bandgap, which limits its activity to the UV light region. In this study, a high-pressure TiO2-II (columbite) phase, which has already been suggested to have low bandgap with downward-shifted Fermi level, is stabilized by the high-pressure torsion (HPT) method and its photovoltaic activity is examined. The TiO2-II formation by HPT processing leads to photocurrent generation under visible light, while the visible-light photocurrent is enhanced further after the recovery of oxygen vacancies by thermal annealing.
doi_str_mv 10.1021/acs.jpcc.0c03923
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subjects C: Plasmonics
Optical, Magnetic, and Hybrid Materials
title Visible-Light Photocurrent in Nanostructured High-Pressure TiO2‑II (Columbite) Phase
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