TY - JOUR
T1 - Visible-Light Photocurrent in Nanostructured High-Pressure TiO2-II (Columbite) Phase
AU - Wang, Qing
AU - Watanabe, Motonori
AU - Edalati, Kaveh
N1 - Funding Information:
This work is supported in part by WPI-I2CNER, Japan, and in part by grants-in-aid for scientific research from the MEXT, Japan (Nos. 16H04539 and 19H05176).
Publisher Copyright:
© 2020 American Chemical Society.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/6/25
Y1 - 2020/6/25
N2 - 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.
AB - 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.
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U2 - 10.1021/acs.jpcc.0c03923
DO - 10.1021/acs.jpcc.0c03923
M3 - Article
AN - SCOPUS:85087810734
VL - 124
SP - 13930
EP - 13935
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 25
ER -