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

Qing Wang; Motonori Watanabe; Kaveh Edalati

doi:10.1021/acs.jpcc.0c03923

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

Qing Wang, Motonori Watanabe, Kaveh Edalati

研究成果: Contribution to journal › Article › 査読

2 被引用数 (Scopus)

抄録

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.

本文言語	英語
ページ（範囲）	13930-13935
ページ数	6
ジャーナル	Journal of Physical Chemistry C
巻	124
号	25
DOI	https://doi.org/10.1021/acs.jpcc.0c03923
出版ステータス	出版済み - 6 25 2020

All Science Journal Classification (ASJC) codes

電子材料、光学材料、および磁性材料
エネルギー（全般）
物理化学および理論化学
表面、皮膜および薄膜

UN SDG

この成果は、次の持続可能な開発目標に貢献しています

文献へのアクセス

10.1021/acs.jpcc.0c03923

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引用スタイル

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title = "Visible-Light Photocurrent in Nanostructured High-Pressure TiO2-II (Columbite) Phase",

abstract = "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. ",

author = "Qing Wang and Motonori Watanabe and Kaveh Edalati",

note = "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: {\textcopyright} 2020 American Chemical Society. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.",

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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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