Photoinduced small polarons bound to hydrogen defects in rutile TiO2

Photoinduced small polarons bound to hydrogen defects in rutile TiO2 Photoinduced absorption in rutile TiO2 has been studied by means of Fourier transform infrared spectroscopy. It is shown that near-band-gap illumination results in a charge-state transition of a hydrogen defect with an O–H stretch mode at 3500 cm−1, as evidenced by the appearance of an anticorrelated vibrational mode with a blueshift of ∼1.3cm−1. The charge-state transition is accompanied by a broad near-infrared absorption band with maximum intensity at ∼7000cm−1. Our data on both the photoinduced vibrational mode and the near-infrared absorption can be conclusively explained in the framework of a model of small electron polarons bound to a Ti atom adjacent to the O–H group of the hydrogen defect. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

Photoinduced small polarons bound to hydrogen defects in rutile TiO2

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Photoinduced small polarons bound to hydrogen defects in rutile TiO2

Abstract

Photoinduced absorption in rutile TiO2 has been studied by means of Fourier transform infrared spectroscopy. It is shown that near-band-gap illumination results in a charge-state transition of a hydrogen defect with an O–H stretch mode at 3500 cm−1, as evidenced by the appearance of an anticorrelated vibrational mode with a blueshift of ∼1.3cm−1. The charge-state transition is accompanied by a broad near-infrared absorption band with maximum intensity at ∼7000cm−1. Our data on both the photoinduced vibrational mode and the near-infrared absorption can be conclusively explained in the framework of a model of small electron polarons bound to a Ti atom adjacent to the O–H group of the hydrogen defect.
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Publisher
The American Physical Society
Copyright
Copyright © ©2017 American Physical Society
ISSN
1098-0121
eISSN
1550-235X
D.O.I.
10.1103/PhysRevB.96.085203
Publisher site
See Article on Publisher Site

Abstract

Photoinduced absorption in rutile TiO2 has been studied by means of Fourier transform infrared spectroscopy. It is shown that near-band-gap illumination results in a charge-state transition of a hydrogen defect with an O–H stretch mode at 3500 cm−1, as evidenced by the appearance of an anticorrelated vibrational mode with a blueshift of ∼1.3cm−1. The charge-state transition is accompanied by a broad near-infrared absorption band with maximum intensity at ∼7000cm−1. Our data on both the photoinduced vibrational mode and the near-infrared absorption can be conclusively explained in the framework of a model of small electron polarons bound to a Ti atom adjacent to the O–H group of the hydrogen defect.

Journal

Physical Review BAmerican Physical Society (APS)

Published: Aug 7, 2017

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