Surface photovoltage spectroscopy study of reduced and oxidized nanocrystalline TiO2 films

A. Rothschild; A. Levakov; Y. Shapira; N. Ashkenasy; Y. Komem

doi:10.1016/S0039-6028(03)00154-7

Surface photovoltage spectroscopy study of reduced and oxidized nanocrystalline TiO₂ films

A. Rothschild^*, A. Levakov, Y. Shapira, N. Ashkenasy, Y. Komem

^*Corresponding author for this work

Department of Electrical Engineering - Physical Eng.

Research output: Contribution to journal › Conference article › peer-review

63 Scopus citations

Abstract

Nanocrystalline TiO₂ films used for gas sensors have been studied by means of surface photovoltage spectroscopy and other analytical tools to investigate the oxygen chemisorption effect on the electrical properties of the films. The results show that the surface (and intergranular interface) band bending increases with oxygen exposure due to electron trapping at midgap states induced by chemisorption. The surface electronic structure is revealed by the measurements, allowing determination of the sensing mechanism of these important films. In addition, a photoinduced chemisorption of oxygen at room temperature is observed. This has important implications for low-temperature gas sensors.

Original language	English
Pages (from-to)	456-460
Number of pages	5
Journal	Surface Science
Volume	532-535
DOIs	https://doi.org/10.1016/S0039-6028(03)00154-7
State	Published - 10 Jun 2003
Event	Proceedings of the 7th International Conference on Nanometer - Malmo, Sweden Duration: 29 Aug 2002 → 31 Aug 2002

Keywords

Chemisorption
Interface states
Polycrystalline thin films
Surface electronic phenomena (work function, surface potential, surface states, etc.)
Surface photovoltage
Titanium oxide

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10.1016/S0039-6028(03)00154-7

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title = "Surface photovoltage spectroscopy study of reduced and oxidized nanocrystalline TiO2 films",

abstract = "Nanocrystalline TiO2 films used for gas sensors have been studied by means of surface photovoltage spectroscopy and other analytical tools to investigate the oxygen chemisorption effect on the electrical properties of the films. The results show that the surface (and intergranular interface) band bending increases with oxygen exposure due to electron trapping at midgap states induced by chemisorption. The surface electronic structure is revealed by the measurements, allowing determination of the sensing mechanism of these important films. In addition, a photoinduced chemisorption of oxygen at room temperature is observed. This has important implications for low-temperature gas sensors.",

keywords = "Chemisorption, Interface states, Polycrystalline thin films, Surface electronic phenomena (work function, surface potential, surface states, etc.), Surface photovoltage, Titanium oxide",

author = "A. Rothschild and A. Levakov and Y. Shapira and N. Ashkenasy and Y. Komem",

note = "Funding Information: The authors wish to thank Prof. Frederic Cosandey (Rutgers University) for supplying the TiO 2 samples for this study. YS is grateful to Dinah and Henry Krongold for their generous support. YK is grateful for the Fund for the Promotion of Research at the Technion for partial support.; Proceedings of the 7th International Conference on Nanometer ; Conference date: 29-08-2002 Through 31-08-2002",

year = "2003",

month = jun,

day = "10",

doi = "10.1016/S0039-6028(03)00154-7",

language = "אנגלית",

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journal = "Surface Science",

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TY - JOUR

T1 - Surface photovoltage spectroscopy study of reduced and oxidized nanocrystalline TiO2 films

AU - Rothschild, A.

AU - Levakov, A.

AU - Shapira, Y.

AU - Ashkenasy, N.

AU - Komem, Y.

N1 - Funding Information: The authors wish to thank Prof. Frederic Cosandey (Rutgers University) for supplying the TiO 2 samples for this study. YS is grateful to Dinah and Henry Krongold for their generous support. YK is grateful for the Fund for the Promotion of Research at the Technion for partial support.

PY - 2003/6/10

Y1 - 2003/6/10

N2 - Nanocrystalline TiO2 films used for gas sensors have been studied by means of surface photovoltage spectroscopy and other analytical tools to investigate the oxygen chemisorption effect on the electrical properties of the films. The results show that the surface (and intergranular interface) band bending increases with oxygen exposure due to electron trapping at midgap states induced by chemisorption. The surface electronic structure is revealed by the measurements, allowing determination of the sensing mechanism of these important films. In addition, a photoinduced chemisorption of oxygen at room temperature is observed. This has important implications for low-temperature gas sensors.

AB - Nanocrystalline TiO2 films used for gas sensors have been studied by means of surface photovoltage spectroscopy and other analytical tools to investigate the oxygen chemisorption effect on the electrical properties of the films. The results show that the surface (and intergranular interface) band bending increases with oxygen exposure due to electron trapping at midgap states induced by chemisorption. The surface electronic structure is revealed by the measurements, allowing determination of the sensing mechanism of these important films. In addition, a photoinduced chemisorption of oxygen at room temperature is observed. This has important implications for low-temperature gas sensors.

KW - Chemisorption

KW - Interface states

KW - Polycrystalline thin films

KW - Surface electronic phenomena (work function, surface potential, surface states, etc.)

KW - Surface photovoltage

KW - Titanium oxide

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AN - SCOPUS:0038522648

SN - 0039-6028

VL - 532-535

SP - 456

EP - 460

JO - Surface Science

JF - Surface Science

T2 - Proceedings of the 7th International Conference on Nanometer

Y2 - 29 August 2002 through 31 August 2002

ER -

Surface photovoltage spectroscopy study of reduced and oxidized nanocrystalline TiO₂ films

Abstract

Keywords

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