Correlations among Defect Type, Photoconductivity and Photoreactivity of Doped TiO2

Myong Ho Kim; Soon Il Lee; Tae Kwon Song; Hyunwoong Park; Wonyong Choi; Han Ill Yoo; Tae Gone Park

doi:10.1007/BF02705611

Correlations among Defect Type, Photoconductivity and Photoreactivity of Doped TiO₂

Myong Ho Kim, Soon Il Lee, Tae Kwon Song, Hyunwoong Park, Wonyong Choi, Han Ill Yoo, Tae Gone Park

School of Energy Engineering

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

The electrical conductivity (σ), photoconductivity and photocatalytic reactivity in doped crystalline TiO₂ were measured as a function of the oxygen partial pressure (Po₂), temperature, doping type and UV irradiation. The Po₂ dependence of σ suggests that the predominant atomic defects in pure TiO₂ are oxygen vacancies (V_o^-) and interstitial titanium ions (Ti_i^-), but the dominant defect is changed with Po₂ and temperature. The photoexcited electrons in reduced and/or n-type doped TiO₂ enhance both the photoconductivity and the photocatalytic reactivity by the reduction process. Therefore, these behaviors are strongly dependent on the electron concentration.

Original language	English
Pages (from-to)	873-878
Number of pages	6
Journal	Korean Journal of Chemical Engineering
Volume	18
Issue number	6
DOIs	https://doi.org/10.1007/BF02705611
State	Published - Nov 2001

Keywords

Charge Compensation
Defect Type
Doping Effect
Photoconductivity
Photoreactivity

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10.1007/BF02705611

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title = "Correlations among Defect Type, Photoconductivity and Photoreactivity of Doped TiO2",

abstract = "The electrical conductivity (σ), photoconductivity and photocatalytic reactivity in doped crystalline TiO2 were measured as a function of the oxygen partial pressure (Po2), temperature, doping type and UV irradiation. The Po2 dependence of σ suggests that the predominant atomic defects in pure TiO2 are oxygen vacancies (Vo-) and interstitial titanium ions (Tii-), but the dominant defect is changed with Po2 and temperature. The photoexcited electrons in reduced and/or n-type doped TiO2 enhance both the photoconductivity and the photocatalytic reactivity by the reduction process. Therefore, these behaviors are strongly dependent on the electron concentration.",

keywords = "Charge Compensation, Defect Type, Doping Effect, Photoconductivity, Photoreactivity",

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T1 - Correlations among Defect Type, Photoconductivity and Photoreactivity of Doped TiO2

AU - Kim, Myong Ho

AU - Lee, Soon Il

AU - Song, Tae Kwon

AU - Park, Hyunwoong

AU - Choi, Wonyong

AU - Yoo, Han Ill

AU - Park, Tae Gone

PY - 2001/11

Y1 - 2001/11

N2 - The electrical conductivity (σ), photoconductivity and photocatalytic reactivity in doped crystalline TiO2 were measured as a function of the oxygen partial pressure (Po2), temperature, doping type and UV irradiation. The Po2 dependence of σ suggests that the predominant atomic defects in pure TiO2 are oxygen vacancies (Vo-) and interstitial titanium ions (Tii-), but the dominant defect is changed with Po2 and temperature. The photoexcited electrons in reduced and/or n-type doped TiO2 enhance both the photoconductivity and the photocatalytic reactivity by the reduction process. Therefore, these behaviors are strongly dependent on the electron concentration.

AB - The electrical conductivity (σ), photoconductivity and photocatalytic reactivity in doped crystalline TiO2 were measured as a function of the oxygen partial pressure (Po2), temperature, doping type and UV irradiation. The Po2 dependence of σ suggests that the predominant atomic defects in pure TiO2 are oxygen vacancies (Vo-) and interstitial titanium ions (Tii-), but the dominant defect is changed with Po2 and temperature. The photoexcited electrons in reduced and/or n-type doped TiO2 enhance both the photoconductivity and the photocatalytic reactivity by the reduction process. Therefore, these behaviors are strongly dependent on the electron concentration.

KW - Charge Compensation

KW - Defect Type

KW - Doping Effect

KW - Photoconductivity

KW - Photoreactivity

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DO - 10.1007/BF02705611

M3 - Article

AN - SCOPUS:0035561758

SN - 0256-1115

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SP - 873

EP - 878

JO - Korean Journal of Chemical Engineering

JF - Korean Journal of Chemical Engineering

IS - 6

ER -

Correlations among Defect Type, Photoconductivity and Photoreactivity of Doped TiO₂

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Keywords

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