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
UR - http://www.scopus.com/inward/record.url?scp=0038522648&partnerID=8YFLogxK
U2 - 10.1016/S0039-6028(03)00154-7
DO - 10.1016/S0039-6028(03)00154-7
M3 - ???researchoutput.researchoutputtypes.contributiontojournal.conferencearticle???
AN - SCOPUS:0038522648
SN - 0039-6028
VL - 532-535
SP - 456
EP - 460
JO - Surface Science
JF - Surface Science
Y2 - 29 August 2002 through 31 August 2002
ER -