Influence of Water Vapors and Hydrogen on the Energy Band Bending in the SnO2 Microcrystals of Polycrystalline Tin Dioxide Films

The results of studying the dependence of the energy band bending at the interface of contacting SnO 2 microcrystals in the polycrystalline tin dioxide film on the humidity level of clean air and hydrogen concentration in the gas mixture of clean air + H 2 are presented. The experimental results sho...

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Bibliographic Details
Published in:Russian physics journal 2015-06, Vol.58 (2), p.179-187
Main Authors: Gaman, V. I., Аlmaev, А. V., Sevast’yanov, Е. Yu, Maksimova, N. K.
Format: Article
Language:English
Subjects:
Condensed Matter Physics
Hadrons
Heavy Ions
Lasers
Mathematical and Computational Physics
Nuclear Physics
Optical Devices
Optics
Photonics
Physics
Physics and Astronomy
Physics of Semiconductors and Dielectrics
Theoretical
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Summary:The results of studying the dependence of the energy band bending at the interface of contacting SnO 2 microcrystals in the polycrystalline tin dioxide film on the humidity level of clean air and hydrogen concentration in the gas mixture of clean air + H 2 are presented. The experimental results showed that the bending of energy bands in SnO 2 is decreased under exposure to the water vapors and molecular hydrogen. The presence of two types of the adsorption centers for water molecules on the surface of SnO 2 is found. It is shown that at the absolute humidity of the gas mixture above 12 g/m 3 , the H 2 O and H 2 molecules are adsorbed on the same centers, whose surface density is of 10 12 сm –2 at a concentration of donor impurity in SnO 2 equal to 1018 сm –3 .
ISSN:1064-8887
1573-9228
DOI:10.1007/s11182-015-0479-8