Publication: Hall effect measurements to calculate the conduction control in semiconductor films of SnO2
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1994-04-15
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Abstract
Hall effect measurement is one of the most powerful methods for obtaining information about transport mechanisms in polycrystalline semiconductor compounds that constitute the basis for understanding the sensing function of semiconductor gas sensors. The presence of grain boundaries represents the essential difference between single-crystal and polycrystalline semiconductors. The boundaries are important because they generally contain fairly high densities of interface states which trap free carriers from the bulk of the grains. In this paper the grain size of the semiconductor (calculated by the XRGA technique) and Hall effect measurements are used in order to obtain conduction-band profiles. Depending on the preparation method (reactive sputtering, electron beam, serigraphy), three types of conduction control can be distinguished. Similar results are obtained from analysis of the material microstructure.
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© Elsevier
Proceedings of Eurosensors (8. 1994. Toulouse, Francia)
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1.- M. C. Horrillo, Estudio y realización de sensores para CO basados en la modulación de la conductividad eléctrica del semiconductor SnO2, Imprenta Provincial, Palencia (Spain), 1993.
2.- J. W. Orton, M. J. Powell, The Hall effect in polycrystalline and powdered semiconductors, Rep. Prog. Phys., vol. 43 (1980), p. 1267-1305
3.- J. Gutierrez et al., Hall coeffiicinte measurements for SnO2 doped sensors as a function of temperature and atmosphere, Sensors and Actuators B, vol. 15-16 (1993), p. 98-104