Bulg. J. Phys. vol.27 no.S3 (2000), pp. 158-161

Spatial Distribution of Current Densities in an Infrared Image Converter

B.G. Salamov, H. Yucel, K. Çolakoğlu
Physics Department, Faculty of Arts and Sciences, Gazi University, 06500 Ankara, Turkey
Abstract. This work studies the spatial distribution pattern of the current density in an IR image converter with a GaAs photodetector. Transformation of the profile and amplitude of the current density of the filaments in the different regions of the CVC has been studied. This method of quantitative study of the non-uniform light emission distribution can be used only at relatively low current values and only when the Townsend discharge does not have a significant influence on the transport properties of the photodetector. The filamentation (i.e. an inhomogeneous distribution of the current density) was primary due to the formation of a space charge of positive ions in the discharge gap between photodedector and a transparent anode plate that changed the discharge from the Townsend to the glow type.

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