Study of Density of Localized States in a-Se_{100 - x}Sb_x Films by Space Charge Limited Conduction Measurements

Authors: V. S. KUSHWAHA, SANTOSH KUMAR, A. KUMAR

Abstract: The present paper reports dc conductivity measurements at high electric fields in vacuum evaporated a-Se_{1 - x}Sb_x (x = 0, 0.02, 0.04, 0.06) thin films. At high fields (~ 10^4 V .cm^{-1}), current can be modelled by the theory of space charge-limited conduction in the case of uniform distribution of localised states in the mobility gap of these materials. The addition of Sb in Se results in an increase in the density of localised states.

Keywords: Chalcogenide glasses, Localised states, Space charge limited conduction, High field conduction.

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