Browsing by Author "Yifru, Meseret"

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    Experimental Investigation of Electrophysical Properties of Hydrogenated Amorphous Silicon
    (Addis Ababa University, 1991-06) Yifru, Meseret
    The I-V characteristics, the dc conductivity o(T), and the frequency dependent conductance G(w) and capacitance C(w) of hydrogenated amorFhous silicon thin films, prepared by the HOMO CVD method, are reported. A temperature and applied voltage range dependent nonlinear I-V characteristics ~las obtained for films withspdium substrate. The temperature dependent dc conductivity was found to obey the band conduction model for the 296-4l7K temperature range. The frequency dependent conductance G(w) exhibited a nonlinear frequency dependence. G(w) showed a large temperature dependence and its frequency exponent S found to decrease with increasing temperature. The ac results, being analyzed with reference to five models of ac conductivity in amorphous semiconductors, agreed ~lith the correlated barrier hopping model for the lOKHZ-UIHZ frequency range