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Title: High field conduction in thin films of Se100-xPbx glassy alloys*
Authors: Sharma, N
Kumar, S
Keywords: Chalcogenide glasses;Amorphous semiconductors;Localized states;High field conduction;Space charge limited conduction
Issue Date: Feb-2013
Publisher: NISCAIR-CSIR, India
Abstract: The dc conductivity of amorphous thin films of Se100-xPbx (x = 0, 2, 4, 6 and 10) glassy alloys in vacuum evaporated and at high electric fields, has been measured. Current-Voltage (I-V) characteristics have been measured at various fixed temperatures. In these samples, at low electric fields, ohmic behaviour is observed. However, at high electric fields (E~104 V/cm), non-ohmic behaviour is observed. An analysis of the experimental data confirms the presence of space charge limited conduction (SCLC) in the glassy materials studied in the present case. From the fitting of the data to the theory of SCLC, the density of defect states (DOS) near Fermi level is calculated. Increase in DOS with increase in Pb concentration has been observed which could be correlated with the electro-negativity difference between the constituent elements used in making the above glassy alloys.
Page(s): 125-130
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.51(02) [February 2013]

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