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Title: Photoresponse characteristics of vacuum evaporated ZnTe thin films
Authors: Kalita, Pradip Kumar
Sarma, B K
Das, H L
Issue Date: Dec-1999
Publisher: NISCAIR-CSIR, India
Abstract: Thin films of ZnTe have been deposited within substrate temperatures 303-623 K. Films deposited at high substrate temperatures are found to be photosensitive. The photocurrent versus light intensity characteristics of the films show a sublinear behaviour, which indicates that the photoconductivity processes in these films are defect controlled. Deep levels within 0.63 - 0.74 eV are estimated from the slow photocurrent decay characteristics of the films. The existence of such defect levels are also confirmed by dark activation energies in the extrinsic region of temperature dependence of dc conductivity. The activation energy is found to decrease under external illumination which is explained by grain boundary effect.
Page(s): 885-890
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.37(12) [December 1999]

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