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Cadmium selenide thin film; trap depth; photocurrent decay.

Effect of illumination on mobility has been studied from the photocurrent decay characteristics of thermally evaporated CdSe thin films deposited on suitably cleaned glass substrate held at elevated substrate temperatures. The study indicates that the mobilities of the carriers of different trap levels are activated due to the energy of incident illumination, which results in the existence of two distinct trap levels. In each trap depth the energy of the trap increases linearly. It infers that there is a linear distribution of traps of different energies below the conduction band.

Kangkan Sarmah¹ Ranjan Sarma¹

1. Department of Physics, Gauhati University, Guwahati 781 014, India

Published

August 2009

Manuscript received

19 May 2008

Manuscript revised

26 April 2009