Temperature variation of optical energy gap values of the compound CuGaTe2

Abstract

Measurements of optical absorption in the temperature range 20 to 300K were made on polycrstalline samples of the compound CuGaTe2. These results were used to determine values of the optical energy gap Eg as a function of temperature T. The resulting curves of Eg vs T were fitted to a simplified Manoogian-Leclerc equation and the fitted coefficients used to give values of (dEg/dT)1 and (dEg/dT)2, due to lattice dilation and electron-phonon contributions, respectively. Hence, the deformation potentials of the valence and conduction bands were estimated for the present compound.