TEMPERATURE-VARIATION OF OPTICAL-ENERGY GAP VALUES OF THE COMPOUND CUGATE2

Measurements of optical absorption in the temperature range 20 to 300K were made on polycrstalline samples of the compound CuGaTe2. These re sults were used to determine values of the optical energy gap E-g as a function of temperature T. The resulting curves of E-g vs T were fitt ed to a simplified Manoogian-Leclerc equation and the fitted coefficie nts used to give values of (dE(g)/dT)(1) and (dE(g)/dT)(2), due to lat tice dilation and electron-phonon contributions, respectively. Hence, the deformation potentials of the valence and conduction bands were es timated for the present compound.