ELECTRICAL-CONDUCTIVITY, OPTICAL-ABSORPTION AND STRUCTURAL STUDIES INCUINSE2 THIN-FILMS

Electrical, optical and structural properties of CuInSe2 thin films de posited on glass substrates are studied for different substrate temper atures. The substrate temperature is varied in the range 300-773K. Act ivation energy (E(a)) has been calculated for the films using the Arrh enius plot and the band gap (E(g)) has been determined from the optica l transmission spectra. Optical absorption spectra show variation in b and gap varying from 1.03 to 1.15 eV for E(g1) and 1.23 to 1.44 eV for E(g2). Films deposited at higher substrate temperatures are polycryst alline in nature. Mobility values are measured using van der Pauw meth od.