Abstract
Thin polycrystalline CuInSe 2 films were cathodically deposited on titanium and SnO 2 coated glass at potentials ranging from −350 mV to −750 mV vs SCE from aqueous sulphate bath using citric acid as complexing agent. The films were annealed at 425°C in an argon atmosphere and characterised by X-ray diffraction and EPMA. From the XRD analysis the structure of the film was found to be tetragonal. The composition of the as deposited film was found to be 1:1:2 by EPMA. From the optical studies the band gap was found to be 1.02 eV. All the as deposited films were found to be p-type. On post heat treatment at 425°C the films deposited at or above −650 mV changed to n-type whereas below −650 mV p-type films only were obtained.
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