Co-electrodeposition and Characterization of Cu (In, Ga)Se₂ thin films

Abstract

Cu (In, Ga)Se₂(CIGS) thin films were electrodeposited on Mo-coated soda lime glass substrate by the electrodeposition technique. The chemical bath for co-electrodeposition was prepared from copper chloride, indium chloride, gallium chloride and selenous acid. The effect of different chemical bath concentration of the CIGS films on the microstructure and electric properties has been investigated. The microstructure and morphology of the selenized CIGS thin films were investigated by X-ray diffraction and scanning electron microscopy. The composition of the selenized CIGS thin films were characterized by energy dispersive spectroscopy. Hall coefficient, Conductivity and Mobility of the selenized CIGS thin films were measured by ACCENT HL5500 Hall System. The results indicate CIGS thin films deviate little from the ideal stoichiometric one and single chalcopyrite structure. At room temperature, electrical conductivity, Hall mobility and charge-carrier concentration of the films vary from 49.63 to 64.56 ($\Omega \cdot$cm)^‒1,271 to 386 cm²V^‒1$\cdot$s^‒1, 8.026 × 10¹⁷ to 1.4 87×10¹⁸ cm^‒3, respectively, and are dependent on the composition of the films.