This work reveals the formation of electrodeposition (ED) of CuInSe2 (CIS) film on flexible substrate. Ternary compounds were co-deposited on Au coated plastic substrate from an aqueous acidic solution containing 1 mM CuCl2, 5 mM InCl3 and 1 mM SeO2 adjusted to pH = 1.65. It was found that the film stoichiometry improves when the growth solution consisted of I M triethanolamine (TEA) and 0.1 M Na-citrate. The optimal ED-CIS film was obtained after annealing at 150degreesC for 1 h in a nitrogen (N-2) atmosphere. Optical absorption study showed that the energy gap of the annealed material is 1.18eV. Good and reliable quality ED-CIS film was grown in this research with the potential use in fabricating flexible solar cells. This was supported by various analytical techniques, including energy dispersive spectroscopy (EDS), X-ray diffraction spectroscopy (XRD), scanning electron microscopy (SEM), ultraviolet/visible spectroscopy, Fourier transform infrared spectrometer (FTIR) and photoelectrochemical (PEC) characterization. (C) 2004 Elsevier B.V. All rights reserved.