We have synthesized dye sensitized Bi2(Te1-xSex)3 and without dye sensitized Bi2(Te1-xSex)3 thin films by APT on both regular and fluorine tin–oxide (FTO) coated glass substrate. These films were characterized by X-ray diffraction (XRD), optical absorption, SEM, EDAX, AFM, XPS and electro chemical photovoltaical (ECPV) techniques. XRD study revealed that the films were nanocrystalline in nature with rhobohedral phase. ECPV of Bi2(Te1-xSex)3 thin films without dye were measured. Further these films were loaded with Ru (II) dye and their ECPV properties were measured. The dye sensitized Bi2(Te1-xSex)3 / Bi2(Te1-xSex)3 without dye act as an working electrode, Platinum coated FTO as a counter electrode and Iodide / triiodide as an electrolyte, with illumination intensity 28m/w/cm2 were used. Our results revels that the performance of ECPV cell recorded for dye sensitized Bi2 (Te1-x Sex)3 thin films was found to be maximum as compared to Bi2(Te1-xSex)3 thin films without dye, due to maximum light absorption by dye sensitized photo electrodes
