CuBiSe/Y₂O₃nanocompositeswere synthesized using hydrothermal process. The phase formation and crystallite structure were confirmed by XRD. Morphology structure and the elemental composition were revealed through SEM and EDAX.The optical study shows that the CuBiSe/Y₂O₃ nanocompositehas absorptioncoefficient (0.95 – 1.68cm^-1) and theband gap value estimated as 1.72eV.FTIR spectrum reveals all vibrational modes existingin CuBiSe/Y₂O_3. The excitation of electrons for the prepared sample was detected by FL studies. Cyclic Voltammetry graph shows better reduction process and increasing photocurrent. From J-V curve, the open circuit voltage (V_oc=.123V), short circuit current (J_sc=1.6mA),Fill factor (FF=.356) and efficiency as 0.07 %.

Keywords: Copper bismuth selenide,Yttrium Oxide, Solvothermal Method, Nanocomposite, photoelectrochemical cell