NOVELTY - Preparation of inorganic thin film solar cell, involves preparing cadmium telluride nanocrystals, preparing cadmium sulfide nanocrystals, preparing zinc oxide nanoparticles, preparing cadmium telluride-cadmium sulfide nanocrystal ink (A) by processing cadmium telluride nanocrystals and cadmium sulfide nanocrystals, preparing zinc oxide nanocrystal ink, spin coating the obtained ink (A) on an indium-tin oxide glass to obtain cadmium telluride-cadmium sulfide thin film, then spin coating the zinc oxide nanocrystal ink to obtain zinc oxide film, and forming aluminum electrode.    USE - Preparation of inorganic thin film solar cell (claimed).    ADVANTAGE - The inorganic thin film solar cell is economically prepared.    DETAILED DESCRIPTION - Preparation of inorganic thin film solar cell, involves preparing cadmium telluride nanocrystals by heating a mixture of cadmium oxide, oleic acid and trioctyl phosphine oxide until the solution is clear to obtain cadmium precursor, mixing tellurium powder and trioctyl phosphine oxide to obtain tellurium precursor, adding tellurium precursor to the cadmium precursor and reacting, preparing cadmium sulfide nanocrystals by mixing sulfur powder and trioctyl phosphine oxide to obtain sulfur precursor, adding sulfur precursor to the cadmium precursor and reacting to obtain CdS nanocrystals, preparing zinc oxide nanoparticles by dripping methanol solution of potassium hydroxide into zinc acetate solution at 60 degrees C, continuously stirring and maintaining at same temperature, washing obtained cadmium telluride nanocrystal and cadmium sulfide nanocrystal, adding a predetermined amount of pyridine, refluxing at 110 degrees C and then washing to obtain cadmium telluride-cadmium sulfide nanocrystal ink, dispersing zinc oxide nanoparticles into n-butanol to obtain zinc oxide nanocrystal ink, spin coating the obtained cadmium telluride-cadmium sulfide nanocrystal ink on an indium-tin oxide glass which is coated with poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate) to obtain cadmium telluride-cadmium sulfide thin film, then spin coating the zinc oxide nanocrystal ink to obtain zinc oxide film, and forming aluminum electrode by thermal evaporation method.