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Today one of our major challenges to the world scientific community is to find a sustainable supply of electrical energy. CuInSe2 (CIS) nanocrystals were synthesized by arrested precipitation method to get two compounds CIS DPP: Se and CIS TBP: Se to be an absorber layer of solar cells. Among these renewable energies, the direct conversion of sunlight is the most promising especially in Iraq. The photovoltaic source of energy, i.e. solar irradiation, has the advantage of being widely distributed over the world.