The polycrystalline CdS of large scale were grown by chemical pyrolysis deposition for Cu2S/CdS heterojunction solar cells. For high quality CdS polycrystalline thin films, the chemical solution was deposited on indium tin oxide(ITO) glasses at the temperature of 500℃ for 15 second and annealed at 350℃ for 20 minute or 500℃ for 30 second. To fabricate high efficiency solar cells, optical and electrical properties, morphology by SEM and x-ray diffraction on polycrystalline CdS thin films were investigated. From the I-V characteristics of Cu2S/CdS heterojunction, the open circuit voltage, Voc was 0.7 V and the short circuit current, Isc was 4.2 mA. We found that the fill factor(FF) was 0.5 and the efficiency was 2.5%.

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