Synthesis and Characterization of CuInS2 Microsphere under Controlled Reaction Conditions and Its Application in Low-Cost Solar Cell

CuInS2 microsphere was synthesized by Ultrasonic method in propylene glycol, as solvent, and copper oxalate, indium chloride and thioacetamde (TAA) as precursors. Optimum conditions such as reaction time, solvent type, sulfur source, and ultrasonic power were determined. Then thin film of CuInS2 was prepared and its application in solar cells was investigated. To investigate solar cell application of CuInS2 in the present experiment, at first CuInS2 paste was prepared from nanoparticle and then thin film prepared by doctor balding. I –V curves offer key parameters including short-circuit current (ISC) and the open-circuit voltage (VOC). Another important parameter for solar cells is fill factor (FF). A series of analysis including X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence (PL) spectroscopy were performed to characterize the CusInS2 microsphere. The optical band gap of CuInS2 microsphere was estimated to be 2.28 eV.