Synthesis of CuInS₂ by Sulfide Ion‐Exchange of CuIn(OH)₅ Precursors

Abstract

CuInS 2 semiconductor was synthesized from CuIn(OH) 5 precursors via facile anion exchange in aqueous Na 2 S solution at room temperature. CuIn(OH) 5 was prepared from copper and indium salts and NaOH by co-precipitation in aqueous solution as a polycrystalline. The sulfide exchange reaction did not alter the copper to indium ratio. The reaction resulted in stoichiometric amounts of sulfur in the CuInS 2 sample at room temperature. Fourier transform infrared spectra and ion chromatography were used to analyze the impurities, including chloride and nitrate in the prepared samples. CuInS 2 showed a chalcopyrite crystal structure after annealing at 500 C under 4% hydrogen-mixed argon atmosphere. The bandgap of the CuInS 2 thin film device was estimated to be 1.46 eV.

Core‐Shell Structured Cobalt Sulfide/Cobalt Aluminum Hydroxide Nanosheet Arrays for Pseudocapacitor Application

“…Hence, nanosheet arrays grown along the direction perpendicular to the substrate are an ideal starting material. Usually, high‐temperature phase transformation is used to convert the nanostructure with a given composition into another form such as a metal hydroxide phase to a metal chalcogenide phase …”