TRANSITION METAL IONS AS STOICHIOMETRY SENSORS OF CuGaS2
نویسندگان
چکیده
— The overall stoichiometry compensation through transition ion valency changes has been studied in CuGaS2. For this purpose, Ni and Fe were used as ionic sensors of the matrix state, as these impurities are already present in the as-grown material. The valency changes could be observed either by electron spin resonance or Mossbauer absorption. With increasing sulphur content, the valency of Fe increases first, followed by that of Ni. Further compensation is achieved by creation of intrinsic hole excess centres, associated with the copper vacancy. The experimental results are discussed within the framework of a simple defect chemistry model of CuGaS2.
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