| Summary: | 碩士 === 國防大學理工學院 === 材料科學與工程碩士班 === 103 === In this study, we successfully prepared a homogeneous single-phase CuIn0.7Ga0.3Se2 compound powder using high-energy ball milling method. The phase evolution from initial elemental powders to intermediate metastable phases to the final CuIn0.7Ga0.3Se2 compound at various milling stages (5 to 50 min) was thoroughly investigated. The obtained powders at various stages were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and electron probe micro-analysis (EPMA) to evaluate the crystal structure, morphology, and composition of the metastable phases. The intermediate metastable phases including InSe, In2Se3, Ga2Se3, GaSe, CuSe, Cu7Se4, Cu3Se2, and CuInSe2 were formed after 5 min milling. After milling for 50 min, a single phase of quaternary CuIn0.7Ga0.3Se2 compound formed. The average grain size of the milled powder was about 9.3 nm. The results of EPMA also confirmed that a homogeneous CuIn0.7Ga0.3Se2 alloy was formed. Moreover, the CuIn0.7Ga0.3Se2 compound powders were formed an alloy bulk by hot pressing process, the change of structure and characters of CuIn0.7Ga0.3Se2 compound are also studied during hot pressing process. The best argument for pressure 200 MPa and temperature 400℃ relative density of 90 %.
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