Crystal Growth of CuGaS2 from Te, Te-Cu and Te-Cu-S Solutions

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Abstract
The solution growth of CuGaS2 single crystals using Te, Te-Cu and Te-Cu-S solutions has been studied. Crystallization from Te solution results in only small dark polycrystals. Large single crystals of CuGaS2 are obtained when a prescribed amount of excess Cu is added to Te solution (Te-Cu solution). Furthermore, by adding both excess Cu and excess S to Te solution (Te-Cu-S solution) large single crystals of CuGa2. with good crystallinity are obtained. The crystal structure and lattice constants of the grown crystals are measured by RHEED and X-ray diffraction methods. Applying Vegard's law to the lattice constants, we estimate the concentration of Te incorporated in the crystals and find it to be extremely small. The crystallinity of the grown crystals is examined by photoluminescence.

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