Thin films of amorphous germanium‐tin alloy have been prepared by sputtering germanium and tin targets with argon in a radio‐frequency magnetron sputtering system. X‐ray diffraction reveals that the film for x < 0.38 is amorphous but that crystalline β‐Sn is formed in the amorphous film for x ≧ 0.38. The optical energy gap is expressed by [eV] for x < 0.38. The equation also correlates the pseudo‐optical energy gap for the GeSn‐β‐Sn composite film.
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Maruyama et al. (1998) studied this question.