Multicrystalline SiGe (mc-SiGe) with microscopic compositional distribution, which has been proposed as a promising material for solar cell applications, was characterized by microscopic Raman spectroscopy. As expected, a strong spatial variation of Raman spectra was observed. However, the compositional distribution obtained by a separate energy-dispersive X-ray analysis did not fully explain the observed spatial variation of Raman spectra. A plausible explanation of the inconsistency is the existence of buil…
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