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For epitaxial growth of Ga-based Ⅲ-Ⅴ semiconductor nanowires(NWs)on Si,Ga droplets could provide a clean and compatible solution contrary to the common Au catalyst.However,Ga droplets seem to only work in a limited growth temperature(Ts)range around 620 oC on Si.1-2 We have investigated low-temperature growth of Ga-catalyzed Ⅲ-Ⅴ NWs on Si(111)substrates by molecular-beam epitaxy.