摘要
In this study,we report the growth of free-standing InAs nanosheets using Au catalysts in molecular beam epitaxy.Detailed structural characterizations suggest that wurtzite structured InAs nanosheets,with features of extensive{1120}surfaces,grown along the<1102>direction and adopted{0001}nanosheet/catalyst interfaces,are initiated from wurtzite structured[0001]nanowires as the inclined epitaxial growth due to relatively higher In concentrations in Au catalysts,and grown from these inclined nanostructures through catalyst-induced axial growth and their enhanced lateral growth under the high growth temperature.Based on the facts that the nanosheets contain large low energy{1120}surfaces and{0001}nanosheet/catalyst interfaces,the growth of our nanosheets is a thermodynamically driven process.This study provides new insights into fabricating free-standing Ⅲ-Ⅴ nanosheets for their applications in future nanoscale devices.
基金
the Australian Research Council,the National Key R&D Program of China(No.2016YFB0402401)
the National Natural Science Foundation of China(Nos.11634009 and 11774016)
the Key Programs of Frontier Science of the Chinese Academy of Sciences(No.QYZDJ-SSW-JSC007)
The Australian Microscopy&Microanalysis Research Facility is also gratefully acknowledged for providing microscopy facilities for this study.
