Research Article

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2019, 12(11): 2718–2722

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https://doi.org/10.1007/s12274-019-2504-7

Au-catalysed free-standing wurtzite structured InAs nanosheets grown by molecular beam epitaxy

Qiang Sun1, Han Gao1, Xiaomei Yao1,2,3, Kun Zheng4, Pingping Chen2, Wei Lu2, and Jin Zou1,5 (*)

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1 Materials Engineering, The University of Queensland, St Lucia, QLD 4072, Australia
2 State Key Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 Yutian Road, Shanghai 200083, China
3 University of Chinese Academy of Sciences, No.19A Yuquan Road, Beijing 100049, China
4 Institute of Microstructure and Properties of Advanced Materials, Beijing University of Technology, Beijing 100124, China
5 Centre for Microscopy and Microanalysis, The University of Queensland, St Lucia, QLD 4072, Australia

Keywords: InAs nanosheet, wurtzite structure, catalyst supersaturation, molecular beam epitaxy
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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 {112 _ 0} surfaces, grown along the <11 _ 02 _ > 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 {112 _ 0} 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.
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Au-catalysed free-standing wurtzite structured InAs nanosheets grown by molecular beam epitaxy. Nano Res. 2019, 12(11): 2718–2722 https://doi.org/10.1007/s12274-019-2504-7

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