Formation of arsenic clusters in InAs nanowires with an Al2O3 shell |
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| Authors: | In Kim Suji Choi Ji-Hwan Kwon Sang Jung Ahn Min Sun Yeom Ho Seong Lee Seong-Hoon Yi Young Heon Kim |
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| Affiliation: | Center for Supercomputing Applications, Korea Institute of Science and Technology Information, 245 Daehak-ro, Daejeon 34141 Republic of Korea ; Korea Research Institute of Standards and Science, 267 Gajeong-Ro, Yuseong-Gu, Daejeon 34113 Republic of Korea ; Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu 41566 Republic of Korea ; Graduate School of Analytical Science and Technology (GRAST), Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134 Republic of Korea, |
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| Abstract: | An in-depth understanding of thermal behavior and phase evolution is required to apply heterostructured nanowires (NWs) in real devices. The intermediate status during the vaporization process of InAs NWs in an Al2O3 shell was studied by conducting quenching during in situ heating experiments, using a transmission electron microscope. The formation of As clusters in the amorphous Al2O3 shell was confirmed by analyzing the high-angle annular dark field images and energy-dispersive X-ray spectra. The As clusters existed independently in the shell and were also observed at the end of the InAs pieces obtained after quenching. The formation process of the As clusters was demonstrated from a theoretical perspective. Moreover, an ab initio molecular dynamics simulation (AIMD) was conducted to study the atomic and molecular behaviors.InAs nanowires were broken into pieces after the quenching process; some of the pieces were composed only of As. |
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