Surface reconstruction of InAs (001) depending on the pressure and temperature examined by density functional thermodynamics

Title
Surface reconstruction of InAs (001) depending on the pressure and temperature examined by density functional thermodynamics
Authors
최정혜박재홍여인원한규승황철성
Keywords
Surface reconstruction; InAs (001); density functional thermodynamics
Issue Date
2017-09
Publisher
Scientific Reports
Citation
VOL 7, 10691
Abstract
A detailed understanding of the atomic configuration of the compound semiconductor surface, especially after reconstruction, is very important for the device fabrication and performance. While there have been numerous experimental studies using the scanning probe techniques, further theoretical studies on surface reconstruction are necessary to promote the clear understanding of the origins and development of such subtle surface structures. In this work, therefore, a pressure-temperature surface reconstruction diagram was constructed for the model case of the InAs (001) surface considering both the vibrational entropy and configurational entropy based on the density functional theory. Notably, the equilibrium fraction of various reconstructions was determined as a function of the pressure and temperature, not as a function of the chemical potential, which largely facilitated the direct comparison with the experiments. By taking into account the entropy effects, the coexistence of the multiple reconstructions and the fractional change of each reconstruction by the thermodynamic condition were predicted and were in agreement with the previous experimental observations. This work provides the community with a useful framework for such type of theoretical studies.
URI
http://pubs.kist.re.kr/handle/201004/66581
ISSN
2045-2322
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KIST Publication > Article
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