Preferential Growth Mode of Large-Sized Vacancy Clusters in Silicon: A Neural-Network Potential and First-Principles Study
Preferential Growth Mode of Large-Sized Vacancy Clusters in Silicon: A Neural-Network Potential and First-Principles Study
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硅中大型空位团簇的优先生长模式:神经网络势和第一性原理研究
DOI:
10.1021/acs.jpcc.1c07973
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发表时间:
2021
影响因子:
3.7
通讯作者:
K. Matsunaga
中科院分区:
文献类型:
--
作者:
T. Ushiro;T. Yokoi;Y. Noda;E. Kamiyama;M. Ohbitsu;H. Nagakura;K. Sueoka;K. Matsunaga
An artificial-neural-network (ANN) interatomic potential trained with data from density-functional-theory (DFT) calculations is developed to reveal favorable modes of large-sized vacancy clusters in silicon. By varying the number of vacancies (n) up to around 103, formation energies (Ef) and relaxed structures for four typical modes of vacancy clusters are examined: the 4-fold coordinated configuration (FC), hexagonal ring cluster (HRC), spherically shaped cluster (SPC), and (111)-oriented stacking fault (SF). The present ANN potential reasonably predictsEfvalues and relaxed structures obtained from DFT calculations for all modes examined. It also predicts that the order ofEfis HRC < SPC ≤ SF for 6 <n≲ 30, HRC ≈ SPC < SF for 30 ≲n≲ 300, and SPC ≤ HRC < SF for 300 ≲n, with the prediction of reasonable relaxed structures in all the ranges ofn. This indicates that the favorable agglomeration mechanism becomes the SPC mode as vacancy clusters involve large numbers of vacancies. By contrast, commonly used empirical potentials significantly overestimateEffor FC and SPC. This supports much better transferability of the present ANN potential for studies of vacancy clusters in Si.
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DOI:
--
发表时间:
2007
期刊:
影响因子:
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通讯作者:
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影响因子:
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