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Volumn 82, Issue 11, 2010, Pages

Self-purification in Si nanocrystals: An energetics study

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EID: 77957719417     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.82.115421     Document Type: Article
Times cited : (19)

References (24)
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    • We also tested the possibility of interstitial P in Si nanocrystals. We compare the formation energies of substitutional and interstitial P using a small Si35 H36 nanocrystal (diameter 13). For substitutional P, the formation energy depends on the Si chemical potential μ (Si ) after the replaced Si atom is extracted from the nanocrystal. Our study shows that μ (Si ) needs to be higher than -7.58Ry in order for the formation of interstitial P to be energetically favorable compared to substitutional P. According to our calculations, the total energy of bulk Si is -7.93Ry/atom, which is 4.77 eV lower than our calculated lower bound. If the extracted Si atom is deposited into a bulklike environment, it is highly unlikely that interstitial P can be formed in the nanoregime even if the P atom is close to the surface. We reach the same conclusion for the comparison between substitutional and interstitial B
    • We also tested the possibility of interstitial P in Si nanocrystals. We compare the formation energies of substitutional and interstitial P using a small Si 35 H 36 nanocrystal (diameter 13). For substitutional P, the formation energy depends on the Si chemical potential μ (Si) after the replaced Si atom is extracted from the nanocrystal. Our study shows that μ (Si) needs to be higher than - 7.58 Ry in order for the formation of interstitial P to be energetically favorable compared to substitutional P. According to our calculations, the total energy of bulk Si is - 7.93 Ry / atom, which is 4.77 eV lower than our calculated lower bound. If the extracted Si atom is deposited into a bulklike environment, it is highly unlikely that interstitial P can be formed in the nanoregime even if the P atom is close to the surface. We reach the same conclusion for the comparison between substitutional and interstitial B.
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    • Chan, T.-L.1    Tiago, M.L.2    Kaxiras, E.3    Chelikowsky, J.R.4


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.