Interactions between nitrogen, hydrogen, and gallium vacancies inGaAs1−xNxalloys
Interactions between nitrogen, hydrogen, and gallium vacancies inGaAs1−xNxalloys
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GaAs1−xNx 合金中氮、氢和镓空位之间的相互作用
DOI:
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发表时间:
2003
期刊:
影响因子:
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通讯作者:
C. Walle
中科院分区:
文献类型:
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作者:
A. Janotti;S. Wei;Shengbai Zhang;S. Kurtz;C. Walle
The effects of H on the interaction between Ga vacancies ${V}_{mathrm{Ga}}$ and N in ${mathrm{GaAs}}_{1ensuremath{-}x}{mathrm{N}}_{x}$ dilute alloys are studied through first-principles total-energy calculations. We find that N binds to Ga vacancies and that in the presence of H this binding is enhanced. The formation energy of ${V}_{mathrm{Ga}}$ bonded to N and H (resulting in a $mathrm{N}ensuremath{-}mathrm{H}ensuremath{-}{V}_{mathrm{Ga}}$ complex) can be more than 2 eV lower than that of the isolated Ga vacancy ${V}_{mathrm{Ga}}$ in GaAs. Our finding that the concentration of ${V}_{mathrm{Ga}}$ increases with N and even more in the presence of H allows us to interpret several recent experiments.