Reducing Mg acceptor activation-energy in Al(0.83)Ga(0.17)N disorder alloy substituted by nanoscale (AlN)₅/(GaN)₁ superlattice using Mg(Ga) δ-doping: Mg local-structure effect.
Reducing Mg acceptor activation-energy in Al(0.83)Ga(0.17)N disorder alloy substituted by nanoscale (AlN)₅/(GaN)₁ superlattice using Mg(Ga) δ-doping: Mg local-structure effect.
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利用 Mg(Ga) δ 掺杂降低纳米级 (AlN)₅/(GaN)₁ 超晶格替代的 Al(0.83)Ga(0.17)N 无序合金中 Mg 受体活化能:Mg 局域结构效应。
DOI:
10.1038/srep06710
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发表时间:
2014-10-23
影响因子:
4.6
通讯作者:
Ding YM
中科院分区:
文献类型:
--
作者:
Zhong HX;Shi JJ;Zhang M;Jiang XH;Huang P;Ding YM
Improving p-type doping efficiency in Al-rich AlGaN alloys is a worldwide problem for the realization of AlGaN-based deep ultraviolet optoelectronic devices. In order to solve this problem, we calculate Mg acceptor activation energy and investigate its relationship with Mg local structure in nanoscale (AlN)5/(GaN)1 superlattice (SL), a substitution for Al0.83Ga0.17N disorder alloy, using first-principles calculations. A universal picture to reduce acceptor activation energy in wide-gap semiconductors is given for the first time. By reducing the volume of the acceptor local structure slightly, its activation energy can be decreased remarkably. Our results show that Mg acceptor activation energy can be reduced significantly from 0.44 eV in Al0.83Ga0.17N disorder alloy to 0.26 eV, very close to the Mg acceptor activation energy in GaN, and a high hole concentration in the order of 1019 cm−3 can be obtained in (AlN)5/(GaN)1 SL by MgGa δ-doping owing to GaN-monolayer modulation. We thus open up a new way to reduce Mg acceptor activation energy and increase hole concentration in Al-rich AlGaN.
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影响因子:
3.7
作者:
Kresse, G;Furthmuller, J
通讯作者:
Furthmuller, J
影响因子:
1.9
作者:
Kneissl, M.;Kolbe, T.;Weyers, M.
通讯作者:
Weyers, M.
影响因子:
3.7
作者:
Ferreira, Luiz G.;Marques, Marcelo;Teles, Lara K.
通讯作者:
Teles, Lara K.
影响因子:
3.7
作者:
MONKHORST, HJ;PACK, JD
通讯作者:
PACK, JD
影响因子:
3.7
作者:
de Carvalho, Luiz Claudio;Schleife, Andre;Bechstedt, Friedhelm
通讯作者:
Bechstedt, Friedhelm