Polarization properties of wurtzite III nitride indicate the principle of polarization engineering
Polarization properties of wurtzite III nitride indicate the principle of polarization engineering
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发表时间：
2018-08
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通讯作者：
Kaikai Liu;Xiaohang Li
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作者：
Kaikai Liu;Xiaohang Li
III族氮化物的自发极化和压电极化显著影响各种III族氮化物基器件的操作。我们报告了第三族氮化物二元和三元合金的自发极化（SP）和压电（PZ）常数与六方参考结构的从头算研究。这些计算的偏振特性为氮化物半导体器件的偏振工程提供了一个深刻的原则，基于此，我们提出了几个异质结，在结处具有接近零的偏振效应，可以潜在地提高光学和功率器件的性能。极化掺杂效应进行了研究，以及从AlN的BAlN分级的极化掺杂效应可以加倍。
The spontaneous and piezoelectric polarizations of III-nitrides considerably affect the operation of various III-nitride-based devices. We report an ab initio study of the spontaneous polarization (SP) and piezoelectric (PZ) constants of the III-nitride binary and ternary alloys with the hexagonal reference structure. These calculated polarization properties offer us a profound principle for polarization engineering of nitride semiconductor devices, based on which we propose a few heterojunctions which have nearly-zero polarization effect at the junctions that can potentially enhance optical and power device performances. The polarization doping effect was investigated as well and by BAlN grading from AlN the polarization doping effect can be doubled.