Dual peaks of optical absorption in MgZnO/AlGaN core-shell nanowires

IF 3 Q2 PHYSICS, CONDENSED MATTER
Y.M. Tang, X.H. Ji, Y. Qu
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引用次数: 0

Abstract

ZnO nanowire is one of the most promising candidates for ultraviolet optoelectric emitters and detectors which can be well prepared on Si substrates. However, the relatively poor p-type doping and high density of surface defects in ZnO nanowires seriously limits its inner quantum efficiency. A p-type wurtzite AlGaN shell of ZnO could be a solution by serving both as the holes provider and a barrier which keeps the surface defects away. In this work, optical absorption in MgZnO nanowires wrapped by a wurtzite AlGaN shell is investigated by Fermi golden rule with consideration of the wurtzite and rocksalt mixed crystal structure in MgZnO. The calculations show that the wurtzite AlN shell could provide a quantum confinement to carriers in MgZnO nanowire with large range of component. Furthermore, it is interesting to find that the mixed crystal phases in MgZnO leads to dual response frequencies of photons. The double optical absorption peaks from the inter band transition of electrons always can be recognized due to their large difference on frequencies. While the dual peaks from inter-subband transitions are tend to exhibit as a broadening especially in the nanowire with a high Mg mole fraction or a large radius. The results give a guidance for the MgZnO/AlGaN core-shell nanowires ultraviolet detectors with multi response frequency.
MgZnO/AlGaN核壳纳米线的光吸收双峰
ZnO纳米线可以在硅衬底上制备,是紫外光发射体和探测器最有前途的候选材料之一。然而,ZnO纳米线中相对较差的p型掺杂和高密度的表面缺陷严重限制了其内部量子效率。ZnO的p型纤锌矿AlGaN壳可以作为空穴提供者和防止表面缺陷的屏障来解决这一问题。考虑到纤锌矿和岩盐混合晶体结构,利用费米黄金法则研究了纤锌矿和岩盐混合晶体结构包裹的MgZnO纳米线的光吸收。计算结果表明,纤锌矿AlN壳层可以对组分范围较大的MgZnO纳米线中的载流子提供量子约束。此外,有趣的是,MgZnO中的混合晶相导致光子的双响应频率。由于电子带间跃迁产生的双光吸收峰在频率上的差异很大,因此它们总是可以被识别出来。而亚带间跃迁的双峰则呈现出展宽的趋势,特别是在高Mg摩尔分数和大半径的纳米线中。研究结果对制备多响应频率的MgZnO/AlGaN核壳纳米线紫外探测器具有一定的指导意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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CiteScore
6.50
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0.00%
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