{"title":"Dual peaks of optical absorption in MgZnO/AlGaN core-shell nanowires","authors":"Y.M. Tang, X.H. Ji, Y. Qu","doi":"10.1016/j.micrna.2025.208284","DOIUrl":null,"url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":100923,"journal":{"name":"Micro and Nanostructures","volume":"207 ","pages":"Article 208284"},"PeriodicalIF":3.0000,"publicationDate":"2025-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Micro and Nanostructures","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2773012325002134","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"PHYSICS, CONDENSED MATTER","Score":null,"Total":0}
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.