Vertical Electrical Conductivity of ZnO/GaN Multilayers for Application in Distributed Bragg Reflectors
| Autor: | Olof Bäcke, Ehsan Hashemi, David Adolph, Mats Halvarsson, Åsa Haglund, Tommy Ive, Filip Hjort |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Equivalent series resistance business.industry Bragg's law 02 engineering and technology Orders of magnitude (numbers) 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Distributed Bragg reflector 01 natural sciences Atomic and Molecular Physics and Optics 0104 chemical sciences Vertical-cavity surface-emitting laser Stack (abstract data type) Electrical resistivity and conductivity Optoelectronics Electrical and Electronic Engineering 0210 nano-technology business Molecular beam epitaxy |
| Zdroj: | IEEE Journal of Quantum Electronics. 54:1-6 |
| ISSN: | 1558-1713 0018-9197 |
| Popis: | We have demonstrated an electrically conductive ZnO/GaN multilayer structure using hybrid plasma-assisted molecular beam epitaxy. Electrical I-V characteristics were measured through the top three pairs of a six pair ZnO/GaN sample. The total measured resistance was dominated by lateral and contact resistances, setting an upper limit of similar to 10(-4) Omega.cm(2) for the vertical specific series resistance of the stack. A strong contribution to the low resistance is the cancellation of spontaneous and piezoelectric polarization that occurs in the in- plane strained ZnO/GaN sample, as shown by electrical simulations. In addition, the simulations show that the actual vertical resistance of the sample could in fact be three orders of magnitude lower and that ZnO/GaN structures with thicknesses fulfilling the Bragg condition should have similar resistance. Our results suggest that ZnO/GaN distributed Bragg reflectors (DBRs) are a promising alternative to pure III-nitride DBRs in GaN-based vertical-cavity surface-emitting lasers. |
| Databáze: | OpenAIRE |
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