Microstructural dependency of optical properties of m-plane InGaN multiple quantum wells grown on 2º misoriented bulk GaN substratesReportar como inadecuado


Microstructural dependency of optical properties of m-plane InGaN multiple quantum wells grown on 2º misoriented bulk GaN substrates


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Publication Date: 2015-08-28

Journal Title: Applied Physics Letters

Publisher: AIP

Volume: 107

Issue: 8

Number: 082104

Language: English

Type: Article

Metadata: Show full item record

Citation: Tang, F., Barnard, J. S., Zhu, T., Oehler, F., Kappers, M. J., & Oliver, R. A. (2015). Microstructural dependency of optical properties of m-plane InGaN multiple quantum wells grown on 2º misoriented bulk GaN substrates. Applied Physics Letters, 107 (8. 082104)

Description: This is the author accepted manuscript. The final version is available from AIP via http://dx.doi.org/10.1063/1.4928723

Abstract: A non-polar m-plane structure consisting of five InGaN/GaN quantum wells (QWs) was grown on ammonothermal bulk GaN by metal-organic vapor phase epitaxy. Surface step bunches propagating through the QW stack were found to accommodate the 2° substrate miscut towards the -c direction. Both large steps with heights of a few tens of nanometres and small steps between one and a few atomic layers in height are observed, the former of which exhibit cathodoluminescence at longer wavelengths than the adjacent m-plane terraces. This is attributed to the formation of semi-polar facets at the steps on which the QWs are shown to be thicker and have higher Indium contents than those in the adjacent m-plane regions. Discrete basal-plane stacking faults (BSFs) were occasionally initiated from the QWs on the main m-plane terraces, but groups of BSFs was frequently observed to initiate from those on the large steps, probably related to the increased strain associated with the locally higher indium content and thickness.

Keywords: InGaN quantum wells, non-polar m-plane, basal-plane stacking faults, Transmission electron microcopy

Sponsorship: This project is funded by the European Research Council under the European Community's Seventh Framework Programme (FP7/2007-2013)/ERC grant agreement no 279361 (MACONS) and in part by the EPSRC (Grant Nos. EP/H047816/1 and EP/J001627/1).

Identifiers:

This record's URL: https://www.repository.cam.ac.uk/handle/1810/250384http://dx.doi.org/10.1063/1.4928723





Autor: Tang, FengzaiBarnard, Jonathan S.Zhu, TongtongOehler, FabriceKappers, Menno J.Oliver, Rachel A.

Fuente: https://www.repository.cam.ac.uk/handle/1810/250384



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