Author, as appears in the article.: Carvajal, J. J. ; Mena, J. ; Martínez, O. ; Jiménez, J. ; Zubialevich, V. Z. ; Parbrook, P. J. ; Díaz, F.; Aguiló, M.

Department: Química Física i Inorgànica

URV's Author/s: CARVAJAL MARTÍ, JOAN JOSEP; Mena, J. ; Martínez, O. ; Jiménez, J. ; Zubialevich, V. Z. ; Parbrook, P. J. ; DÍAZ GONZÁLEZ, FRANCISCO MANUEL; AGUILÓ DÍAZ, MAGDALENA

Keywords: structural stress porous materials GaN

Abstract: In this paper we study the optical properties of nanoporous gallium nitride (GaN) epitaxial layers grown by chemical vapour deposition on non-porous GaN substrates, using photoluminescence, cathodoluminescence, and resonant Raman scattering, and correlate them with the structural characteristic of these films. We pay special attention to the analysis of the residual strain of the layers and the influence of the porosity in the light extraction. The nanoporous GaN epitaxial layers are under tensile strain, although the strain is progressively reduced as the deposition time and the thickness of the porous layer increases, becoming nearly strain free for a thickness of 1.7 ¿m. The analysis of the experimental data point to the existence of vacancy complexes as the main source of the tensile strain.

Research group: Física i Cristal·lografia de Nanomaterials Física i Cristal.lografia de Materials

Thematic Areas: Chemistry Química Química

licence for use: https://creativecommons.org/licenses/by/3.0/es/

ISSN: 0957-4484

Author identifier: 0000-0002-4389-7298; ; ; ; ; ; 0000-0003-4581-4967; 0000-0001-6130-9579

Record's date: 2018-05-30

Journal volume: 28

Papper version: info:eu-repo/semantics/submittedVersion

Link to the original source: https://iopscience.iop.org/article/10.1088/1361-6528/aa7e9d

Funding program: altres; VA081U16 altres; VA293U13 plan; ENE2014-56069-C4-4-R plan; CICYT MAT2010- 20441-C02 altres; ICREA Academia; 2010ICREA-02 plan; Retos; MAT2016-75716-C2-1-R (AEI/FEDER, UE) plan; Retos; TEC2014-55948-R

Article's DOI: 10.1088/1361-6528/aa7e9d

Entity: Universitat Rovira i Virgili

Journal publication year: 2017

First page: 375701

Publication Type: Article Artículo Article