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Effect of different electrolytes on porous GaN using photo-electrochemical etching

Al-Heuseen, K. and Hashim, M. R. and Al Obaidi, Nihad K Ali (2011) Effect of different electrolytes on porous GaN using photo-electrochemical etching. Applied Surface Science, 257 (14). pp. 6197-6201. ISSN 0169-4332

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Official URL: http://dx.doi.org/10.1016/j.apsusc.2011.02.031

Abstract

This article reports the properties and the behavior of GaN during the photoelectrochemical etching process using four different electrolytes. The measurements show that the porosity strongly depends on the electrolyte and highly affects the surface morphology of etched samples, which has been revealed by scanning electron microscopy (SEM) images. Peak intensity of the photoluminescence (PL) spectra of the porous GaN samples was observed to be enhanced and strongly depend on the electrolytes. Among the samples, there is a little difference in the peak position indicating that the change of porosity has little influence on the PL peak shift, while it highly affecting the peak intensity. Raman spectra of porous GaN under four different solution exhibit phonon mode E 2 (high), A 1 (LO), A 1 (TO) and E 2 (low). There was a red shift in E 2 (high) in all samples, indicating a relaxation of stress in the porous GaN surface with respect to the underlying single crystalline epitaxial GaN. Raman and PL intensities were high for samples etched in H 2SO 4:H 2O 2 and KOH followed by the samples etched in HF:HNO 3 and in HF:C 2H 5OH.

Item Type:Article
Uncontrolled Keywords:electrolyte, Gan, photo-electrochemical etching, porosity
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:Electrical Engineering
ID Code:28968
Deposited By: Liza Porijo
Deposited On:06 Dec 2012 08:40
Last Modified:06 Dec 2012 08:40

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