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Proceedings Paper

Time evolution of piezoelectic field screening in InGaN quantum wells
Author(s): John D. Thomson; Iain H. Brown; Peter M. Smowton; Peter Blood; Weng W. Chow; A. Mark Fox; Santiago M. Olaizola Izquierdo
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Paper Abstract

We have experimentally observed the time evolution of the photoluminescence spectra of InGaN/GaN quantum wells with widths 3 and 4 nm in response to pulsed excitation at room temperature. We find that for both well widths the time evolution of the energy-integrated photoluminescence increases initially then decays and the spectrum displays a blue shift of the peak energy which then reverses. Through an iterative simulation of the carrier density, piezoelectric field and radiative recombination rate we calculate the behavior of these quantum well systems and find good agreement with the experimental data. The internal field present in the InGaN/GaN system is screened as carrier density increases, which combined with band filling and coulomb interactions result in a blue shift as the system is pumped and as recombination of the carriers occur a red shift is simulated. Although screening of the internal fields occurs our calculations show that at laser threshold there is still a large internal field present, 1.0 MVcm-1, which is 75 % of the unscreened value.

Paper Details

Date Published: 28 April 2005
PDF: 8 pages
Proc. SPIE 5722, Physics and Simulation of Optoelectronic Devices XIII, (28 April 2005); doi: 10.1117/12.591898
Show Author Affiliations
John D. Thomson, Cardiff Univ. (United Kingdom)
Iain H. Brown, Cardiff Univ. (United Kingdom)
Peter M. Smowton, Cardiff Univ. (United Kingdom)
Peter Blood, Cardiff Univ. (United Kingdom)
Weng W. Chow, Sandia National Labs. (United States)
A. Mark Fox, Univ. of Sheffield (United Kingdom)
Santiago M. Olaizola Izquierdo, Univ. of Sheffield (United Kingdom)

Published in SPIE Proceedings Vol. 5722:
Physics and Simulation of Optoelectronic Devices XIII
Marek Osinski; Fritz Henneberger; Hiroshi Amano, Editor(s)

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