TITLE

Determination of the piezoelectric field in InGaN quantum wells

AUTHOR(S)
Brown, I. H.; Pope, I. A.; Smowton, P. M.; Blood, P.; Thomson, J. D.; Chow, W. W.; Bour, D. P.; Kneissl, M.
PUB. DATE
March 2005
SOURCE
Applied Physics Letters;3/28/2005, Vol. 86 Issue 13, p131108
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
In many studies, the value of the experimentally determined internal piezoelectric field has been reported to be significantly smaller than theoretical values. We believe this is due to an inappropriate approximation for the electric field within the depletion region, which is used in the analysis of experimental data, and we propose an alternative method. Using this alternative, we have measured the strength of the internal field of InGaN p-i-n structures, using reverse bias photocurrent absorption spectroscopy and by fitting the bias dependent peak energy using microscopic theory based on the screened Hartree-Fock approximation. The results agree with those using material constants interpolated from binary values.
ACCESSION #
16702317

 

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