TITLE

Broad-area optical characterization of well-width homogeneity in GaN/Al[sub x]Ga[sub 1-x]N multiple quantum wells grown on sapphire wafers

AUTHOR(S)
Pomarico, A.; Lomascolo, M.; Passaseo, A.; Cingolani, R.; Berti, M.; Napolitani, E.; Natali, M.; Sinha, S. K.; Sinha, S.K.; Drigo, A. V.; Drigo, A.V.
PUB. DATE
December 2000
SOURCE
Applied Physics Letters;12/18/2000, Vol. 77 Issue 25
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We have performed spatially resolved photoluminescence spectroscopy on the entire 2 in. sapphire wafers containing GaN/Al[sub x]Ga[sub 1-x]N multiple quantum wells grown by metalorganic chemical vapor deposition. We have observed an energy shift of about 50 meV in the ground level emission energy between the center and the peripheric regions of the samples. We show that such a variation in the emission energy is due to a well narrowing of about 3 ML from the center to the outer regions of the wafers, which induces a large Stark shift through the built-in field. © 2000 American Institute of Physics.
ACCESSION #
4414238

 

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