TITLE

Microphotoluminescence spectra of hillocks in Al0.11Ga0.89N films

AUTHOR(S)
Ke, W. C.; Ku, C. S.; Huang, H. Y.; Chen, W. C.; Lee, L.; Chen, W. K.; Chou, W. C.; Chen, W. H.; Lee, M. C.; Lin, W. J.; Cheng, Y. C.; Cherng, Y. T.
PUB. DATE
October 2004
SOURCE
Applied Physics Letters;10/11/2004, Vol. 85 Issue 15, p3047
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The spatial variation of the optical properties of hillocks in Al0.11Ga0.89N films has been studied by using microphotoluminescence (μ-PL) microscopy. The μ-PL spectrum revealed a strong emission (IH) at 351 nm from the hillock, besides the near-band-edge emission (Inbe) at 341 nm. Moreover, the IH intensity increases significantly and its full width at half maximum decreases from ∼76 to ∼53 meV by probing across the hillock center. These indicated that the hillock structure is a strong emission center. The temperature-dependent μ-PL measurements showed that the IH also has the S-shape behavior with a transition temperature of ∼120 K which is lower than that of Inbe. The redshift of IH is also smaller than Inbe. Both indicated that the Al composition in hillocks is lower than the surrounding area.
ACCESSION #
14909519

 

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