Please use this identifier to cite or link to this item:
|Title:||Spatially resolved photoluminescence of laterally overgrown GaN|
|Citation:||Gibart, P., Beaumont, B., Soo-Jin, C. (1999-05). Spatially resolved photoluminescence of laterally overgrown GaN. Journal of Crystal Growth 201 : 365-370. ScholarBank@NUS Repository. https://doi.org/10.1016/S0022-0248(98)01355-4|
|Abstract:||The epitaxial lateral overgrowth (ELOG) of GaN has recently proven to be a suitable technique to significantly reduce the dislocation density in metalorganic vapor phase epitaxy (MOVPE) or hydride vapor phase epitaxy (HVPE) of GaN. We have investigated by spatially resolved photoluminescence on GaN overgrown from hexagonal openings and partially coalesced pyramids obtained by MOVPE. Different positions of the overgrowth were analyzed, i.e., the edge of the coalesced pyramid, the center, the starting pyramids and GaN underneath the dielectric. Whereas the photoluminescence (PL) spectra of starting pyramids and GaN underneath the dielectric behave about the same, a drastic difference between edge and center of coalesced pyramids is observed. Two PL bands are observed at 300 K, the band edge one, at 3.41 eV, and the yellow luminescence (YL) around 2.2 eV. The highest intensity of the 3.41 eV peak comes from the edge of the overgrowth, the lowest from the center. Conversely, the YL intensity is the strongest at the center of the overgrowth, once again by one order of magnitude. In addition, the YL could be resolved into overlapping gaussian lines, each of them corresponding to a given LO phonon replica. The lineshape is analyzed in the frame of configuration coordinate diagram, and the zero phonon line estimated to be at 2.53 eV.|
|Source Title:||Journal of Crystal Growth|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Nov 10, 2018
WEB OF SCIENCETM
checked on Oct 17, 2018
checked on Oct 19, 2018
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.