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Optical properties of nearly stacking-fault-free m-plane GaN homoepitaxial films grown by metal organic vapor phase epitaxy on low defect density freestanding GaN substrates

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Prospective optical properties were demonstrated for nearly stacking fault-free m-plane GaN homoepitaxial films grown by metal organic vapor phase epitaxy on the m-plane freestanding GaN substrates. Values of full width at half maximum of x-ray rocking curves were close to the substrate values being 31 arcsec for the (1010) diffraction with <0001> azimuth and 48 arcsec for the (1012) diffraction. Threading dislocation densities were lower than 5×106 cm-2. The film surfaces exhibited atomically flat morphology with well-aligned monolayer steps. Low-temperature photoluminescence (PL) spectra exhibited polarization-dependent well-resolved bound and free exciton emission lines, and a characteristic π(k⊥c,E||c)-polarized PL line was also observed. Room-temperature effective PL lifetime of the free exciton peak increased with increasing supply ratio of ammonia to trimethylgallium, and a record long value for m-plane GaN (268 ps) was obtained.

Published in:

Applied Physics Letters  (Volume:92 ,  Issue: 9 )

Date of Publication:

Mar 2008

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