Structural Properties of Laterally Overgrown GaN

Microphotoluminescence mapping of laterally overgrown GaN layers on patterned Si „111) substrates

Three-dimensional microstructural characterization of GaN nonplanar substrate laterally epitaxially overgrown by metalorganic chemical vapor deposition

Transmission electron microscopy techniques are applied to investigate three-dimensional (3D) microstructures of the GaN nonplanar substrate selectively grown by metalorganic chemical vapor deposition. Two-step lateral epitaxial overgrowth (LEO) has been utilized and optimized to fabricate fully coalesced nonplanar mesa substrate templates with the trapezoidal cross-section. All threading dislo...

ROOM TEMPERATURE LASER ACTION IN LATERALLY OVERGROWN GaN PYRAMIDS ON (111) SILICON

Single and multi-mode room temperature laser action was observed in GaN pyramids under strong optical pumping. The 5and 15-micron-wide hexagonal-based pyramids were laterally overgrown on a patterned GaN/AlN seeding layer grown on a (111) silicon substrate by metal-organic chemical vapor deposition. The pyramids were individually pumped, imaged, and spectrally analyzed through a high magnificat...

Structural and optical properties of epitaxially overgrown third-order gratings for InGaN/GaN-based distributed feedback lasers

Laser-diode heterostructures of InGaAlN containing a third-order diffraction grating for distributed optical feedback have been examined with transmission electron microscopy ~TEM! and scanning electron microscopy ~SEM!. The grating was defined holographically and etched by chemically assisted ion-beam etching into the upper GaN confinement layer of the laser structure. After the etch step, it ...

Structural and Dynamical Properties of Zincblende GaN

The structural and dynamical properties of zincblende b-GaN are calculated within a three-body Tersoff potential coupled with a molecular-dynamics simulation scheme for a temperature ranging from 300 to 900 K. A good agreement between the calculated and experimental values of the lattice constant, the bulk modulus and its derivative, and the cohesion energy are obtained. We have also calculated...