<title>Metal organic vapor phase epitaxy of GaN and lateral overgrowth</title>

Abstract

Nitride semiconductor alloys have merged as the most promising materials for short wave lengths light emitting diodes and laser diodes (LDs). The GaInN multiquantum wells structure was used as the active part of LDs and have presently proven to work at room temperature in cw mode for 10,000 hrs. These achievements would have not been possible without the emergence of new approaches in heteroepitaxy of GaN leading to layers exhibiting lower dislocation densities than those grown using conventional heteroepitaxy. Metal Organic Vapor Phase Epitaxy (MOVPE) has demonstrated its ability to fabricate structures for optoelectronics GaN based devices. Several nitrogen sources have been tested, but, so far NH3 remains the best nitrogen precursor despite the stringent requirement of high V/III ratio in the vapor phase. With the epitaxial lateral overgrowth (ELOG), high quality GaN layers have been obtained. This ELOG technology can be applied either by HVPE or MOVPE, on sapphire or 6H-SiC substrates. The dislocations densities in the overgrowth region are orders of magnitude lower than in the standard heteroepitaxial GaN layers.© (1999) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.