Published online by Cambridge University Press: 31 January 2011
Reduction of structural defects in III-nitride based optical devices is of critical importance for high efficient and high reliable optoelectronic performance. Here, three different types of structural defects such as threading dislocations, Mg-related pyramidal defects and columnar defects, observed in GaN-related epitaxial films are described and their relation to reliability of GaN-based LDs is discussed. Composition fluctuations of GaInN MQWs with different In concentrations by analyzed by a laser assisted 3D atom probe are also described.