Nanotech 2013 Vol. 1
Nanotech 2013 Vol. 1
Nanotechnology 2013: Advanced Materials, CNTs, Particles, Films and Composites (Volume 1)

Nanoscale Materials Characterization Chapter 1

A Cathodoluminescence Study of InGaN/GaN Multiple Quantum Well and N type GaN Structures

Authors: F. Ramos, D. Byrnes, F. Lu

Affilation: Veeco Process Equipment, Inc, United States

Pages: 143 - 146

Keywords: cathodoluminescence, SEM, InGaN MQW, V-pit

Abstract:
A systematic study of the V-pits in 4 periods of InGaN/GaN multiple quantum well structure (MQW) and defects in n type GaN is investigated by room temperature cathodoluminescence. These MQWs were fabricated on a sapphire substrate by using metal organic chemical vapor deposition. The crystal quality is affected by the lattice mismatch between GaN and the sapphire substrates which results in the generation of a high threading dislocation (TD) density in GaN. Ii is believed that V-defects originate at the InGaN/GaN interface and may cause non-radiative recombination centers thus reducing the quantum efficiency of the structure. The optical emission from these defects is discussed in this paper. The density of V-defects observed in monochromatic CL images is compared to the TD density in n type GaN sample.


ISBN: 978-1-4822-0581-7
Pages: 830
Hardcopy: $209.95