Skip to main content
Article
Microscopic distribution of extended defects and blockage of threading dislocations by stacking faults in semipolar (1101)(1101)()(1101)() GaN revealed from spatially resolved luminescence
Applied Physics Letters
  • S. Okur, Virginia Commonwealth University
  • S. Metzner, Institute of Experimental Physics
  • N. Izyumskaya, Virginia Commonwealth University
  • F. Zhang, Virginia Commonwealth University
  • Vitaliy Avrutin, Virginia Commonwealth University
  • C. Karbaum, Institute of Experimental Physics
  • F. Bertram, Institute of Experimental Physics
  • J. Christen, Institute of Experimental Physics
  • Hadis Morkoç, Virginia Commonwealth University
  • Ü. Özgür, Virginia Commonwealth University
Document Type
Article
Original Publication Date
2013
DOI of Original Publication
10.1063/1.4826579
Comments

Originally published at http://dx.doi.org/10.1063/1.4826579

Date of Submission
March 2015
Abstract

Spatial distribution of extended defects in semipolar -oriented GaN layers grown on patterned(001) Si substrates with striped grooves of varying width was investigated by optical means only using near-field scanning optical microscopy (NSOM) and cathodoluminescence (CL). A high density of basal and prismatic stacking faults was observed in the c− wings, and the threadingdislocations in c+ wings, which appear as dark patterns in the NSOM and CL images, were found to bend toward the surface during the initial stages of growth. In the case when growingc+ front of GaN made contact with the SiO2 masking layer during growth, stacking faults were found to form also in the c+ wings. These additional stacking faults effectively blocked propagation of dislocations along the c+ direction, resulting in high quality stripes virtually free of defects. As revealed by optical means only without the need for any structural investigation, such control over the threading dislocation density using select growth geometries is potentially advantageous for improving semipolar GaN.

Rights
Okur, S., Metzner, S., Izyumskaya, N., et al., Microscopic distribution of extended defects and blockage of threading dislocations by stacking faults in semipolar (1101)(1101)()(1101)() GaN revealed from spatially resolved luminescence. Applied Physics Letters, 103, 211908 (2013). Copyright © 2013 AIP Publishing LLC.
Is Part Of
VCU Electrical and Computer Engineering Publications
Citation Information
S. Okur, S. Metzner, N. Izyumskaya, F. Zhang, et al.. "Microscopic distribution of extended defects and blockage of threading dislocations by stacking faults in semipolar (1101)(1101)()(1101)() GaN revealed from spatially resolved luminescence" Applied Physics Letters Vol. 103 Iss. 21 (2013)
Available at: http://works.bepress.com/serdal_okur/2/