Original Publication Date
Applied Physics Letters
DOI of Original Publication
Date of Submission
Defects in GaN layers grown by hydride vapor-phase epitaxy have been investigated by photoelectrochemical (PEC)etching, and by wet etching in hot H3PO4acid and molten potassium hydroxide (KOH). Threading vertical wires (i.e., whiskers) and hexagonal-shaped etch pits are formed on the etched sample surfaces by PEC and wet etching, respectively. Using atomic-force microscopy, we find the density of “whisker-like” features to be 2×109 cm−2, the same value found for the etch-pit density on samples etched with both H3PO4 and molten KOH. This value is comparable to the dislocation density obtained in similar samples with tunnelingelectron microscopy, and is also consistent with the results of Youtsey and co-workers [Appl. Phys. Lett. 73, 797 (1998); 74, 3537 (1999)].
Visconti, P., Jones, K.M., Reshchikov. M.A., et al. Dislocation density in GaN determined by photoelectrochemical and hot-wet etching. Applied Physics Letters, 77, 3532 (2000). Copyright © 2000 AIP Publishing LLC.
Is Part Of
VCU Electrical and Computer Engineering Publications