Peer-Reviewed Journal Details
Mandatory Fields
Green, R. T. and Tan, W. S. and Houston, P. A. and Wang, T. and Parbrook, P. J.;
Journal Of Electronic Materials
Investigations on electrode-less wet etching of GaN using continuous ultraviolet illumination
Optional Fields
Dry etching of GaN-based devices can introduce damage onto exposed layers of the semiconductor. In this paper, electrode-less wet etching of nominally undoped GaN is investigated in terms of light intensity, solution concentration, and mask geometry in order to determine the conditions required to obtain smooth surface morphologies. Using the results, surfaces were etched with a root-mean-squared (RMS) surface roughness of 1.7 nm. Furthermore, the etch selectivity is used to gain access to buried p-type layers allowing n-p diodes to be fabricated. Contact resistances to the exposed p-type layers were found to be superior to those obtained by dry etching.
Grant Details