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Open Access Nano Express

A New Method for Lift-off of III-Nitride Semiconductors for Heterogeneous Integration

KeYan Zang*, DavyWC Cheong*, HongFei Liu, Hong Liu, JingHua Teng and SooJin Chua

Author Affiliations

Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 3 Research Link, Singapore, 117602, Singapore

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Nanoscale Research Letters 2010, 5:1051-1056  doi:10.1007/s11671-010-9601-6

Published: 22 April 2010

Abstract

The release and transfer of GaN epilayers to other substrates is of interest for a variety of applications, including heterogeneous integration of silicon logic devices, III–V power devices and optical devices. We have developed a simple wet chemical etching method to release high-quality epitaxial III-nitride films from their substrates. This method builds on a nanoepitaxial lateral overgrowth (NELO) process that provides III-Nitride films with low dislocation densities. NELO is accomplished using a nanoporous mask layer patterned on GaN substrates. Chemical removal of the SiO2 layer after growth of III-Nitride overlayers causes fracture at the interface between the GaN film and the original GaN substrate, resulting in free-standing GaN films with nanostructured surfaces on one side. These layers can be transferred to other substrates, and the nano-structured surface can be used in photonic devices, or planarized for power devices.

Keywords:
Nanorod; Lift off; III-nitride semiconductor