GaN-on-diamond technology platform : bonding-free membrane manufacturing process

Smith, Matthew D. and Cuenca, Jerome A. and Field, Daniel E. and Fu, Yen-chun and Yuan, Chao and Massabuau, Fabien and Mandal, Soumen and Pomeroy, James W. and Oliver, Rachel A. and Uren, Michael J. and Elgaid, Khaled and Williams, Oliver A. and Thayne, Iain and Kuball, Martin (2020) GaN-on-diamond technology platform : bonding-free membrane manufacturing process. AIP Advances, 10 (3). 035306. ISSN 2158-3226

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    Abstract

    GaN-on-diamond samples were demonstrated using a membrane-based technology. This was achieved by selective area Si substrate removal of areas of up to 1 cm × 1 cm from a GaN-on-Si wafer, followed by direct growth of a polycrystalline diamond using microwave plasma chemical vapor deposition on etch exposed N-polar AlN epitaxial nucleation layers. Atomic force microscopy and transmission electron microscopy were used to confirm the formation of high quality, void-free AlN/diamond interfaces. The bond between the III-nitride layers and the diamond was validated by strain measurements of the GaN buffer layer. Demonstration of this technology platform is an important step forward for the creation of next generation high power electronic devices.