Abstract
In this paper, Silicon on Diamond (SOD) substrates were fabricated using the direct bonding process in two different technologies: the BESOI (Bonded and Etched-back SOI) and the Smart-Cut™ process. The polycrystalline diamond (C∗) film deposited by Chemical Vapor Deposition assisted by Microwave Plasma (MPCVD) was planarized by an innovative process which induces a significant decrease of the diamond surface roughness (1.2nm for the 200nm diamond layer). The planarization method as well as the entire SOD substrate process by the BESOI or the Smart-Cut™ technology are described in the paper. Cross sectional high-resolution transmission microscopy reveals the good quality of the future silicon channel on top of the thin diamond layer.
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