SiGe-On-Insulator (SGOI) Technology and MOSFET Fabrication
Author(s)Cheng, Zhiyuan; Fitzgerald, Eugene A.; Antoniadis, Dimitri A.
In this work, we have developed two different fabrication processes for relaxed Si₁₋xGex-on-insulator (SGOI) substrates: (1) SGOI fabrication by etch-back approach, and (2) by "smart-cut" approach utilizing hydrogen implantation. Etch-back approach produces SGOI substrate with less defects in SiGe film, but the SiGe film uniformity is inferior. "Smart-cut" approach has better control on the SiGe film thickness and uniformity, and is applicable to wider Ge content range of the SiGe film. We have also fabricated strained-Si n-MOSFET’s on SGOI substrates, in which epitaxial regrowth was used to produce the surface strained Si layer on relaxed SGOI substrate, followed by large-area n-MOSFET’s fabrication on this structure. The measured electron mobility shows significant enhancement (1.7 times) over both the universal mobility and that of co-processed bulk-Si MOSFET’s. This SGOI process has a low thermal budget and thus is compatible with a wide range of Ge contents in Si₁₋xGex layer.
Advanced Materials for Micro- and Nano-Systems (AMMNS);
strained-Si, SiGe, SiGe-on-Insulator, SGOI, SOI, MOSFET, mobility, bonding, etch-back, etch-stop, smart-cut, hydrogen implantation