An extremely-thin silicon-on-insulator transistor is provided that includes a buried oxide layer above a substrate, a silicon layer above the buried oxide layer, a gate stack on the silicon layer, a nitride liner on the silicon layer and adjacent to the gate stack, an oxide liner on and adjacent to the nitride liner, and raised source/drain regions. The gate stack includes a high-k oxide layer on the silicon layer and a metal gate on the high-k oxide layer. Each of the raised source/drain regions has a first part comprising a portion of the silicon layer, a second part adjacent to parts of the oxide liner and the nitride liner, and a third part above the second part. Also provided is a method for fabricating an extremely-thin silicon-on-insulator transistor.