Patent ID: 6885084
Filing Date: 2005-04-26
Classification: H01L

Abstract:
1. A semiconductor transistor, comprising: a layer having source and drain recesses formed therein with a channel between the source and drain recesses, and being made of a semiconductor material having a first lattice with a first structure and a first spacing; a source and a drain formed in the source and drain recesses respectively, at least one of the source and the drain being made of a film material which: (a) includes a p-dopant; and (b) is formed epitaxially on the semiconductor material so as to have a second lattice having a second structure which is the same as the first structure, the second lattice having a second spacing which is larger than the first spacing, so that a compressive stress is created between the source and the drain in the channel; a gate dielectric layer on the channel; and a conductive gate electrode on the gate dielectric layer.