27-12-2012 дата публикации
Номер: US20120329259A1
A method for fabricating a metal-oxide-semiconductor field-effect transistor includes the following steps. Firstly, a substrate is provided. A gate structure, a first spacer, a second spacer and a source/drain structure are formed over the substrate. The second spacer includes an inner layer and an outer layer. Then, a thinning process is performed to reduce the thickness of the second spacer, thereby retaining the inner layer of the second spacer. After a stress film is formed on the inner layer of the second spacer and the source/drain structure, an annealing process is performed. Afterwards, the stress film is removed. 1. A method for fabricating a metal-oxide-semiconductor field-effect transistor , the method comprising steps of:providing a substrate, wherein a gate structure, a first spacer, a second spacer and a source/drain structure are formed over the substrate, and the second spacer comprises an inner layer and an outer layer;thinning the second spacer, thereby retaining the inner layer of the pacer;forming a stress film on the inner layer of the second spacer and the source/drain structure, and then performing an annealing process; andremoving the stress film.2. The method according to claim 1 , wherein the substrate is a silicon substrate claim 1 , and the gate structure comprises a gate dielectric layer claim 1 , a barrier metal layer claim 1 , a polysilicon dummy gate and a hard mask layer claim 1 , wherein the first spacer is a silicon nitride layer or a multi-layered structure including a silicon dioxide layer and a silicon nitride layer claim 1 , the inner layer of the second spacer is made of silicon dioxide claim 1 , and the outer layer of the second spacer is made of silicon nitride.3. The method according to claim 2 , wherein the gate dielectric layer comprises an interlayer and a high-K dielectric layer claim 2 , and the hard mask layer comprises a silicon nitride layer and a silicon dioxide layer claim 2 , wherein the high-K dielectric layer ...
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