Modulating transistor performance
A method of forming an improved field-effect transistor device is provided. The method includes forming a tensile stressor near a first semiconductor fin. The first semiconductor fin is a fin of an n-channel field-effect transistor. The n-channel field-effect transistor is formed on a substrate. The method also includes forming a compressive stressor near a second semiconductor fin. The second semiconductor fin is a fin of a p-channel field effect transistor. The p-channel field-effect transistor is formed on the substrate. The method can also include forming neutral material over the at least one n-channel and p-channel field effect transistor. The method can also include achieving different device performance by configuring a stressor distance to fin and/or by configuring a stressor volume.
1. A method for forming a field-effect transistor device, the method comprising:
forming a tensile stressor near and spaced apart from a first semiconductor fin, wherein the first semiconductor fin is a fin of an n-channel field-effect transistor, the tensile stressor is formed above the n-channel field-effect transistor, the n-channel field-effect transistor is formed on a substrate, and the tensile stressor is provided in separate volumes of space on both sides of the first semiconductor fin in a horizontal direction;
forming a compressive stressor near and spaced apart from a second semiconductor fin, wherein the second semiconductor fin is a fin of a p-channel field-effect transistor, the compressive stressor is formed above the p-channel field-effect transistor, the p-channel field-effect transistor is formed on the substrate, and the compressive stressor is provided in separate volumes of space on both sides of the second semiconductor fin in the horizontal direction; and
configuring a first distance between the tensile stressor and an edge of the first semiconductor fin to be greater than 0 nm and less than 200 nm, wherein, in a cross-sectional view, the first distance is measured in the horizontal direction between the tensile stressor and the edge of the first semiconductor fin, the configured first distance corresponds to an increased amount of effective current for the n-channel field-effect transistor, and the first distance is configured to achieve a desired effective current for the n-channel field-effect transistor.
2. The method of claim 1 , wherein the tensile stressor induces a tensile stress upon the first semiconductor fin, and the compressive stressor induces a compressive stress upon the second semiconductor fin.
3. The method of claim 1 , wherein the tensile stressor comprises at least one of SiO 2 , SiON, and amorphous silicon.
4. The method of claim 1 , wherein the compressive stressor comprises at least one of SiO 2 and SiN.
5. The method of claim 1 , wherein the tensile stressor and the compressive stressor both comprise a neutral stress material.
6. The method of claim 1 further comprising performing at least one annealing upon the tensile and compressive stressor.
7. The method of claim 1 further comprising:
configuring at least one second distance between the compressive stressor and an edge of the second semiconductor fin, wherein a shorter configured second distance corresponds to a smaller magnitude of threshold voltage for the p-channel field-effect transistor, and the at least one second distance is configured to achieve a desired threshold voltage for the p-channel field-effect transistor.
8. The method of claim 1 further comprising:
configuring a first volume occupied by the tensile stressor, wherein a larger configured first volume corresponds to a smaller magnitude of threshold voltage for the n-channel field-effect transistor, and the first volume is configured to achieve a desired threshold voltage for the n-channel field-effect transistor.
9. The method of claim 1 further comprising:
configuring at least one second volume occupied by the compressive stressor, wherein a larger configured second volume corresponds to a smaller magnitude of threshold voltage for the p-channel field-effect transistor, and the at least one second volume is configured to achieve a desired threshold voltage for the p-channel field-effect transistor.
10. A field-effect transistor device comprising:
at least one n-channel field-effect transistor comprising a first semiconductor fin, formed on a substrate;
at least one p-channel field-effect transistor comprising a second semiconductor fin, formed on the substrate;
a tensile stressor formed near and spaced apart from the first semiconductor fin of the at least one n-channel field-effect transistor, wherein the tensile stressor is formed above the at least one n-channel field-effect transistor, and the tensile stressor is provided in separate volumes of space on both sides of the first semiconductor fin in a horizontal direction; and
a compressive stressor formed near and spaced apart from the second semiconductor fin of the at least one p-channel field-effect transistor, wherein the compressive stressor is formed above the at least one p-channel field-effect transistor, the compressive stressor is provided in separate volumes of space on both sides of the second semiconductor fin in the horizontal direction, a first distance greater than 0 nm and less than 200 nm is configured between the tensile stressor and an edge of the first semiconductor fin, wherein, in a cross-sectional view, the first distance is measured in the horizontal direction between the tensile stressor and the edge of the first semiconductor fin, the configured first distance corresponds to an increased amount of effective current for the n-channel field-effect transistor, and the first distance is configured to achieve a desired effective current for the n-channel field-effect transistor.
11. The apparatus of claim 10 , wherein the tensile stressor induces a tensile stress upon the first semiconductor fin, and the compressive stressor induces a compressive stress upon the second semiconductor fin.
12. The apparatus of claim 10 , wherein the tensile stressor comprises at least one of SiO 2 , SiON, and amorphous silicon.
13. The apparatus of claim 10 , wherein the compressive stressor comprises at least one of SiO 2 and SiN.
14. The apparatus of claim 10 , wherein the tensile stressor and the compressive stressor both comprise a neutral stress material.
15. The apparatus of claim 10 , wherein at least one annealing has been performed.
16. The apparatus of claim 10 , wherein at least one second distance is configured between the compressive stressor and an edge of the second semiconductor fin, a shorter configured second distance corresponds to a smaller threshold voltage for the p-channel field-effect transistor, and the at least one second distance is configured to achieve a desired threshold voltage for the p-channel field-effect transistor.
17. The apparatus of claim 10 , wherein a first volume occupied by the tensile stressor is configured to achieve a desired threshold voltage for the n-channel field-effect transistor, and a larger configured first volume corresponds to a smaller magnitude of threshold voltage for the n-channel field-effect transistor.
18. The apparatus of claim 10 , wherein at least one second volume occupied by the compressive stressor is configured to achieve a desired threshold voltage for the p-channel field-effect transistor, and a larger configured second volume corresponds to a smaller magnitude of threshold voltage for the p-channel field-effect transistor.