Patent ID: 8357995

Claim:
A semiconductor element, comprising: a semiconductor substrate; at least one shallow junction formed in the substrate, doping atoms being disposed in the shallow junction, wherein the at least one shallow junction is formed within an amorphous region of the semiconductor substrate positioned on top of a crystalline region of the semiconductor substrate; and a plurality of carbide precipitates and micro-cavities disposed in the semiconductor substrate below the at least one shallow junction so as to form at least two bands of a plurality of one of carbide precipitates and micro-cavities below first and second source/drain regions and laterally continuously extending, in different vertical depths and in parallel to each other, so that each of the at least two bands of the plurality of one of carbide precipitates and micro-cavities overlaps with a projection of the at least one shallow junction along a vertical direction, respectively, and a first band of the at least two bands of the plurality of one of micro-cavities and carbide precipitates is located nearer to the shallow junction than a second band of the at least two bands of the plurality of one of micro-cavities and carbide precipitates and the second band of the at least two bands of the plurality of one of micro-cavities and carbide precipitates is located in the crystalline region.