Patent ID: 8951875
Filing Date: 2015-02-10
Classification: H01L

Abstract:
1. A semiconductor structure comprising: a substrate comprising: two halo doped layers of the first dopant type, one halo doped layer of the two halo doped layers being over one doped region of the two doped regions and the other halo doped layer of the two halo doped layers being over a different doped region of the two doped regions; a gate structure over the substrate and between the two recesses; two silicon-containing structures of a second dopant type different from the first dopant type, each of the two silicon-containing structures formed over different ones of the two halo doped layers of the first dopant type and filling a corresponding one of the two recesses, and an upper portion of each of the two silicon-containing structures having a dopant concentration higher than that of a lower portion of each of the two silicon-containing structures; and two lightly-doped drain (LDD) regions of the second dopant type under the gate structure, the two LDD regions extending from a corresponding one of the sidewalls of the two recesses toward each other along an upper surface of the substrate, wherein at least one sidewall of at least one recess of the two recesses is orthogonal to the bottom surface of the at least one recess, and at least one of the two halo doped layers conformally overlies the at least one sidewall orthogonal to the bottom surface and the bottom surface of the at least one recess.