Abstract:
A strain inducing semiconductor alloy may be formed on the basis of cavities which may have a non-rectangular shape, which may be maintained even during corresponding high temperature treatments, by providing an appropriate protection layer, such as a silicon dioxide material. Consequently, a lateral offset of the strain inducing semiconductor material may be reduced, while nevertheless providing for a sufficient thickness of corresponding offset spacers during the cavity etch process, thereby preserving gate electrode integrity. For instance, p-channel transistors may have a silicon/germanium alloy with a hexagonal shape thereby significantly enhancing the overall strain transfer efficiency.
Abstract:
By removing a portion of a halo region (206, 306) or by avoiding the formation of the halo region (206, 306) within the extension region (209A), which may be subsequently formed on the basis of a re-grown semiconductor material (218, 318), the threshold roll off behavior may be significantly improved, wherein an enhanced current drive capability may simultaneously be achieved.
Abstract:
A non-conformal metal suicide layer (156) in a transistor (150) of recessed drain and source configuration may provide enhanced efficiency with respect to strain-inducing mechanisms, drain/source resistance and the like. For this purpose, in some cases, an amorphizing implantation process may be performed prior to the silicidation process, while in other cases an anisotropic deposition of the refractory metal (156) may be used.
Abstract:
In the process sequence for replacing conventional gate electrode structures (310) by high-k metal gate structures (310N, 310B, 310P), the number of additional masking steps may be maintained at a low level, for instance by using highly selective etch steps (322, 325, 327, 331), thereby maintaining a high degree of compatibility with conventional CMOS techniques. Furthermore, the techniques disclosed herein enable compatibility to front-end process techniques and back-end process techniques, thereby allowing the integration of well-established strain- inducing mechanisms in the transistor level as well as in the contact level.
Abstract:
By providing a protection layer on a silicon/germanium material of high germanium concentration, a corresponding loss of strained semiconductor material may be significantly reduced or even completely avoided. The protection layer may be formed prior to critical cleaning processes and may be maintained until the formation of metal suicide regions. Hence, high performance gain of P-type transistors may be accomplished without requiring massive overfill during the selective epitaxial growth process.
Abstract:
A method of forming a semiconductor structure comprises providing a semiconductor substrate comprising a first transistor element and a second transistor element. The first transistor element comprises at least one first amorphous region and the second transistor element comprises at least one second amorphous region. A stress-creating layer is formed over the first transistor element. The stress-creating layer does not cover the second transistor element. A first annealing process is performed. The first annealing process is adapted to re-crystallize the first amorphous region and the second amorphous region. After the first annealing process, a second annealing process is performed. The stress-creating layer remains on the semiconductor substrate during the second annealing process.
Abstract:
By removing an outer spacer 109, used for the formation of highly complex lateral dopant profiles, prior to the formation of metal suicide, a high degree of process compatibility with conventional processes is obtained, while at the same time a contact liner layer 115 may be positioned more closely to the channel region, thereby allowing a highly efficient stress transfer mechanism for creating a corresponding strain in the channel region.
Abstract:
Three-dimensional transistor structures such as FinFETS and tri-gate transistors may be formed on the basis of an enhanced masking regime, thereby enabling the formation of drain and source areas (211D, 211S), the fins (210) and isolation structures (208A) in a self- aligned manner within a bulk semiconductor material. After defining the basic fin structures (210), highly efficient manufacturing techniques of planar transistor configurations may be used, thereby even further enhancing overall performance of the three-dimensional transistor configurations.
Abstract:
Scalability of a strain-inducing mechanism on the basis of a stressed dielectric overlayer may be enhanced by forming a single stress-inducing layer (230) in combination with contact trenches, which may shield a significant amount of a non-desired stress component in the complementary transistor (220, 220P), while also providing a strain component in the transistor width direction (220W)when the contact material may be provided with a desired internal stress level.
Abstract:
A substrate diode for an SOI device (200, 300) is formed in accordance with an appropriately designed manufacturing flow, wherein transistor performance enhancing mechanisms may be implemented substantially without affecting the diode characteristics. In one aspect, respective openings (21 IA, 21 IB, 31 IA, 311B) for the substrate diode may be formed after the formation of a corresponding sidewall spacer structure (236, 336) used for defining the drain and source regions (237, 337), thereby obtaining a significant lateral distribution of the dopants in the diode areas, which may therefore provide sufficient process margins during a subsequent silicidation sequence on the basis of a removal of the spacers (236, 336) in the transistor devices (230A, 230B, 330A, 33OB). In a further aspect, in addition to or alternatively, an offset spacer (360S) may be formed substantially without affecting the configuration of respective transistor devices (230A, 230B, 330A, 33OB).