Abstract:
The present invention is generally directed to a semiconductor device formed over a multiple thickness buried oxide layer 20, and various methods of making same. In one illustrative embodiment, the device comprises a bulk substrate 12, a multiple thickness buried oxide layer 20 formed above the bulk substrate 12, and an active layer 21 formed above the multiple thickness buried oxide layer 20, the semiconductor device being formed in the active layer 21 above the multiple thickness buried oxide layer 20. In some embodiments, the multiple thickness buried oxide layer 20 is comprised of a first section 20B positioned between two second sections 20A, the first section 20B having a thickness that is less than the thickness of the second sections 20A. In one illustrative embodiment, the method comprises performing a first oxygen ion implant process 42 on a silicon substrate 40, forming a masking layer 44 above the substrate 40, performing a second oxygen ion implant process 46 on the substrate 40 through the masking layer 44, and performing at least one heating process on the substrate 40 to form a multiple thickness buried oxide layer 20 in the substrate 40. In another illustrative embodiment, the method comprises performing a first oxygen ion implant process 46 on a silicon substrate 40, forming a masking layer 44 above the substrate 40, performing a second oxygen ion implant process 42 on the substrate through the masking layer 44, and performing at least one heating process on the substrate 40 to form a multiple thickness buried oxide layer 20 in the substrate 40. In yet another illustrative embodiment, the method comprises forming a multiple thickness buried oxide layer 20 using a wafer bonding technique.
Abstract:
The method for fabrication of a non-symmetrical IGFET of the present invention includes providing a semiconductor substrate having an insulating film and a gate material. A first portion of the gate material overlying a first region of the semiconductor substrate is removed forming a first sidewall of a gate electrode. A dopant is implanted into the first region after forming the first sidewall. After the first region is implanted, a second portion of the gate material overlying a second region of the semiconductor substrate is then removed forming a second sidewall of the gate electrode. A dopant is implanted into the second region after forming the second sidewall. Spacers are formed adjacent to each of the sidewalls of the gate electrode. Then, a dopant is implanted into portions of the first and second regions of the semiconductor substrate outside the gate electrode and the spacers. In one embodiment of the invention, the first region is a heavily doped source region and the second region is a lightly doped drain region. In another embodiment of the present invention the first region is a lightly doped drain region and the second region is a heavily doped source region. In both embodiments, a part of the lightly doped drain region is retained beneath a spacer.
Abstract:
A semiconductor device is provided with the high-speed capabilities of silicon on insulator (SOI) and strained silicon technologies, without requiring the formation of a silicon germanium layer. A layer of compressive material (22) is formed on a SOI semiconductor substrate (20) to induce strain in the overlying silicon layer (21). The compressive materials include silicon oxynitride, phosphorus, silicon nitride, and boron/phosphorus doped silica glass.
Abstract:
In one illustrative embodiment, the method comprises providing an SOI substrate (30) comprises of an active layer (30C), a buried insulation layer (30B) and a bulk substrate (30A), forming a doped region (34) in the bulk substrate (30A) under the active layer, forming a plurality of transistors (32) above the SOI substrate in an area above the doped region (34) and applying a voltage to the doped region to vary a threshold voltage of at least one of the plurality of transistors. In another illustrative embodiment, the method comprises providing a consumer product comprised of at least one integrated circuit product (64), the integrated circuit product being comprised of a plurality of transistors (32) formed in an active layer (30C) of an SOI substrate (30) above a doped region (34) formed in a bulk substrate (30A) of the SOI substrate, the doped region (34) being formed under the active layer, sensing an activity level of the integrated circuit product (64) and applying a voltage of magnitude and a polarity to the doped region, the magnitude and polarity of the applied voltage being determined based upon the sensed activity level of the integrated circuit product (64).
Abstract:
In one illustrative embodiment, the method comprises forming a gate electrode 34 above an SOI substrate 30 comprised of a bulk substrate, a buried insulation layer 30B and an active layer 30C, the gate electrode 34 having a protective layer 34A formed thereabove, and forming a plurality of dielectric regions 45 in the bulk substrate 30 after the gate electrode 34 is formed, the dielectric regions 45 being self-aligned with respect to the gate electrode 34, the dielectric regions 45 having a dielectric constant that is less than a dielectric constant of the bulk substrate 30A. In further embodiments, the method comprises forming a gate electrode 34 above an SOI substrate 30 comprised of bulk substrate 30A, a buried insulation layer 30B and an active layer 30C, the gate electrode 34 having the protective layer 34A formed thereabove, performing at least one oxygen implant process after the gate electrode 34 and the protective layer 34A are formed to introduce oxygen atoms into the bulk substrate 30A to thereby form a plurality of oxygen-doped regions 52 in the bulk substrate 30A, and performing at least one anneal process to convert the oxygen-doped regions 52 to dielectric regions 45 comprised of silicon dioxide in the bulk substrate 30A. In one illustrative embodiment, the device comprises a gate electrode 34 formed above an SOI structure 30 comprised of a bulk substrate 30A, a buried insulation layer 30B, and an active layer 30C, and a plurality of dielectric regions 45 comprised of silicon dioxide formed in the bulk substrate 30A, the dielectric regions 45 being self-aligned with respect to the gate electrode 34.
Abstract:
In one illustrative embodiment, the method comprises providing an SOI substrate (30) comprised of an active layer (30C), a buried insulation layer (30B) and a bulk substrate (30A), the active layer (30C) being doped with a first type of dopant material, the bulk substrate (30A) having an inner well (52) formed therein adjacent a surface of the bulk substrate (30A) and under the active layer (30C), the inner well (52) being doped with the first type of dopant material, forming a transistor (32) above the SOI substrate in an area above the inner well (52) and applying a voltage to the inner well (52) to vary a threshold voltage of the transistor. In some embodiments, the method further comprises forming an NMOS transistor. In other embodiments, the method further comprises forming a PMOS transistor. In another embodiment the magnitude and polarity of an applied voltage being determined based upon a sensed activity level of an integrated circuit product.
Abstract:
The integrated circuit device disclosed herein comprises an insulating layer (32) comprised of a first insulating material that has an opening (36) formed therein as defined by at least one sidewall (36A), at least one sidewall spacer (40) positioned adjacent the sidewall (36A) of the opening (36), the sidewall spacer (40) being comprised of a second insulating material, and a conductive interconnection (42) formed in the opening (36) in the insulating layer (32). In a further embodiment, the first insulating material has a dielectric constant less than approximately 3, and a density less than approximately 1.2 grams/cc, whereas the second insulating material has a dielectric constant less than approximately 7 and a density less than approximately 3 grams/cc. The method disclosed herein comprises forming an opening (36) in a first layer (32) of a first insulating material, the opening (36) being defined by at least one sidewall (36A), and conformally depositing a second layer (38) comprised of a second insulating material in the opening (36) above the sidewall (36A). The method further comprises performing an anisotropic etching process on the second layer to define a sidewall spacer (40) comprised of the second insulating material positioned adjacent the sidewall (36A) of the opening (36), and forming a conductive interconnection (42) in the opening (36) in the insulating layer (32) between the sidewall spacer (40).
Abstract:
In one illustrative embodiment, the method comprises forming a gate electrode 34 above an SOI substrate 30 comprised of a bulk substrate, a buried insulation layer 30B and an active layer 30C, the gate electrode 34 having a protective layer 34A formed thereabove, and forming a plurality of dielectric regions 45 in the bulk substrate 30 after the gate electrode 34 is formed, the dielectric regions 45 being self-aligned with respect to the gate electrode 34, the dielectric regions 45 having a dielectric constant that is less than a dielectric constant of the bulk substrate 30A. In further embodiments, the method comprises forming a gate electrode 34 above an SOI substrate 30 comprised of bulk substrate 30A, a buried insulation layer 30B and an active layer 30C, the gate electrode 34 having the protective layer 34A formed thereabove, performing at least one oxygen implant process after the gate electrode 34 and the protective layer 34A are formed to introduce oxygen atoms into the bulk substrate 30A to thereby form a plurality of oxygen-doped regions 52 in the bulk substrate 30A, and performing at least one anneal process to convert the oxygen-doped regions 52 to dielectric regions 45 comprised of silicon dioxide in the bulk substrate 30A. In one illustrative embodiment, the device comprises a gate electrode 34 formed above an SOI structure 30 comprised of a bulk substrate 30A, a buried insulation layer 30B, and an active layer 30C, and a plurality of dielectric regions 45 comprised of silicon dioxide formed in the bulk substrate 30A, the dielectric regions 45 being self-aligned with respect to the gate electrode 34.
Abstract:
The present invention is generally directed to doping methods for fully-depleted SOI structures, and a device comprising such resulting doped regions. In one illustrative embodiment, the device comprises a transistor formed above a silicon-on-insulator substrate comprised of a bulk substrate (30A), a buried oxide layer (30B) and an active layer (30C), the transistor being comprised of a gate electrode (36), the bulk substrate (30A) being doped with a dopant material at a first concentration level. The device further comprises a first doped region (42A) formed in the bulk substrate (30A), the first doped region (42A) being doped with a dopant material that is the same type as the bulk substrate dopant material, wherein the concentration level of dopant material in the first doped region (42A) is greater than the first dopant concentration level in the bulk substrate (30A), the first doped region (42A) being substantially aligned with the gate electrode (36).
Abstract:
In one illustrative embodiment, the device comprises a transistor (32) formed above a silicon-on-insulator substrate (30) comprised of a bulk substrate (30A), a buried insulation layer (30B) and an active layer (30C), the bulk substrate (30A) being doped with a first type of dopant material and a first well (50) formed in the bulk substrate (30A), the first well (50) being doped with a second type of dopant material that is of a type opposite the first type of dopant material. The device further comprises a second well (52) formed in the bulk substrate (30A) within the first material, the transistor (32) being formed in the active layer (30C) above the second well (52) an electrical contact (60) for the first well (50) and an electrical contact (62) for said second well (52). In one illustrative embodiment, a method of forming a transistor (32) above a silicon-on-insulator substrate (30) comprisedof a bulk substrate (30A) a buried oxide layer (30B) and an active layer (30C), the bulk substrate (30A) being doped with a first type of dopant material is disclosed. The method comprises performing a first ion implant process using a dopant material that is of a type opposite the first type of dopant material to form a first well region (50) within the bulk substrate (30A), performing a second ion implant process using a dopant material that is the same type as the first type of dopant material to form a second well region (52) in the bulk substrate (30A) within the first well (50), the transistor (32) being formed in the active layer (30C) above the second well (52), forming a conductive contact (60) to the first well (50) and forming a conductive contact to the second well (60). The method further comprises a contact well (58) formed in the bulk substrate (30A) within the first well (50), the contact well (58) being comprised of a dopant material that is of the same type as the second type of dopant material, the contact well (58) within the first well (50) having a dopant concentration that is greater than a dopant concentration of the first well (50).