摘要:
A method for forming and the structure of a strained vertical channel of a field effect transistor, a field effect transistor and CMOS circuitry is described incorporating a drain, body and source region on a sidewall of a vertical single crystal semiconductor structure wherein a hetero-junction is formed between the source and body of the transistor, wherein the source region and channel are independently lattice strained with respect to the body region and wherein the drain region contains a carbon doped region to prevent the diffusion of dopants (boron) into the body. The invention reduces the problem of leakage current from the source region via the hetero-junction and lattice strain while independently permitting lattice strain in the channel region for increased mobility via choice of the semiconductor materials.
摘要:
Structure and methods of fabrication are disclosed for an enhanced FET devices in which dopant impurities are prevented from diffusing through the gate insulator. The structure comprises a Si:C, or SiGe:C, layer which is sandwiched between the gate insulator and a layer which is doped with impurities in order to provide a preselected workfunction. It is further disclosed how this, and further improvements for FET devices, such as raised source/drain and multifaceted gate on insulator, MODFET on insulator are integrated with strained Si based layer on insulator technology.
摘要:
A method for forming and the structure of a strained vertical channel of a field effect transistor, a field effect transistor and CMOS circuitry is described incorporating a drain, body and source region on a sidewall of a vertical single crystal semiconductor structure wherein a heterojunction is formed between the source and body of the transistor, wherein the source region and channel are independently lattice strained with respect to the body region and wherein the drain region contains a carbon doped region to prevent the diffusion of dopants (boron) into the body. The invention reduces the problem of leakage current from the source region via the heterojunction and lattice strain while independently permitting lattice strain in the channel region for increased mobility via choice of the semiconductor materials.
摘要:
A method for forming an integrated circuit on an insulating substrate is described comprising the steps of forming a semiconductor layer on a seed wafer substrate containing an at least partially crystalline porous release layer, processing the semiconductor layer to form a “transferable” device layer containing at least one semiconductor device, and bonding said transferable device layer to a final, insulating substrate before or after separating said device layer from the seed wafer substrate. A second method, for separating a semiconductor layer from a seed wafer substrate, is described wherein an at least partially crystalline porous layer initially connecting the semiconductor layer and seed wafer substrate is split or broken apart by the steps of (i) introducing a fluid including water into the pores of said porous layer, and (ii) expanding said fluid by solidifying or freezing to break apart the porous layer. The at least partially crystalline porous layer may incorporate at least one porous silicon germanium alloy layer alone or in combination with at least one porous Si layer. Also described is an integrated circuit comprising the transfered device layer described above.
摘要:
Structure and methods of fabrication are disclosed for an enhanced FET devices in which dopant impurities are prevented from diffusing through the gate insulator. The structure comprises a Si:C, or SiGe:C, layer which is sandwiched between the gate insulator and a layer which is doped with impurities in order to provide a preselected workfunction. It is further disclosed how this, and further improvements for FET devices, such as raised source/drain and multifaceted gate on insulator, MODFET on insulator are integrated with strained Si based layer on insulator technology.
摘要:
Analysis of residual gases from a process for depositing a film containing silicon on a crystalline silicon surface to determine partial pressure of hydrogen evolved during deposition develops a signature which indicates temperature and/or concentration of germanium at the deposition surface. Calibration and collection of hydrogen partial pressure data at a rate which is high relative to film deposition rate allows real-time, in-situ, non-destructive determination of material concentration profile over the thickness of the film and/or monitoring the temperature of a silicon film deposition process with increased accuracy and resolution to provide films of a desired thickness with high accuracy.
摘要:
A method and a layered heterostructure for forming p-channel field effect transistors is described incorporating a plurality of semiconductor layers on a semiconductor substrate, a composite channel structure of a first epitaxial Ge layer and a second compressively strained SiGe layer having a higher barrier or a deeper confining quantum well and having extremely high hole mobility. The invention overcomes the problem of a limited hole mobility for a p-channel device with only a single compressively strained SiGe channel layer.
摘要:
A SiGe bipolar transistor containing substantially no dislocation defects present between the emitter and collector region and a method of forming the same are provided. The SiGe bipolar transistor includes a collector region of a first conductivity type; a SiGe base region formed on a portion of said collector region; and an emitter region of said first conductivity type formed over a portion of said base region, wherein said collector region and said base region include carbon continuously therein. The SiGe base region is further doped with boron.
摘要:
An SOI substrate and method for forming is described incorporating the steps of forming strained layers of Si and/or SiGe on a first substrate, forming a layer of Si and/or S.sub.i O.sub.2 over the strained layers, bonding a second substrate having an insulating layer on its upper surface to the top surface above the strained layers, and removing the first substrate. The invention overcomes the problem of forming strained Si and SiGe layers on insulating substrates.
摘要:
A method is disclosed for preparing a surface of a Group III-Group V compound semiconductor for epitaxial deposition. The III-V semiconductor surface is treated with boron (B) at a temperature of between about 250° C. and about 350° C. A suitable form for supplying B for the surface treatment is diborane. The B treatment can be followed by epitaxial growth, for instance by a Group IV semiconductor, at temperatures similar to those of the B treatment. The method yields high quality heterojunction, suitable for fabricating a large variety of device structures.