摘要:
A spin transistor employing the ferromagnetic semiconductor/semiconductor heterojunction is disclosed. The ferromagnetic semiconductor layers form heterojunctions directly on the source and drain of a regular field effect transistor. Using room temperature ferromagnetic semiconductor materials such as iron doped titanium oxide, the spin transistor can have improved spin injection efficiency due to the conductance matching of the ferromagnetic semiconductor with the semiconductor source and drain. The spin transistor further comprises writing plates to modify the magnetic polarization of the ferromagnetic layers to provide memory states. The spin transistor can be used as a memory cell in a magnetic random access memory with potentially large memory signal by utilizing the magnetic moment induced resistivity change.
摘要:
A silicon/germanium (SiGe) superlattice thermal sensor is provided with a corresponding fabrication method. The method forms an active CMOS device in a first Si substrate, and a SiGe superlattice structure on a second Si-on-insulator (SOI) substrate. The first substrate is bonded to the second substrate, forming a bonded substrate. An electrical connection is formed between the SiGe superlattice structure and the CMOS device, and a cavity is formed between the SiGe superlattice structure and the bonded substrate.
摘要:
A silicon/germanium (SiGe) superlattice thermal sensor is provided with a corresponding fabrication method. The method forms an active CMOS device in a first Si substrate, and a SiGe superlattice structure on a second Si-on-insulator (SOI) substrate. The first substrate is bonded to the second substrate, forming a bonded substrate. An electrical connection is formed between the SiGe superlattice structure and the CMOS device, and a cavity is formed between the SiGe superlattice structure and the bonded substrate.
摘要:
A silicon/germanium (SiGe) superlattice thermal sensor is provided with a corresponding fabrication method. The method forms an active CMOS device in a first Si substrate, and a SiGe superlattice structure on a second Si-on-insulator (SOI) substrate. The first substrate is bonded to the second substrate, forming a bonded substrate. An electrical connection is formed between the SiGe superlattice structure and the CMOS device, and a cavity is formed between the SiGe superlattice structure and the bonded substrate.
摘要:
A silicon/germanium (SiGe) superlattice thermal sensor is provided with a corresponding fabrication method. The method forms an active CMOS device in a first Si substrate, and a SiGe superlattice structure on a second Si-on-insulator (SOI) substrate. The first substrate is bonded to the second substrate, forming a bonded substrate. An electrical connection is formed between the SiGe superlattice structure and the CMOS device, and a cavity is formed between the SiGe superlattice structure and the bonded substrate.
摘要:
A method is provided for forming silicided source/drain electrodes in active devices in which the electrodes have very thin junction regions. In the process, adjacent active areas are separated by isolation regions, typically by LOCOS isolation, trench isolation or SOI/SIMOX isolation. A contact material, preferably silicide, is deposited over the wafer and the underling structures, including gate and interconnect electrodes. The silicide is then planed away using CMP, or another suitable planing process, to a height approximate the height of the highest structure. The silicide is then electrically isolated from the electrodes, using an etch back process, or other suitable process, to lower the silicide to a height below the height of the gate or interconnect electrode. The wafer is then patterned and etched to remove unwanted silicide. The remaining silicide typically forms silicided source regions and silicided drain regions that extend over a portion of the adjacent isolation regions such that the silicided source/drain regions are larger than the underlying source/drain regions to provide a larger contact area.
摘要:
An iridium oxide (IrOx) nanowire neural sensor array and associated fabrication method are provided. The method provides a substrate with a conductive layer overlying the substrate, and a dielectric layer overlying the conductive layer. The substrate can be a material such as Si, SiO2, quartz, glass, or polyimide, and the conductive layer is a material such as ITO, SnO2, ZnO, TiO2, doped ITO, doped SnO2, doped ZnO, doped TiO2, TiN, TaN, Au, Pt, or Ir. The dielectric layer is selectively wet etched, forming contact holes with sloped walls in the dielectric layer and exposing regions of the conductive layer. IrOx nanowire neural interfaces are grown from the exposed regions of the conductive layer. The IrOx nanowire neural interfaces each have a cross-section in a range of 0.5 to 10 micrometers, and may be shaped as a circle, rectangle, or oval.
摘要:
A method of fabricating a low, dark-current germanium-on-silicon PIN photo detector includes preparing a P-type silicon wafer; implanting the P-type silicon wafer with boron ions; activating the boron ions to form a P+ region on the silicon wafer; forming a boron-doped germanium layer on the P+ silicon surface; depositing an intrinsic germanium layer on the boron-doped germanium layer; cyclic annealing, including a relatively high temperature first anneal step and a relatively low temperature second anneal step; repeating the first and second anneal steps for about twenty cycles, thereby forcing crystal defects to the P+ germanium layer; implanting ions in the surface of germanium layer to form an N+ germanium surface layer and a PIN diode; activating the N+ germanium surface layer by thermal anneal; and completing device according to known techniques to form a low dark-current germanium-on-silicon PIN photodetector.
摘要:
A dual-pixel full color complementary metal oxide semiconductor (CMOS) imager is provided, along with an associated fabrication process. Two stand-alone pixels are used for three-color detection. The first pixel is a single photodiode, and the second pixel has two photodiodes built in a stacked structure. The two photodiode stack includes an n doped substrate, a bottom photodiode, and a top photodiode. The bottom photodiode has a bottom p doped layer overlying the substrate and a bottom n doped layer cathode overlying the bottom p doped layer. The top photodiode has a top p doped layer overlying the bottom n doped layer and a top n doped layer cathode overlying the top p doped layer. The single photodiode includes the n doped substrate, a p doped layer overlying the substrate, and an n doped layer cathode overlying the p doped layer.
摘要:
A compound semiconductor-on-silicon (Si) wafer with a Si nanowire buffer layer is provided, along with a corresponding fabrication method. The method forms a Si substrate. An insulator layer is formed overlying the Si substrate, with Si nanowires having exposed tips. Compound semiconductor is selectively deposited on the Si nanowire tips. A lateral epitaxial overgrowth (LEO) process grows compound semiconductor from the compound semiconductor-coated Si nanowire tips, to form a compound semiconductor layer overlying the insulator. Typically, the insulator layer overlying the Si substrate is a thermally soft insulator (TSI), silicon dioxide, or SiXNY, where x≦3 and Y≦4. The compound semiconductor can be GaN, GaAs, GaAlN, or SiC. In one aspect, the Si nanowire tips are carbonized, and SiC is selectively deposited overlying the carbonized Si nanowire tips, prior to the selective deposition of compound semiconductor on the Si nanowire tips.