摘要:
A set of three-dimensional structures and devices may be wired together to perform a wide variety of circuit functions such as SRAMs, DRAMs, ROMs and PLAs. Both N-Channel and P-Channel transistors can be made. The P-channel devices are fabricated conventionally in separate N-wells or, alternatively, they are constructed in a like manner to the array N-channel devices. N and P diffused wire can be electrically joined at polysilicon contacts.
摘要:
A set of three-dimensional structures and devices may be wired together to perform a wide variety of circuit functions such as SRAMs, DRAMs, ROMs and PLAs. Both N-Channel and P-Channel transistors can be made. The P-channel devices are fabricated conventionally in separate N-wells or, alteratively, they are constructed in a like manner to the array N-channel devices. N and P diffused wire can be electrically joined at polysilicon contacts.
摘要:
A fabrication method for forming SOI structures where perfect material is grown epitaxially on a substrate and then, through a series of selective etches and oxidations, an insulating layer is formed below the epitaxial silicon. In the method, low temperature epitaxial techniques are employed to grow a layered structure including a first layer p++ silicon on a substrate wafer, a layer of intrinsic silicon is then formed on the first p++ silicon layer, and a second layer of p++ silicon is formed on the intrinsic silicon layer, and a finally a layer of p-silicon is fabricated on top of the second p++ silicon layer. Grooves are formed through the p-layer, the second p++ silicon layer, the intrinsic silicon layer, and stopped in the first p++ silicon layer. An etch is then employed to remove the intrinsic layer long enough for the p++ silicon layer to be totally undercut, leaving an air gap between the two p++ silicon layers. An oxidation step is then performed to form a bottom insulator consisting of the oxidized first p++ silicon layer and on an upper insulator consisting of the oxidized second p++ silicon layer.
摘要:
Three-dimensional semiconductor structures are taught in which various device types are formed from a plurality of planar layers on a substrate. The major process steps include the formation of a plurality of alternating layers of material, including semiconductor and dielectric materials, forming a vertical access hole in the layers, processing the layers selectively to form active or passive semiconductor devices, and filling the access hole with a conductor. The ultimate structure includes a three-dimensional memory array in which entire dynamic memory cells are fabricated in a stacked vertical orientation above support circuitry formed on a planar surface.
摘要:
The subject invention provides a silicon membrane material made from silicon that is epitaxially deposited at low temperatures greater than or equal to 500.degree. C. and doped with controlled amounts of boron and germanium. A silicon membrane structure is provided and made by one or more layers of ultra thin epitaxially deposited silicon layers that are precisely controlled in both thickness and composition. At least one of the layers is doped with boron in a concentration range greater than 2.times.10.sup.20 atoms of boron per cubic centimeter of silicon, or with germanium in a concentration range greater than 5.times.10.sup.20 atoms of germanium per cubic centimeter of silicon, or with a combination of boron and germanium in these concentration ranges. A silicon membrane fabrication process is also provided which requires no additional masking film to protect the membrane surface during KOH etching of the bulk silicon substrate.
摘要:
A magnetic head slider having a protective coating on the rails thereof, the protective coating comprising a thin adhesion layer and a thin layer of amorphous hydrogenated carbon. The protective coating is deposited on the air bearing surface of the slider after the thin film magnetic heads are lapped to a chosen dimension, but before the pattern of rails is produced on the air bearing surface. The protective coating protects the magnetic head during the rail fabrication process and in usage in a magnetic recording system protects the magnetic head from wear and corrosion damage.
摘要:
A method is described for fabricating electroluminescent devices exhibiting visible electroluminescence at room temperature, where the devices include at least one doped layer of amorphous hydrogenated silicon (a-Si:H). The a-Si:H layer is deposited on a substrate by homogeneous chemical vapor deposition (H-CVD) in which the substrate is held at a temperature lower than about 200.degree. C. and the a-Si:H layer is doped in-situ during deposition, the amount of hydrogen incorporated in the deposited layer being 12-50 atomic percent. The bandgap of the a-Si:H layer is between 1.6 and 2.6 eV, and in preferrable embodiments is between 2.0 and 2.6 eV. The conductivity of the a-Si:H layer is chosen in accordance with device requirements, and can be 10.sup.16 -10.sup.19 carriers/cm.sup.2. The bandgap of the a-Si:H layer depends at least in part on the temperature of the substrate on which the layer is deposited, and can be "tuned" by changing the substrate temperature.
摘要:
A homojunction bipolar transistor having a superlattice base region comprising alternate layers of extrinsic and intrinsic layers, with extrinsic layers being of the opposite conductivity of the emitter and collector layers of the transistor. The alternate extrinsic and intrinsic layers have substantially different doping levels providing abrupt transitions in the valence and conduction bands between layers. The abrupt transitions result in the energy band gap in the base region being effectively reduced with respect to the band gap in the emitter region. In one embodiment, the effective narrow band gap base transistor is implemented by converting a portion of the upper layers of the superlattice to a homogeneous region by heavily doping the portion to form the emitter of the transistor.
摘要:
In intermetallic semiconductor crystal growth such as the growth of GaAs and GaAlAs, silicon as a dopant can be introduced more efficiently and evenly when provided as a gaseous hydride based compound involving a molecule where there are joined silicon atoms such as Si.sub.2 H.sub.6 to Si.sub.5 H.sub.12.
摘要翻译:在诸如GaAs和GaAlAs的生长的金属间半导体晶体生长中,作为掺杂剂的硅可以作为包含分子的气态氢化物基化合物而被更有效和均匀地引入,其中存在诸如Si 2 H 6至Si 5 H 12的硅原子的分子。
摘要:
A method and apparatus for depositing single crystal, epitaxial films of silicon on a plurality of substrates in a hot wall, isothermal deposition system is described. The deposition temperatures are less than about 800.degree. C., and the operating pressures during deposition are such that non-equilibrium growth kinetics determine the deposition of the silicon films. An isothermal bath gas of silicon is produced allowing uniform deposition of epitaxial silicon films simultaneously on multiple substrates. This is a flow system in which means are provided for establishing an ultrahigh vacuum in the range of about 10.sup.-9 Torr prior to epitaxial deposition. The epitaxial silicon layers can be doped in-situ to provide very abruptly defined regions of either n- or p-type conductivity.