Abstract:
Junction field effect transistors (JFETs) and related manufacturing methods are disclosed herein. A disclosed JFET includes a vertical channel region located in a mesa and a first channel control region located on a first side of the mesa. The first channel control region is at least one of a gate region and a first base region. The JEFT also includes a second base region located on a second side of the mesa and extending through the mesa to contact the vertical channel region. The vertical channel can be an implanted vertical channel. The vertical channel can be asymmetrically located in the mesa towards the first side of the mesa.
Abstract:
A three terminal ReRAM device, which combines a Schottky barrier transistor and a Schottky barrier ReRAM into a single device is provided. The device includes a source region (106), a drain region (108), a gate electrode (114), and a ReRAM material (110) between them, all disposed on an insulating layer (104). The ReRAM material can include a metal oxide, such as zinc or hafnium oxide. A Schottky barrier (118) forms naturally between the drain region and the ReRAM material. As voltage is applied to the gate electrode and the source region, the Schottky barrier breaks down, leading to the formation of a filament (122) across the drain region and the ReRAM material. The filament is non-volatile and short-circuits the reverse-biased barrier, keeping the device in a low resistance state. The filament can be removed by reversing the polarity of the voltage such that the device switches back to a high resistance state.
Abstract:
An embodiment of the invention relates to a memory comprising a strained double-heterostructure (110) having an inner semiconductor layer (115) which is sandwiched between two outer semiconductor layers, (120, 125) wherein the lattice constant of the inner semiconductor layer differs from the lattice constants of the outer semiconductor layers, the resulting lattice strain in the double-heterostructure inducing the formation of at least one quantum dot inside the inner semiconductor layer, said at least one quantum dot being capable of storing charge carriers therein, and wherein, due to the lattice strain, the at least one quantum dot has an emission barrier (Eb) of 1,15 eV or higher, and provides an energy state density of at least three energy states per 1000 nm3, all said at least three energy states (186) being located in an energy band (DeltaWb) of 50 meV or less.
Abstract:
Quantum well charge trap transistors are disclosed featuring an ion implanted region (37) below a stack of high- low-high bandgap materials (15, 39, 41) arranged in a sandwich structure. Source (51) and drain (53) electrodes on either side of implanted region (37), as well as a control gate (43) above the stack allow for electrical control. The implanted region, functioning to provide an offset to the threshold for conduction, is less than feature size F using a technique with spacer masks created for implantation, then removed. The quantum well (71, 75, 73) charge trap stack is built in the area where the spacers were removed with a polysilicon gate (43) atop the stack. Edges of the polysilicon gate are used for self-aligned placement of source and drain.
Abstract:
A semiconductor element comprising a substrate (101), a semiconductor multilayer structure where an emitter layer (102) of an n-type III-V compound semiconductor, a base layer (105) and a collector layer (107) are formed in this order on the substrate (101), and a quantum dot barrier layer (103) interposed between the emitter layer (102) and the base layer (105). The quantum dot barrier layer (103) comprises a plurality of quantum dots (103c), and first and second barrier layers (103a, 103d) sandwiching the quantum dots (103c), respectively, from the emitter layer side and the base layer side, wherein each quantum dot (103c) has a protrusion protruding toward the base layer (105) side. The interface (d1) on the base layer (105) side in the second barrier layer (103d) and the interfaces (d2, d3) on the collector layer side and the emitter layer side in the base layer (105) have curved parts (d12, d22, d23) projecting to the collector layer (107) side in conjuction with the protrusions of the quantum dots (103c).
Abstract:
A superlattice cell that includes Group IV elements is repeated multiple times so as to form the superlattice. Each superlattice cell has multiple ordered atomic planes that are parallel to one another. At least two of the atomic planes in the superlattice cell have different chemical compositions. One or more of the atomic planes in the superlattice cell one or more components selected from the group consisting of carbon, tin, and lead. These superlattices make a variety of applications including, but not limited to, transistors, light sensors, and light sources.
Abstract:
Programmable field effect transistors (FETs) are provided using high-k dielectric metal gate Vt shift effect and methods of manufacturing the same. The method of controlling Vt shift in a high-k dielectric metal gate structure includes applying a current to a gate contact of the high-k dielectric metal gate structure to raise a temperature of a metal forming a gate stack. The temperature is raised beyond a Vt shift temperature threshold for providing an on-state.
Abstract:
A nonvolatile memory cell including a storage element in series with a diode steering element. At least one interface of the diode steering element is passivated.