Abstract:
Bi-stable static random access memory (SRAM) bit cells formed from III- V compounds and configured to achieve higher operating speeds are disclosed. In one aspect, a bi-stable SRAM bit cell includes substrate (202), a first well layer (204) formed over substrate from a III- V compound doped with a first type material, and a second well layer (206) formed over the first well layer (204) from a lll-V compound doped with a second type material. A channel layer (208) is formed over the second well layer (206) from a lll-V compound doped with the first type material. Source and drain regions (210, 214) are formed over the channel layer (208) from a lll-V compound doped with the first type material, and a gate region (224) is formed over the channel layer (208). Bipolar junction transistors (BJTs, 228(1) and 228(2)) are formed such that a data value can be stored in second well layer (206). A collector tap electrode (CL) is configured to provide access to collector of each BJT for reading or writing data.
Abstract:
Insulate Gate Hybrid Mode Transistor (IGHMT) includes a substrate of the first conductivity type having a high doping top layer of the same conductivity type on its first surface; a PN junction formed by a second conductivity type bottom layer provided on the second surface of the substrate; plurality of trenches that penetrate the surface of high doping top layer and extend a pre-determined depth into substrate separated by the mesas having parallel sides. In one side of the mesa the sidewall Schottky junction is formed on the upper portion of the first trench while in the opposite side of the mesa the MOS control electrode is formed in the second trench. The Cathode electrode electrically connect Schottky junction in the first trench and high doping top layer. The Anode electrode electrically connects the surface of the bottom layer.
Abstract:
A method is provided for forming a trench-based semiconductor devices, e.g., trench FETs, having front-side drain contacts. The method may include forming an epitaxy region, forming a poly gate trench in the epitaxy region, forming a drain contact trench through the poly gate trench and extending below the poly gate trench, forming a poly gate in the poly gate trench, forming a front-side drain contact in the drain contact trench, and forming a source region in the epitaxy region adjacent the poly gate. The device may define a drift region from the poly gate/lower source region surface intersection to the front-side drain contact. The drift region may be located within the epitaxy layer, without extending into an underlying substrate or transition layer. The front-side drain contact depth may be selected to influence the device breakdown voltage. The front-side drain contacts may allow flip-chip mounting of the IC structure.
Abstract:
In one aspect, a silicon-controlled rectifier (SCR) includes a Zener diode embedded in the SCR. In another aspect, a laterally diffused metal oxide semiconductor (LDMOS) includes a Zener diode embedded in the LDMOS. In a further aspect, a lateral insulated-gate bipolar transistor (IGBT) includes a Zener diode embedded in the IGBT.
Abstract:
A trench gate semiconductor switching element is provided. The semiconductor substrate of ths element includes a second conductivity type bottom region in contact with the gate insulation layer at a bottom surface of the trench, and a first conductivity type second semiconductor region extending from a position in contact with a lower surface of the body region to a position in contact with a lower surface of the bottom region. The bottom region includes a first bottom region in contact with the gate insulation layer in a first range of the bottom surface positioned at an end in a long direction of the trench and extending from the bottom surface to a first position; and a second bottom region in contact with the gate insulation layer in a second range adjacent to the first range and extending from the bottom surface to a second position lower than the first position.
Abstract:
A quasi-lateral diffusion transistor is formed in a semiconductor-on-insulator (SOI) wafer by forming a gate region, a body region, a drift region, and a source region and bonding a handle wafer to the SOI wafer at a first side (e.g., top side) of the SOI wafer; and removing a semiconductor substrate of the SOI wafer, forming a hole in a buried insulator layer of the SOI wafer, and forming a drain region for the transistor at a second side (e.g., bottom side) of the SOI wafer. The body region and the drift region physically contact the buried insulator layer. The drain region is formed in a bottom portion of the drift region exposed by the hole and is laterally offset from the source region. In operation of the quasi-lateral diffusion transistor, a current flow direction through the semiconductor layer is diagonal between the source region and the drain region.