摘要:
Bipolar transistors and methods for fabricating bipolar transistors are provided. In one embodiment, the method includes the step or process of providing a substrate having therein a semiconductor base region of a first conductivity type and first doping density proximate an upper substrate surface. A multilevel collector structure of a second opposite conductivity type is formed in the base region. The multilevel collector includes a first collector part extending to a collector contact, a second collector part Ohmically coupled to the first collector part underlying the upper substrate surface by a first depth, a third collector part laterally spaced apart from the second collector part and underlying the upper substrate surface by a second depth and having a first vertical thickness, and a fourth collector part Ohmically coupling the second and third collector parts and having a second vertical thickness different than the first vertical thickness.
摘要:
Semiconductor device structures and related fabrication methods are provided. An exemplary semiconductor device structure includes a collector region of semiconductor material having a first conductivity type, a base region of semiconductor material within the collector region, the base region having a second conductivity type opposite the first conductivity type, and a doped region of semiconductor material having the second conductivity type, wherein the doped region is electrically connected to the base region and the collector region resides between the base region and the doped region. In exemplary embodiments, the dopant concentration of the doped region is greater than a dopant concentration of the collector region to deplete the collector region as the electrical potential of the base region exceeds that of the collector region.
摘要:
A device includes a semiconductor substrate, emitter and collector regions disposed in the semiconductor substrate, having a first conductivity type, and laterally spaced from one another, and a composite base region disposed in the semiconductor substrate, having a second conductivity type, and including a base contact region, a buried region through which a buried conduction path between the emitter and collector regions is formed during operation, and a base link region electrically connecting the base contact region and the buried region. The base link region has a dopant concentration level higher than the buried region and is disposed laterally between the emitter and collector regions.
摘要:
A trench-isolated RESURF diode structure (100) is provided which includes a substrate (150) in which is formed anode (130, 132) and cathode (131) contact regions separated from one another by a shallow trench isolation region (114, 115), along with a non-uniform cathode region (104) and peripheral anode regions (106, 107) which define vertical and horizontal p-n junctions under the anode contact regions (130, 132), including a horizontal cathode/anode junction that is shielded by the heavily doped anode contact region (132).
摘要:
Semiconductor device structures and related fabrication methods are provided. An exemplary semiconductor device structure includes a collector region of semiconductor material having a first conductivity type, a base region of semiconductor material within the collector region, the base region having a second conductivity type opposite the first conductivity type, and a doped region of semiconductor material having the second conductivity type, wherein the doped region is electrically connected to the base region and the collector region resides between the base region and the doped region. In exemplary embodiments, the dopant concentration of the doped region is greater than a dopant concentration of the collector region to deplete the collector region as the electrical potential of the base region exceeds that of the collector region.
摘要:
Semiconductor device structures and related fabrication methods are provided. An exemplary semiconductor device structure includes a first vertical drift region of semiconductor material, a second vertical drift region of semiconductor material, and a buried lateral drift region of semiconductor material that abuts the vertical drift regions. In one or more embodiments, the vertical drift regions and buried lateral drift region have the same conductivity type, wherein a body region of the opposite conductivity type overlies the buried lateral drift region between the vertical drift regions.
摘要:
A trench-isolated RESURF diode structure (100) is provided which includes a substrate (150) in which is formed anode (130, 132) and cathode (131) contact regions separated from one another by a shallow trench isolation region (114, 115), along with a buried cathode extension region (104) formed under a RESURF anode extension region (106, 107) such that the cathode extension region (104) extends beyond the cathode contact (131) to be sandwiched between upper and lower regions (103, 106, 107) of opposite conductivity type.
摘要:
A bipolar transistor having an upper surface, comprises a multilevel collector structure formed in a base region of opposite conductivity type and having a first part of a first vertical extent coupled to a collector contact, an adjacent second part having a second vertical extent a third part of a third vertical extent and desirably of a depth different from a depth of the second part, coupled to the second part by a fourth part desirably having a fourth vertical extent less than the third vertical extent. A first base region portion overlies the second part, a second base region portion separates the third part from an overlying base contact region, and other base region portions laterally surround and underlie the multilevel collector structure. An emitter proximate the upper surface is laterally spaced from the multilevel collector structure. This combination provides improved gain, Early Voltage and breakdown voltages.
摘要:
A device includes a semiconductor substrate, source and drain regions in the semiconductor substrate, a channel region in the semiconductor substrate between the source and drain regions through which charge carriers flow during operation from the source region to the drain region, and a drift region in the semiconductor substrate, on which the drain region is disposed, and through which the charge carriers drift under an electric field arising from application of a bias voltage between the source and drain regions. A PN junction along the drift region includes a first section at the drain region and a second section not at the drain region. The drift region has a lateral profile that varies such that the first section of the PN junction is shallower than the second section of the PN junction.
摘要:
Insufficient gain in bipolar transistors (20) is improved by providing an alloyed (e.g., silicided) emitter contact (452) smaller than the overall emitter (42) area. The improved emitter (42) has a first emitter (FE) portion (42-1) of a first dopant concentration CFE, and a second emitter (SE) portion (42-2) of a second dopant concentration CSE. Preferably CSE≧CFE. The SE portion (42-2) desirably comprises multiple sub-regions (45i, 45j, 45k) mixed with multiple sub-regions (47m, 47n, 47p) of the FE portion (42-1). A semiconductor-metal alloy or compound (e.g., a silicide) is desirably used for Ohmic contact (452) to the SE portion (42-2) but substantially not to the FE portion (42-1). Including the FE portion (42-1) electrically coupled to the SE portion (42-2) but not substantially contacting the emitter contact (452) on the SE portion (42-2) provides gain increases of as much as ˜278.