摘要:
Means and methods are provided for trench TMOS devices (41-10, 11, 12), comprising, providing a first semiconductor (53, 53′) of a first composition having an upper surface (541), with a body portion (54) proximate the upper surface (541), a drift portion (46, 83) spaced apart from the upper surface (541) and a trench (49, 49′) having sidewalls (493) extending from the upper surface (541) into the drift portion (46, 83). A second semiconductor (56) adapted to provide a higher mobility layer is applied on the trench sidewalls (493) where parts (78) of the body portion (54) are exposed. A dielectric (70) covers the higher mobility layer (56) and separates it from a control gate (72) in the trench (49, 49′). Source regions (68) formed in the body portion (54) proximate the upper surface (491) communicate with the higher mobility layer (56). When biased, source-drain current (87, 87′) flows from the source regions (68) through gate induced channels (78) in the higher mobility layer (56) and into the drift portion (46, 83) where it is extracted by a drain (42) or other connection coupled to the drift portion (46, 83).
摘要:
Semiconductor structures and methods are provided for a semiconductor device (54-11, 54-12) employing a superjunction structure (81). The method comprises, forming (52-6) first spaced-apart regions (70-1, 70-2, 70-3, 70-4, etc.) of a first semiconductor material (70) of a first conductivity type, forming (52-9) second spaced-apart regions (74-1, 74-2, 74-3, etc.) of a second semiconductor material (74) of opposite conductivity type interleaved with the first space-apart regions (70-1, 70-2, 70-3, 70-4, etc.) with PN junctions therebetween, thereby forming a superjunction structure, wherein the second regions have higher mobility than the first regions for the same carrier type. Other regions (88) are provided in contact with the superjunction structure (81) to direct control current flow therethrough. In a preferred embodiment, the first material (70) is relaxed SiGe and the second material (74) is strained silicon.
摘要:
A high voltage vertical field effect transistor device (101) is fabricated in a substrate (102, 104) using angled implantations (116, 120) into trench sidewalls formed above recessed gate poly layers (114) to form self-aligned N+ regions (123) adjacent to the trenches and along an upper region of an elevated substrate. With a trench fill insulator layer (124) formed over the recessed gate poly layers (114), self-aligned P+ body contact regions (128) are implanted into the elevated substrate without counter-doping the self-aligned N+ regions (123), and a subsequent recess etch removes the elevated substrate, leaving self-aligned N+ source regions (135-142) and P+ body contact regions (130-134).
摘要:
Semiconductor structures (52-9, 52-11, 52-12) and methods (100-300) are provided for a semiconductor devices employing strained (70) and relaxed (66) semiconductors, The method comprises, forming (106, 208, 308) on a substrate (54, 56, 58) first (66-1) and second (66-2) regions of a first semiconductor material (66) of a first conductivity type and a first lattice constant spaced apart by a gap or trench (69), filling (108, 210, 308) the trench or gap (69) with a second semiconductor material (70) of a second, conductivity type and a second different lattice constant so that the second semiconductor material (70) is strained with respect to the first semiconductor material (66) and forming (110, 212, 312) device regions (80, 88, S, G, D) communicating with the first (66) and second (70) semiconductor materials and adapted to provide device current (87, 87′) through at least part of the strained second semiconductor material (70) in the trench (69). In a preferred embodiment, the relaxed semiconductor material is 80:20 Si:Ge and the strained semiconductor material is substantially Si.
摘要:
Methods and apparatus are provided for TMOS devices, comprising multiple N-type source regions, electrically in parallel, located in multiple P-body regions separated by N-type JFET regions at a first surface. The gate overlies the body channel regions and the JFET region lying between the body regions. The JFET region communicates with an underlying drain region via an N-epi region. Ion implantation and heat treatment are used to tailor the net active doping concentration Nd in the JFET region of length Lacc and net active doping concentration Na in the P-body regions of length Lbody so that a charge balance relationship (Lbody*Na)=k1*(Lacc*Nd) between P-body and JFET regions is satisfied, where k1 is about 0.6≦k1≦1.4. The entire device can be fabricated using planar technology and the charge balanced regions need not extend through the underlying N-epi region to the drain.
摘要翻译:提供了用于TMOS器件的方法和装置,其包括并联的多个N型源极区域,位于在第一表面处由N型JFET区域分离的多个P体区域中。 栅极覆盖身体通道区域和位于身体区域之间的JFET区域。 JFET区域经由N-epi区域与下面的漏极区域连通。 离子注入和热处理用于定制长度为L的JFET区域中的净有源掺杂浓度N sub和净活性掺杂浓度N a, 在长度为L <! - SIPO - >本体的P体区域中,电荷平衡关系(L <! - SIPO - >) 满足P体和JFET区之间的> 1 SUB> *(L SUB> N N D D),其中k 1是约 0.6 <= K 1 <= 1.4。 整个器件可以使用平面技术制造,并且电荷平衡区域不需要延伸通过下面的N-epi区域到漏极。
摘要:
A high voltage vertical field effect transistor device (101) is fabricated in a substrate (102, 104) using angled implantations (116, 120) into trench sidewalls formed above recessed gate poly layers (114) to form self-aligned N+ regions (123) adjacent to the trenches and along an upper region of an elevated substrate. With a trench fill insulator layer (124) formed over the recessed gate poly layers (114), self-aligned P+ body contact regions (128) are implanted into the elevated substrate without counter-doping the self-aligned N+ regions (123), and a subsequent recess etch removes the elevated substrate, leaving self-aligned N+ source regions (135-142) and P+ body contact regions (130-134).
摘要:
A TMOS device (10) is formed using a semiconductor layer (16) of a first type. First and second regions (62,64) of the second type are formed in the semiconductor layer and are spaced apart. A third region (68) is formed in the semiconductor layer by implanting. The third region is between and contacts the first and second doped regions, is of the second conductivity type, and is less heavily doped than the first and second doped regions. A gate stack (67) is formed over a portion of the first doped region, a portion of the second doped region, and the third doped region. By implanting after forming the gate stack, fourth and fifth regions (98,100) of the first type are formed in interior portions of the first and second doped regions, respectively. The third region being of the same conductivity type as the first and second regions reduces Miller capacitance.
摘要:
Embodiments of a method for fabricating a semiconductor device having a reduced gate-drain capacitance are provided. In one embodiment, the method includes the steps of etching a trench in a semiconductor substrate utilizing an etch mask, widening the trench to define overhanging regions of the etch mask extending partially over the trench, and depositing a gate electrode material into the trench and onto the overhanging regions. The gate electrode material merges between the overhanging regions prior to the filling of the trench to create an empty fissure within the trench. A portion of the semiconductor substrate is removed through the empty fissure to form a void cavity proximate the trench.
摘要:
Semiconductor structures and methods are provided for a semiconductor device (40) employing a superjunction structure (41) and overlying trench (91) with embedded control gate (48). The method comprises, forming (52-6, 52-9) interleaved first (70-1, 70-2, 70-3, 70-4, etc.) and second (74-1, 74-2, 74-3, etc.) spaced-apart regions of first (70) and second (74) semiconductor materials of different conductivity type and different mobilities so that, in a first embodiment, the second semiconductor material (74) has a higher mobility for the same carrier type than the first semiconductor material (70), and providing (52-14) an overlying third semiconductor material (82) in which a trench (90, 91) is formed with sidewalls (913) having thereon a fourth semiconductor material (87) that has a higher mobility than the third material (82), adapted to carry current (50) between source regions (86), through the fourth (87) semiconductor material in the trench (91) and the second semiconductor material (74) in the device drift space (42) to the drain (56). In a further embodiment, the first (70) and third (82) semiconductor materials are relaxed materials and the second (74) and fourth (87) semiconductor materials are strained semiconductor materials.
摘要:
Embodiments of a semiconductor device include a semiconductor substrate having a first surface and a second surface opposed to the first surface, a trench formed in the semiconductor substrate and extending from the first surface partially through the semiconductor substrate, a gate electrode material deposited in the trench, and a void cavity in the semiconductor substrate between the gate electrode material and the second surface. A portion of the semiconductor substrate is located between the void cavity and the second surface.