Abstract:
A MOSFET structure and method of forming is described. The method includes forming a metal-containing layer (56) that is thick enough to fully convert the semiconductor layer (22) to a semiconductor metal alloy in a first MOSFET type region (40) but only thick enough to partially convert the semiconductor layer (20) to a semiconductor metal alloy in a second MOSFET type region (30). In one embodiment, the gate stack in a first MOSFET region (40) is recessed prior to forming the metal-containing layer (56) so that the height of the first MOSFET semiconductor stack is less than the height of the second MOSFET semiconductor stack. In another embodiment, the metal-containing layer (56) is thinned over a first type MOSFET region (40) relative to a second type MOSFET region (30) prior to the conversion process.
Abstract:
PROBLEM TO BE SOLVED: To provide a structure and method for reducing a Miller capacitance in a field-effect transistor. SOLUTION: A method for forming a field-effect transistor device includes a step for forming a gate conductor 316 and a gate dielectric on the active device region of an SOI layer formed through an embedded insulator layer 306 on a bulk substrate 308. Source/drain extensions 302 and 304 are formed in the SOI layer adjacent to both sides of the gate conductor, and source/drain sidewall spacers 324 are formed adjacent to the gate conductor. The remaining portion of the SOI layer adjacent to the sidewall spacer is removed to expose a part of the embedded insulator layer. The exposed portion of the embedded insulator layer is removed to expose a part of the bulk substrate. The semiconductor layer is epitaxially grown on the exposed portions of the bulk substrate and the source/drain extensions. The ion-implanted regions 332 and 334 of the source and the drain are formed in the epitaxially grown layer. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
A MOSFET structure and method of forming is described. The method includes forming a metal-containing layer (56) that is thick enough to fully convert the semiconductor layer (22) to a semiconductor metal alloy in a first MOSFET type region (40) but only thick enough to partially convert the semiconductor layer (20) to a semiconductor metal alloy in a second MOSFET type region (30). In one embodiment, the gate stack in a first MOSFET region (40) is recessed prior to forming the metal-containing layer (56) so that the height of the first MOSFET semiconductor stack is less than the height of the second MOSFET semiconductor stack. In another embodiment, the metal-containing layer (56) is thinned over a first type MOSFET region (40) relative to a second type MOSFET region (30) prior to the conversion process.
Abstract:
A structure, a FET, a method of making the structure and of making the FET. The structure including: a silicon layer (105; Fig. 5) on a buried oxide (BOX) layer (115) of a silicon-on-insulator substrate (100); a trench in the silicon layer extending from a top surface of the silicon layer into the silicon layer, the trench not extending to the BOX layer (160, 165, and 170), a doped region (155) in the silicon layer between and abutting the BOX layer and a bottom of the trench, the first doped region doped to a first dopant concentration; a first epitaxial layer (160), doped to a second dopant concentration, in a bottom of the trench; a second epitaxial layer (165), doped to a third dopant concentration, on the first epitaxial layer in the trench; and wherein the third dopant concentration is greater than the first and second dopant concentrations and the first dopant concentration is greater than the second dopant concentration.
Abstract:
Eine Struktur, ein FET, ein Verfahren zum Herstellen der Struktur und zum Herstellen des FET. Die Struktur beinhaltet: eine Siliciumschicht (105; 5) auf einer vergrabenen Oxid(BOX)-Schicht (115) eines Silicium-auf-Isolator-Substrats (100); einen Graben in der Siliciumschicht, der sich von einer Oberseite der Siliciumschicht in die Siliciumschicht hinein erstreckt, wobei sich der Graben nicht bis zu der BOX-Schicht (160, 165, und 170) erstreckt, einen dotierten Bereich (155) in der Siliciumschicht zwischen der BOX-Schicht und einem Boden des Grabens und an diese angrenzend, wobei der erste dotierte Bereich bis zu einer ersten Dotierstoffkonzentration dotiert ist; eine erste epitaxiale Schicht (160) in einem Boden des Grabens, die bis zu einer zweiten Dotierstoffkonzentration dotiert ist; eine zweite epitaxiale Schicht (165) auf der ersten epitaxialen Schicht in dem Graben, die bis zu einer dritten Dotierstoffkonzentration dotiert ist; und wobei die dritte Dotierstoffkonzentration höher als die erste und zweite Dotierstoffkonzentration ist und die erste Dotierstoffkonzentration höher als die zweite Dotierstoffkonzentration ist.
Abstract:
A structure, a FET, a method of making the structure and of making the FET. The structure including: a silicon layer (105; Fig. 5) on a buried oxide (BOX) layer (115) of a silicon-on-insulator substrate (100); a trench in the silicon layer extending from a top surface of the silicon layer into the silicon layer, the trench not extending to the BOX layer (160, 165, and 170), a doped region (155) in the silicon layer between and abutting the BOX layer and a bottom of the trench, the first doped region doped to a first dopant concentration; a first epitaxial layer (160), doped to a second dopant concentration, in a bottom of the trench; a second epitaxial layer (165), doped to a third dopant concentration, on the first epitaxial layer in the trench; and wherein the third dopant concentration is greater than the first and second dopant concentrations and the first dopant concentration is greater than the second dopant concentration.