Abstract:
PROBLEM TO BE SOLVED: To provide an improved method for growing high quality oxide on a composite face of a silicon substrate having at least two crystal orientations. SOLUTION: Formation of a vertical MOS transistor on a silicon wafer or formation of another 3 dimensional integrated circuit structure expose two faces having at least two different crystal orientations. Since interatomic spaces are different for the different faces, the oxides on the different crystal faces grow at essentially different speeds. When the silicon is heated in a nitrogen-containing atmosphere to form a thin layer of nitrogen, and then the oxide is grown via a thin nitrided layer, variations of the thickness of the oxide are reduced to less than 1 %. COPYRIGHT: (C)2004,JPO
Abstract:
PROBLEM TO BE SOLVED: To provide a method for forming a uniform layer structure, including an ultra-thin layer of amorphous silicon and a thermal oxide thereof. SOLUTION: In one side surface, the present invention is a method for forming the nano-laminate of an oxidized silicon on a substrate. In the other side surface, the invention is a method for forming a patterned hard mask on the substrate. The patterned hard mask includes the nano-laminate of a silicon and the oxidized silicon. The methods are characterized by the oxidization of an amorphous silicon layer using atomic oxygen. COPYRIGHT: (C)2004,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide an SRAM cell design capable of simultaneously attaining high performance, low power, and small chip size by using only vertical MOSFET device including a peripheral (transmission) gate. SOLUTION: A method for forming a SRAM cell device comprises the steps of forming a pass gate FET transistor in a silicon layer formed on a flat insulating material and a parallel island, and further forming a pair of vertical pulldown FET transistors having a first common body and a first common source region. The method further forms a pulldown separation space for dividing an upper layer of a pullup and pulldown drain region of a pair of vertical pulldown FET transistor in two by etching through the upper diffusion between cross-linked inverter FET transistors, and the separation space reaches the common boby layer. The method further comprises the steps of forming a pair of vertical pullup FET transistor having a second common body and a second common drain, and connecting the FET transistor so as to form a SRAM cell. COPYRIGHT: (C)2004,JPO&NCIPI
Abstract:
Disclosed is a method to convert a stable silicon nitride film (101)covering a silicon substrate (100) into a stable silicon oxide film (102) with a low content of residual nitrogen in the resulting silicon oxide film. This is achieved by performing the steps of (i)providing a low pressure environment for the silicon nitride fim of between about l.33 X10 Pa(100 Torr) to about 13.3 Pa (0.1 Torr);(ii)introducing hydrogen and oxygen into said low pressure environment; and iii maintaining said low pressure environment at a temperature of about 600°C to about 1200 C° for a predetermined amount of time. This is an unexpectedand unique property of the in situ steam generation process since both silicon nitride and silicon oxide materials are chemically very stable compounds. Application of the claimed method to the art of microelectronic device fabrication, such as fabrication of on-chip dielectric capacitors and metal insulator semiconductor field effect transistors, is also disclosed.
Abstract:
A method for increasing the level of stress for amorphous thin film stressors by means of modifying the internal structure of such stressors is provided. The method includes first forming a first portion of an amorphous film stressor material (14) on at least a surface of a substrate (12), said first portion (18) having a first state of mechanical strain defining a first stress value. After the forming step, the first portion of the amorphous film stressor material is densified (20) such that the first state of mechanical strain is not substantiaUydtered,\vhile increasing the first stress value. In some embodiments, the steps of forming and densifying are repeated any number of times (20, 2OA, 20B) to obtain a preselected and desired thickness for the stressor.
Abstract:
PROBLEM TO BE SOLVED: To provide a structure to resolve problems in word line continuity and support region punch-through, and to provide a manufacturing method therefor. SOLUTION: An integrated circuit comprises at least one semiconductor memory array and a logic circuit. The memory array includes conductive word lines. The logic circuit includes a logic transistor having a conductive gate. The gate of the logic transistor and the word lines are composed of polysilicon and metal layers. In the word lines, the metal layer is thicker than the polysilicon layer. In the gate of the logic transistor, the metal layer is thinner than the polysilicon layer. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a gate structure for MOSFETs for application of the CMOS technology, etc., which is durable against high temperature processes such as junction activation, etc., and reduces the gate propagation delay. SOLUTION: The gate structure 10 has an insulation layer 14 on a semiconductor substrate 12, and a polysilicon gate electrode 16 on the insulation layer 14. The gate structure 10 comprises a diffused barrier layer 20 having semi- insulative characteristics on the gate electrode 16, and a gate conductor 18 on the barrier layer 20. The conductor 18 is electrically contacted to the gate electrode 16. The constitution and the thickness of the barrier layer 20 are adjusted so as to effectively block the diffusion and the mixing between the gate conductor 18 and the gate electrode 16, but realize a capacitive coupling and/or a leak current not so increasing the gate propagation delayer of the gate surface 10.
Abstract:
The present invention provides a semiconductor structure having at least one CMOS device in which the Miller capacitances, i-e., overlap capacitances, are reduced and the drive current is improved. The inventive structure includes a semiconductor substrate having at least one overlaying gate conductor, each of the at least one overlaying gate conductors has vertical edges; a first gate oxide located beneath the at least one overlaying gate conductor, the first gate oxide not extending beyond the vertical edges of the at least overlaying gate conductor; and a second gate oxide located beneath at least a portion of the at one overlaying gate conductor. In accordance with the present invention, the first gate oxide and the second gate oxide are selected from high k oxide-containing materials and low k oxide-containing materials, and the first gate oxide is higher k than the second gate oxide or vice-versa.
Abstract:
A method of fabricating a semiconductor device structure, includes: providing a substrate (1), providing an electrode (6) on the substrate (1), forming a recess (12) in the electrode (6), the recess having an opening, disposing a small grain semiconductor material (17) within the recess, covering the opening to contain the small grain semiconductor material, within the recess, and then annealing the resultant structure.