Abstract:
A dual gate extremely thin semiconductor-on-insulator transistor with asymmetric gate dielectrics is provided. This structure can improve the sensor detection limit and also relieve the drift effects. Detection is performed at a constant current mode while the species will be detected at a gate electrode with a thin equivalent oxide thickness (EOT) and the gate bias will be applied to the second gate electrode with thicker EOT to maintain current flow through the transistor. As a result, a small change in the charge on the first electrode with the thin EOT will be translated into a larger voltage on the gate electrode with the thick EOT to sustain the current flow through the transistor. This allows a reduction of the sensor dimension and therefore an increase in the array size. The dual gate structure further includes cavities, i.e., microwell arrays, for chemical sensing.
Abstract:
PROBLEM TO BE SOLVED: To form a patterned silicon-on-insulator (SOI)/silicon-on-nothing (SON) composite structure by a porous Si technique. SOLUTION: A patterned SOI/SON composite structure and a method of forming the same are provided. In the SOI/SON composite structure, a patterned SOI/SON structure is sandwiched between an Si overlayer and a semiconductor substrate. The method of forming the patterned SOI/SON composite structure includes a shared processing treatment step wherein both SOI and SON structures are formed. This invention further provides a method of forming a composite structure including an embedded conductive/SON structure, and a method of forming a composite structure including only an embedded void plane. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method for suppressing the formation of flat surface defects, such as stacking faults and microtwins in a relaxed SiGe alloy layer. SOLUTION: There is disclosed the method of manufacturing a substantially-relaxed SiGe alloy layer, in which flat surface defect density is decreased. The method comprises the steps of forming a strained Ge-containing layer on the front surface of an Si-containing substrate, implanting ions into the interface of the Ge-containing layer/the Si-containing substrate or under the interface, and forming the substantially-relaxed SiGe alloy layer, in which the flat surface defect density is decreased. Further, there are also provided a substantially relaxed SiGe-on-insulator, having an SiGe layer in which the flat surface defect density is decreased, and a heterostructure comprising the insulator. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a method for manufacturing a super-steep retrograde well field effect transistor device, and to provide an ultra-thin body FET device manufactured by the same. SOLUTION: The method for manufacturing a super-steep retrograde well field effect transistor device starts with an SOI layer formed on a substrate, for example, an embedded oxide layer. The SOI layer is thinned so as to form an ultra-thin SOI layer. A separation trench is formed for dividing the SOI layer into an N ground layer region and a P ground layer region. The N and P ground layer regions formed in the SOI layer are doped with N-type and P-type dopants to a high concentration level. A semiconductor channel region is formed on the N and P ground layer regions. The source region and the drain region of the FET and the gate electrode stack on the channel region are formed. As desired, a diffusion retarding layer is formed between the SOI ground layer regions and the channel regions. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a CMOS structure and a method of achieving self-aligned raised source/drain for CMOS structures on SOI without relying on selective epitaxial growth of silicon. SOLUTION: In this method, CMOS structures are provided by performing sacrificial oxidation so that oxidation occurs on the surface of both the SOI and BOX interfaces. This sacrificial oxidation allows oxide spacer formation for gate-to-source/drain isolation, which enables raised source/drain fabrication without increasing contact resistance.
Abstract:
PROBLEM TO BE SOLVED: To provide a substrate for semiconductor device including a plurality of semiconductor-on-insulator (SOI) wafers that are coupled with each other in a single stack. SOLUTION: The remote end of this stack includes a first SOI region with a first semiconductor layer of a certain thickness having a first surface orientation. The surface of this single stack can further comprise a non-SOI region or at least a second SOI region, or comprise both of them. This non-SOI region can comprise a bulk silicon extending through all insulator layers of the single stack and having a thickness different from that of a first silicon layer. A second SOI region has a second semiconductor layer having a thickness different from that of the first semiconductor layer or the surface orientation different from the first surface orientation, or both different. Thus, this substrate can permit the formation of different devices on the optimum substrate region with the different surface orientation, the different thickness, the different structure from the bulk or SOI, or the combination of these different ones. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide the structure of a CMOS device and a method for manufacturing the CMOS device. SOLUTION: The manufacturing method comprises a process of sticking an SOI wafer 20 having prescribed thickness to the surface of a buried oxide (BOX) substrate 10, a process of forming a gate dielectric 25 on the surface of the SOI wafer 20, a process of forming a shallow trench isolation (STI) area 35 so as to form an almost round corner on the BOX substrate 10, a process of forming gate structure on the surface of the gate dielectric 25, a process of sticking a driving layer to the surface of the SOI wafer 20, a process for executing either one of N-type dopant implanting and P-type dopant implanting in the SOI wafer 20 and the implanting layer, and a process of forming a source/drain region 79(a) from the implanting layer and the SOI wafer 20. The source/drain region 79(a) has thickness larger than the prescribed thickness of the SOI wafer 20, and the gate dielectric is arranged lower than the STI region 35. COPYRIGHT: (C)2004,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a method of forming a substantially relaxed high-quality SiGe-on-insulator substrate material using SIMOX and Ge interdiffusion. SOLUTION: In order to form an injection rich area in a Si-containing substrate, ions are injected into Si-containing substrate at the beginning. The inplanted-ion rich region has sufficient ion concentration so that a barrier layer to disturb Ge diffusion is formed during annealing at a high temperature. Next, Ge-containing layer is formed on a surface of the Si-containing substrate, and then a heating process is performed at a temperature that enables the formation of a barrier layer, and the Ge interdiffusion. This allows a substantially relaxed single-crystal SiGe layer to be formed on the barrier layer. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a design capable of manufacturing a field-effect transistor which is fine in size and contains a sub-lithography channel length on an SOI wafer or a chip with a high degree of integration through a well-known and fully-developed process. SOLUTION: A short channel effect can be effectively restrained by the use of the impurity concentration of a steep gradient which can be accurately improved in shape and arranged at a proper position, and on the other hand, impurities are injected into a polysilicon seed adjacent to the conduction channel of a transistor and diffused into the conduction channel from the polysilicon seed to relax the allowance of a process. The polysilicon seed enables a polysilicon source/drain contact, which has a structure capable of reducing its current density and path length to an irreducible minimum and giving other mechanical advantages, to grow epitaxially from the polysilicon seed.