Charge Carrier Lifetime Control Patents (Class 438/904)
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Patent number: 8772878Abstract: A silicon/germanium material and a silicon/carbon material may be provided in transistors of different conductivity type on the basis of an appropriate manufacturing regime without unduly contributing to overall process complexity. Furthermore, appropriate implantation species may be provided through exposed surface areas of the cavities prior to forming the corresponding strained semiconductor alloy, thereby additionally contributing to enhanced overall transistor performance. In other embodiments a silicon/carbon material may be formed in a P-channel transistor and an N-channel transistor, while the corresponding tensile strain component may be overcompensated for by means of a stress memorization technique in the P-channel transistor. Thus, the advantageous effects of the carbon species, such as enhancing overall dopant profile of P-channel transistors, may be combined with an efficient strain component while enhanced overall process uniformity may also be accomplished.Type: GrantFiled: January 31, 2012Date of Patent: July 8, 2014Assignee: GLOBALFOUNDRIES Inc.Inventors: Jan Hoentschel, Vassilios Papageorgiou, Belinda Hannon
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Patent number: 8502284Abstract: The semiconductor device includes a silicon substrate having a channel region, a gate electrode formed over the channel region, buried semiconductor regions formed in a surface of the silicon substrate on both sides of the gate electrode, for applying to the surface of the silicon substrate a first stress in a first direction parallel to the surface of the silicon substrate, and stressor films formed on the silicon substrate between the channel region and the buried semiconductor regions in contact with the silicon substrate, for applying to the silicon substrate a second stress in a second direction which is opposite to the first direction.Type: GrantFiled: June 30, 2009Date of Patent: August 6, 2013Assignee: Fujitsu Semiconductor LimitedInventor: Naoyoshi Tamura
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Patent number: 7534666Abstract: A process for forming an NPT IGBT in a thin N type silicon wafer in which the bottom surface of a thin silicon wafer (100 microns thick or less) has a shallow reduced lifetime region in its bottom formed by a light species atom implant to a depth of less than about 2.5 microns. A P+ transparent collector region about 0.5 microns deep is formed in the bottom of the damaged region by a boron implant. A collector contact of Al/Ti/NiV and Ag is sputtered onto the collector region and is annealed at 200° C. to 400° C. for 30 to 60 minutes. A pre-anneal step before applying the collector metal can be carried out in vacuum at 300° C. to 400° C. for 30 to 60 seconds.Type: GrantFiled: July 27, 2005Date of Patent: May 19, 2009Assignee: International Rectifier CorporationInventors: Richard Francis, Chiu Ng
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Patent number: 7510985Abstract: A method is described for the manufacture of structured flexible metallic patterns in which a metallic layer on a flexible substrate is structured using laser ablation. The flexible patterns manufactured in this fashion may be used as interposers (strap) for RFID tags or RFID antennas.Type: GrantFiled: October 26, 2005Date of Patent: March 31, 2009Assignee: LPKF Laser & Electronics AGInventors: Andreas Boenke, Dieter J. Meier
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Patent number: 7473622Abstract: To provide a laser apparatus and a laser annealing method with which a crystalline semiconductor film with a larger crystal grain size is obtained and which are low in their running cost. A solid state laser easy to maintenance and high in durability is used as a laser, and laser light emitted therefrom is linearized to increase the throughput and to reduce the production cost as a whole. Further, both the front side and the back side of an amorphous semiconductor film is irradiated with such laser light to obtain the crystalline semiconductor film with a larger crystal grain size.Type: GrantFiled: February 16, 2007Date of Patent: January 6, 2009Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Shunpei Yamazaki, Hisashi Ohtani, Koichiro Tanaka, Kenji Kasahara, Ritsuko Kawasaki
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Patent number: 6878579Abstract: An aspect of the present invention includes a first conductive type semiconductor region; a gate electrode formed on the first conductive type semiconductor region; a channel region formed immediately below the gate electrode in the first conductive type semiconductor region; and a second conductive type first diffusion layer constituting source/drain regions formed at opposite sides of the channel region in the first conductive type semiconductor region, the gate electrode being formed of polycrystalline silicon-germanium, in which a germanium concentration is continuously increased from a drain region side to a source region side, and an impurity concentration immediately below the gate electrode in the first conductive type semiconductor region being continuously increased from the source region side to the drain region side in accordance with the germanium concentration in the gate electrode.Type: GrantFiled: August 13, 2004Date of Patent: April 12, 2005Assignee: Kabushiki Kaisha ToshibaInventors: Kazuya Ohuchi, Hironobu Fukui
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Patent number: 6759336Abstract: Methods for reducing contamination of semiconductor substrates after processing are provided. The methods include heating the processed substrate to remove absorbed chemical species from the substrate surface by thermal desorption. Thermal desorption can be performed either in-situ or ex-situ. The substrate can be heated by convection, conduction, and/or radiant heating. The substrate can also be heated by treating the surface of the processed substrate with an inert plasma during which treatment ions in the plasma bombard the substrate surface raising the temperature thereof. Thermal desorption can also be performed ex-situ by applying thermal energy to the substrate during transport of the substrate from the processing chamber and/or by transporting the substrate to a transport module (e.g., a load lock) or to a second processing chamber for heating. Thermal desorption during transport can be enhanced by purging an inert gas over the substrate surface.Type: GrantFiled: November 18, 2002Date of Patent: July 6, 2004Assignee: Lam Research CorporationInventors: Robert Chebi, David Hemker
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Patent number: 6703327Abstract: An improved process for annealing integrated circuits to repair fabrication-induced damage. An integrated circuit is annealed in a pressurized sealed chamber in which a forming gas comprising hydrogen is present. Pressurization of the chamber reduces the contribution made by the final anneal step to total thermal exposure by increasing the diffusion rate of the hydrogen into the materials from which the integrated circuit is fabricated. Ideally, the forming gas contains, in addition to hydrogen, at least one other gas such as nitrogen or argon that will not react with hydrogen and, thus, reduces the danger of explosion. However, the integrated circuit may be annealed in an ambiance containing only hydrogen gas that is maintained at a pressure greater than ambient atmospheric pressure.Type: GrantFiled: June 13, 2002Date of Patent: March 9, 2004Assignee: Micron Technology, Inc.Inventors: Richard H. Lane, Phillip G. Wald
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Patent number: 6391805Abstract: This invention embodies an improved process for annealing integrated circuits to repair fabrication-induced damage. An integrated circuit is annealed in a pressurized sealed chamber in which a forming gas comprising hydrogen is present. Pressurization of the chamber reduces the contribution made by the final anneal step to total thermal exposure by increasing the diffusion rate of the hydrogen into the materials from which the integrated circuit is fabricated. Ideally, the forming gas contains, in addition to hydrogen, at least one other gas such as nitrogen or argon that will not react with hydrogen and, thus, reduce the danger of explosion. However, the integrated circuit may be annealed in an ambiance containing only hydrogen gas that is maintained at a pressure greater than ambient atmospheric pressure.Type: GrantFiled: August 31, 2000Date of Patent: May 21, 2002Assignee: Micron Technology, Inc.Inventors: Richard H. Lane, Phillip G. Wald
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Patent number: 6387828Abstract: This invention embodies an improved process for annealing integrated circuits to repair fabrication-induced damage. An integrated circuit is annealed in a pressurized sealed chamber in which a forming gas comprising hydrogen is present. Pressurization of the chamber reduces the contribution made by the final anneal step to total thermal exposure by increasing the diffusion rate of the hydrogen into the materials from which the integrated circuit is fabricated. Ideally, the forming gas contains, in addition to hydrogen, at least one other gas such as nitrogen or argon that will not react with hydrogen and, thus, reduce the danger of explosion. However, the integrated circuit may be annealed in an ambiance containing only hydrogen gas that is maintained at a pressure greater than ambient atmospheric pressure.Type: GrantFiled: August 31, 2000Date of Patent: May 14, 2002Assignee: Micron Technology, Inc.Inventors: Richard H. Lane, Phillip G. Wald
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Patent number: 6352946Abstract: This invention embodies an improved process for annealing integrated circuits to repair fabrication-induced damage. An integrated circuit is annealed in a pressurized sealed chamber in which a forming gas comprising hydrogen is present. Pressurization of the chamber reduces the contribution made by the final anneal step to total thermal exposure by increasing the diffusion rate of the hydrogen into the materials from which the integrated circuit is fabricated. Ideally, the forming gas contains, in addition to hydrogen, at least one other gas such as nitrogen or argon that will not react with hydrogen and, thus, reduce the danger of explosion. However, the integrated circuit may be annealed in an ambiance containing only hydrogen gas that is maintained at a pressure greater than ambient atmospheric pressure.Type: GrantFiled: February 24, 1999Date of Patent: March 5, 2002Assignee: Micron Technology, Inc.Inventors: Richard H. Lane, Phillip G. Wald
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Patent number: 6187632Abstract: A memory cell of EEPROM having a floating gate, a control gate, a drain region, and a source region is formed on a silicon substrate. Thereafter, a BPSG film (interlayer insulating film) covering the memory cell is formed by CVD. After a wire including a bit line, an SiON film (passivation film), covering the silicon substrate and serving as an uppermost layer, is formed on an upper portion of the silicon substrate. Thereafter, annealing is performed to discharge water in the BPSG film to an outer portion of an LSI. The annealing is performed under a condition satisfying the following equation of t≧7.86×10−11×L2×exp (9115/T) where t is anneal time (minutes), L is a thickness (nm) of the passivation film, and T is anneal temperature (absolute temperature). Thereby, an amount of electronic trap in a gate oxide film of the transistor can be reduced.Type: GrantFiled: December 19, 1997Date of Patent: February 13, 2001Assignee: Kabushiki Kaisha ToshibaInventors: Susumu Shuto, Miwa Tanaka, Masahisa Sonoda, Toshiaki Idaka, Kenichi Sasaki, Seiichi Mori
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Patent number: 5910257Abstract: A process for the preparation of an analytical sample characterized by depositing and separating solely the impurity to be analyzed from phosphoric acid; a process for analysis of the impurity characterized by depositing and separating solely the impurity from phosphoric acid and applying the separated material to analysis; a process for preparation of high grade phosphoric acid characterized by depositing and separating solely the impurity from phosphoric acid to be purified; a process for the fabrication of a semiconductor device characterized by using phosphoric acid, the impurity content of which is not more than 10.sup.-3 Bq/mL, defined by the concentration of a contained radioactive element selected from the group consisting of Pb, Bi and Po, as a processing solution.Type: GrantFiled: April 25, 1996Date of Patent: June 8, 1999Assignee: Fujitsu LimitedInventors: Hiroyuki Fukuda, Takashi Nakanishi, Mitsuru Hirose
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Patent number: 5851847Abstract: A photonic device according to the present inventions obtained by resin molding a photonic element mounted on a base using a light-transmitting resin wherein the cured hardness of the light-transmitting resin is set at a value for optimally minimizing the adhesion of dust particles on the surface of the light-transmitting resin and the generation rate of internal cracks of the light-transmitting resin for a predetermined temperature change on the basis of the correlation between the two. A process for fabricating a photonic device according to the present invention comprises resin molding a photonic element by potting a light-transmitting resin having a predetermined viscosity, and applying a predetermined heat treatment for curing the resin to a final hardness after driving out the bubbles from the inside of the light-transmitting resin and for relaxing the curing shrinkage stress.Type: GrantFiled: June 10, 1997Date of Patent: December 22, 1998Assignee: Sony CorporationInventor: Hideo Yamanaka
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Patent number: 5747371Abstract: A semiconductor device includes a substrate (11), a first region (21) in the substrate (11) wherein the first region (21) has a first conductivity type, a second region (22) in the substrate (11) wherein the second region (22) is adjacent to the first region (21) and wherein the second region (22) has a second conductivity type different from the first conductivity type, and a third region (24) in the substrate (11) wherein the third region (24) overlaps the first and second regions (21, 22) and wherein the third region (24) has a damaged crystalline structure.Type: GrantFiled: July 22, 1996Date of Patent: May 5, 1998Assignee: Motorola, Inc.Inventors: Francine Y. Robb, Stephen P. Robb, Jean-Michel Reynes, Li-Hsin Chang
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Patent number: 5624852Abstract: Integrated structure bipolar transistors with controlled storage time are manufactured by forming at least one bipolar transistor occupying a first area on a first surface of the silicon material, covering the first surface of the silicon material with an insulating material layer, and selectively removing the insulating material layer to open a window. The window has a second area much smaller than the first area occupied by the bipolar transistor. Therefore, by implanting into the silicon material a medium dose of platinum ions through the window and diffusing into the silicon material the implanted platinum ions, a uniform distribution of platinum inside the transistor is obtained.Type: GrantFiled: March 21, 1995Date of Patent: April 29, 1997Assignee: Consorzio per la Ricerca sulla Microelettronica nel MezzogiornoInventor: Ferruccio Frisina