Patents by Inventor Tetsuo Yaegashi

Tetsuo Yaegashi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 8581249
    Abstract: A semiconductor substrate includes a wafer, a first stepped structure formed of plural stepped parts formed on a surface of the wafer with a first area occupation ratio, a second stepped structure formed of plural stepped parts formed on the surface of the wafer with a second, different area occupation ratio, and an interlayer insulation film formed on the surface so as to cover the first and second stepped structures, the interlayer insulation film having a planarized top surface, wherein there are provided at least first and second film-thickness monitoring patterns for monitoring film thickness on the surface in a manner covered by the interlayer insulation film, a first pattern group is formed on the surface such that the first pattern group comprises plural patterns disposed so as to surround the first film-thickness monitoring pattern, a second pattern group is formed on the surface such that the second pattern group comprises plural patterns disposed so as to surround the second film-thickness monitori
    Type: Grant
    Filed: August 25, 2009
    Date of Patent: November 12, 2013
    Assignee: Fujitsu Semiconductor Limited
    Inventors: Tetsuo Yaegashi, Kouichi Nagai
  • Patent number: 8513130
    Abstract: A semiconductor substrate includes a wafer including an element area and a non-element area delineating the element area, a first layered structure situated in the element area, a first insulating film covering the first layered structure, and exhibiting a first etching rate with respect to an etching recipe, a second insulating film covering the first layered structure covered by the first insulating film in the element area, and exhibiting a second etching rate with respect to the etching recipe, the second etching rate being greater than the first etching rate, and a second layered structure situated in the non-element area, wherein the second layered structure includes at least a portion of the first layered structure.
    Type: Grant
    Filed: February 24, 2011
    Date of Patent: August 20, 2013
    Assignee: Fujitsu Semiconductor Limited
    Inventor: Tetsuo Yaegashi
  • Publication number: 20110143459
    Abstract: A semiconductor substrate includes a wafer including an element area and a non-element area delineating the element area, a first layered structure situated in the element area, a first insulating film covering the first layered structure, and exhibiting a first etching rate with respect to an etching recipe, a second insulating film covering the first layered structure covered by the first insulating film in the element area, and exhibiting a second etching rate with respect to the etching recipe, the second etching rate being greater than the first etching rate, and a second layered structure situated in the non-element area, wherein the second layered structure includes at least a portion of the first layered structure.
    Type: Application
    Filed: February 24, 2011
    Publication date: June 16, 2011
    Applicant: FUJITSU SEMICONDUCTOR LIMITED
    Inventor: Tetsuo Yaegashi
  • Patent number: 7915172
    Abstract: A semiconductor substrate includes a wafer including an element area and a non-element area delineating the element area, a first layered structure situated in the element area, a first insulating film covering the first layered structure, and exhibiting a first etching rate with respect to an etching recipe, a second insulating film covering the first layered structure covered by the first insulating film in the element area, and exhibiting a second etching rate with respect to the etching recipe, the second etching rate being greater than the first etching rate, and a second layered structure situated in the non-element area, wherein the second layered structure includes at least a portion of the first layered structure.
    Type: Grant
    Filed: August 22, 2006
    Date of Patent: March 29, 2011
    Assignee: Fujitsu Semiconductor Limited
    Inventor: Tetsuo Yaegashi
  • Patent number: 7652377
    Abstract: A seal ring (102) is formed in a manner to surround each ferroelectric capacitor (101). Additionally, a seal ring (103) is formed in a manner to surround a plurality of ferroelectric capacitors (101). Further, a seal ring (104) is formed in a manner to surround all of the ferroelectric capacitors (101) and along a dicing line (110) inside the dicing line (110).
    Type: Grant
    Filed: September 18, 2006
    Date of Patent: January 26, 2010
    Assignee: Fujitsu Microelectronics Limited
    Inventors: Tetsuo Yaegashi, Kouichi Nagai
  • Patent number: 7642103
    Abstract: Dicing lines extending longitudinally and transversely, and chip areas surrounded by the dicing lines are formed in a resist mask. Critical-dimension patterns are formed in the dicing lines so as to be paired while placing the center line thereof in between. The dimensional measurement of the resist film having these patterns formed therein is made under a CD-SEM, by specifying a measurement-target chip area out of a plurality of chip areas, and by specifying a position of a critical-dimension pattern on the left thereof. Then, the distance of two linear portions configuring the critical-dimension pattern is measured, wherein a portion at a point of measurement on the measurement-target chip area side as viewed from the center line of the dicing line is measured.
    Type: Grant
    Filed: June 26, 2008
    Date of Patent: January 5, 2010
    Assignee: Fujitsu Microelectronics Limited
    Inventor: Tetsuo Yaegashi
  • Publication number: 20090315028
    Abstract: A semiconductor substrate includes a wafer, a first stepped structure formed of plural stepped parts formed on a surface of the wafer with a first area occupation ratio, a second stepped structure formed of plural stepped parts formed on the surface of the wafer with a second, different area occupation ratio, and an interlayer insulation film formed on the surface so as to cover the first and second stepped structures, the interlayer insulation film having a planarized top surface, wherein there are provided at least first and second film-thickness monitoring patterns for monitoring film thickness on the surface in a manner covered by the interlayer insulation film, a first pattern group is formed on the surface such that the first pattern group comprises plural patterns disposed so as to surround the first film-thickness monitoring pattern, a second pattern group is formed on the surface such that the second pattern group comprises plural patterns disposed so as to surround the second film-thickness monitori
    Type: Application
    Filed: August 25, 2009
    Publication date: December 24, 2009
    Applicant: Fujitsu Microelectronics Limited,
    Inventors: Tetsuo Yaegashi, Kouichi Nagai
  • Patent number: 7598522
    Abstract: A semiconductor substrate includes a wafer, a first stepped structure formed of plural stepped parts formed on a surface of the wafer with a first area occupation ratio, a second stepped structure formed of plural stepped parts formed on the surface of the wafer with a second, different area occupation ratio, and an interlayer insulation film formed on the surface so as to cover the first and second stepped structures, the interlayer insulation film having a planarized top surface, wherein there are provided at least first and second film-thickness monitoring patterns for monitoring film thickness on the surface in a manner covered by the interlayer insulation film, a first pattern group is formed on the surface such that the first pattern group comprises plural patterns disposed so as to surround the first film-thickness monitoring pattern, a second pattern group is formed on the surface such that the second pattern group comprises plural patterns disposed so as to surround the second film-thickness monitori
    Type: Grant
    Filed: September 12, 2006
    Date of Patent: October 6, 2009
    Assignee: Fujitsu Microelectronics Limited
    Inventors: Tetsuo Yaegashi, Kouichi Nagai
  • Publication number: 20080274568
    Abstract: Dicing lines extending longitudinally and transversely, and chip areas surrounded by the dicing lines are formed in a resist mask. Critical-dimension patterns are formed in the dicing lines so as to be paired while placing the center line thereof in between. The dimensional measurement of the resist film having these patterns formed therein is made under a CD-SEM, by specifying a measurement-target chip area out of a plurality of chip areas, and by specifying a position of a critical-dimension pattern on the left thereof. Then, the distance of two linear portions configuring the critical-dimension pattern is measured, wherein a portion at a point of measurement on the measurement-target chip area side as viewed from the center line of the dicing line is measured.
    Type: Application
    Filed: June 26, 2008
    Publication date: November 6, 2008
    Applicant: FUJITSU LIMITED
    Inventor: Tetsuo Yaegashi
  • Patent number: 7405025
    Abstract: Dicing lines extending longitudinally and transversely, and chip areas surrounded by the dicing lines are formed in a resist mask. Critical-dimension patterns are formed in the dicing lines so as to be paired while placing the center line thereof in between. The dimensional measurement of the resist film having these patterns formed therein is made under a CD-SEM, by specifying a measurement-target chip area out of a plurality of chip areas, and by specifying a position of a critical-dimension pattern on the left thereof. Then, the distance of two linear portions configuring the critical-dimension pattern is measured, wherein a portion at a point of measurement on the measurement-target chip area side as viewed from the center line of the dicing line is measured.
    Type: Grant
    Filed: February 28, 2005
    Date of Patent: July 29, 2008
    Assignee: Fujitsu Limited
    Inventor: Tetsuo Yaegashi
  • Patent number: 7332357
    Abstract: A conduction film 36 is formed in a larger design thickness value on a ferroelectric film 32 by MOCVD, and the entire surface of the conduction film 36 is anisotropically etched back, whereby the surface morphology of the conduction film 36 can be improved. The conduction film 36, whose surface morphology has been improved and which has been flattened, can be patterned by photolithography without the reflection of the incident exposure light in various directions, and a desired pattern as designed can be formed. The method for fabricating a semiconductor device can improve the surface morphology of a ferroelectric film formed by organic metal chemical vapor deposition.
    Type: Grant
    Filed: August 29, 2005
    Date of Patent: February 19, 2008
    Assignee: Fujitsu Limited
    Inventors: Yuriko Kokubun, Tetsuo Yaegashi
  • Publication number: 20070202446
    Abstract: In the step of removing the photo-resist film formed on a substrate, dry ice particles, with a predetermined particle size, are blasted onto the photo-resist film at a predetermined pressure in a state of heating the substrate at room temperature or higher, such as 30 to 200° C., preferably at about 100° C.
    Type: Application
    Filed: June 2, 2006
    Publication date: August 30, 2007
    Applicant: FUJITSU LIMITED
    Inventors: Osamu Takahashi, Tetsuo Yaegashi
  • Patent number: 7232764
    Abstract: The semiconductor device fabrication method comprises the step of forming a first insulation film 48 on a semiconductor substrate 10 and a ferroelectric capacitor 42; the step of forming first interconnections 56a–56c; the step of forming a second insulation film 60; the step of planarizing the surface of the second insulation film 60; the step of making heat treatment with a heat treatment furnace to remove water from the second insulation film 60; the step of making heat treatment in a plasma atmosphere generated by using N2O gas or N2 gas; the step of removing water from the second insulation film 60 and nitriding the surface of the second insulation film 60; the step of forming a barrier film 62 on the second insulation film 60; the step of forming contact holes 68 in the barrier film 62 and the second insulation film 60; and the step of burying conductor plugs 70 in the contact holes 68.
    Type: Grant
    Filed: March 3, 2006
    Date of Patent: June 19, 2007
    Assignee: Fujitsu Limited
    Inventor: Tetsuo Yaegashi
  • Publication number: 20070134924
    Abstract: The semiconductor device fabrication method comprises the step of forming a first insulation film 48 on a semiconductor substrate 10 and a ferroelectric capacitor 42; the step of forming first interconnections 56a-56c; the step of forming a second insulation film 60; the step of planarizing the surface of the second insulation film 60; the step of making heat treatment with a heat treatment furnace to remove water from the second insulation film 60; the step of making heat treatment in a plasma atmosphere generated by using N2O gas or N2 gas; the step of removing water from the second insulation film 60 and nitriding the surface of the second insulation film 60; the step of forming a barrier film 62 on the second insulation film 60; the step of forming contact holes 68 in the barrier film 62 and the second insulation film 60; and the step of burying conductor plugs 70 in the contact holes 68.
    Type: Application
    Filed: March 3, 2006
    Publication date: June 14, 2007
    Applicant: FUJITSU LIMITED
    Inventor: Tetsuo Yaegashi
  • Publication number: 20070012976
    Abstract: A seal ring (102) is formed in a manner to surround each ferroelectric capacitor (101). Additionally, a seal ring (103) is formed in a manner to surround a plurality of ferroelectric capacitors (101). Further, a seal ring (104) is formed in a manner to surround all of the ferroelectric capacitors (101) and along a dicing line (110) inside the dicing line (110).
    Type: Application
    Filed: September 18, 2006
    Publication date: January 18, 2007
    Applicant: FUJITSU LIMITED
    Inventors: Tetsuo Yaegashi, Kouichi Nagai
  • Publication number: 20070007567
    Abstract: A semiconductor substrate includes a wafer, a first stepped structure formed of plural stepped parts formed on a surface of the wafer with a first area occupation ratio, a second stepped structure formed of plural stepped parts formed on the surface of the wafer with a second, different area occupation ratio, and an interlayer insulation film formed on the surface so as to cover the first and second stepped structures, the interlayer insulation film having a planarized top surface, wherein there are provided at least first and second film-thickness monitoring patterns for monitoring film thickness on the surface in a manner covered by the interlayer insulation film, a first pattern group is formed on the surface such that the first pattern group comprises plural patterns disposed so as to surround the first film-thickness monitoring pattern, a second pattern group is formed on the surface such that the second pattern group comprises plural patterns disposed so as to surround the second film-thickness monitori
    Type: Application
    Filed: September 12, 2006
    Publication date: January 11, 2007
    Applicant: FUJITSU LIMITED
    Inventors: Tetsuo Yaegashi, Kouichi Nagai
  • Patent number: 7160737
    Abstract: A material of low viscosity is applied to a ferroelectric film 32 formed by MOCVD to form a buried layer 34. Then, anisotropic etching is made on the entire surface to remove the tops of convexities on the surface of the ferroelectric film 32, and the buried layer 34 remaining on the surface of the ferroelectric film 32 is removed. Thus, the surface morphology of the ferroelectric film 32 is improved and planarized. When the conduction film 36 and the ferroelectric film 32 are patterned by photolithography, prescribed patterns as designed can be formed without reflecting the incident exposure light in various directions. The method for fabricating a semiconductor device improves the surface morphology of the ferroelectric film formed by metal organic chemical vapor deposition.
    Type: Grant
    Filed: May 18, 2005
    Date of Patent: January 9, 2007
    Assignee: Fujitsu Limited
    Inventor: Tetsuo Yaegashi
  • Publication number: 20060281300
    Abstract: A semiconductor substrate includes a wafer including an element area and a non-element area delineating the element area, a first layered structure situated in the element area, a first insulating film covering the first layered structure, and exhibiting a first etching rate with respect to an etching recipe, a second insulating film covering the first layered structure covered by the first insulating film in the element area, and exhibiting a second etching rate with respect to the etching recipe, the second etching rate being greater than the first etching rate, and a second layered structure situated in the non-element area, wherein the second layered structure includes at least a portion of the first layered structure.
    Type: Application
    Filed: August 22, 2006
    Publication date: December 14, 2006
    Applicant: FUJITSU LIMITED
    Inventor: Tetsuo Yaegashi
  • Patent number: 7115994
    Abstract: A semiconductor substrate includes a wafer including an element area and a non-element area delineating the element area, a first layered structure situated in the element area, a first insulating film covering the first layered structure, and exhibiting a first etching rate with respect to an etching recipe, a second insulating film covering the first layered structure covered by the first insulating film in the element area, and exhibiting a second etching rate with respect to the etching recipe, the second etching rate being greater than the first etching rate, and a second layered structure situated in the non-element area, wherein the second layered structure includes at least a portion of the first layered structure.
    Type: Grant
    Filed: August 10, 2004
    Date of Patent: October 3, 2006
    Assignee: Fujitsu Limited
    Inventor: Tetsuo Yaegashi
  • Publication number: 20060148107
    Abstract: A material of low viscosity is applied to a ferroelectric film 32 formed by MOCVD to form a buried layer 34. Then, anisotropic etching is made on the entire surface to remove the tops of convexities on the surface of the ferroelectric film 32, and the buried layer 34 remaining on the surface of the ferroelectric film 32 is removed. Thus, the surface morphology of the ferroelectric film 32 is improved and planarized. When the conduction film 36 and the ferroelectric film 32 are patterned by photolithography, prescribed patterns as designed can be formed without reflecting the incident exposure light in various directions. The method for fabricating a semiconductor device improves the surface morphology of the ferroelectric film formed by metal organic chemical vapor deposition.
    Type: Application
    Filed: May 18, 2005
    Publication date: July 6, 2006
    Applicant: FUJITSU LIMITED
    Inventor: Tetsuo Yaegashi