Patents by Inventor J. Brett Rolfson

J. Brett Rolfson 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).

  • Publication number: 20020132173
    Abstract: The present invention provides an attenuated phase shift mask (“APSM”) that, in each embodiment, includes completely transmissive regions sized and shaped to define desired semiconductor device features, slightly attenuated regions at the edges of the completely transmissive regions corresponding to isolated device features, highly attenuated regions at the edges of completely transmissive regions corresponding to closely-spaced or nested device features, and completely opaque areas where it is desirable to block transmission of all radiation through the APSM. The present invention further provides methods for fabricating the APSMs according to the present invention.
    Type: Application
    Filed: March 15, 2001
    Publication date: September 19, 2002
    Inventor: J. Brett Rolfson
  • Publication number: 20020132419
    Abstract: Disclosed are methods of forming resistors and diodes from semiconductive material, and static random access memory (SRAM) cells incorporating resistors, and to integrated circuitry incorporating resistors and diodes. A node to which electrical connection is to be made is provided. An electrically insulative layer is provided outwardly of the node. An opening is provided in the electrically insulative layer over the node. The opening is filed with semiconductive material which depending on configuration serves as one or both of a vertically elongated diode and resistor.
    Type: Application
    Filed: April 19, 2002
    Publication date: September 19, 2002
    Inventors: J. Brett Rolfson, Monte Manning
  • Patent number: 6452678
    Abstract: Disclosed is a process for analyzing the surface characteristics of opaque materials. The method comprises in one embodiment the use of a UV reflectometer to build a calibration matrix of data from a set of control samples and correlating a desired surface characteristic such as rouglness or surface area to the set of reflectances of the control samples. The UV reflectometer is then used to measure the reflectances of a test sample of unknown surface characteristics. Reflectances are taken at a variety of angles of reflection for a variety of wavelengths, preferably between about 250 nanometers to about 400 nanometers. These reflectances are then compared against the reflectances of the calibration matrix in order to correlate the closest data in the calibration matrix. By so doing, a variety of information is thereby concluded, due to the broad spectrum of wavelengths and angles of reflection used.
    Type: Grant
    Filed: August 10, 2001
    Date of Patent: September 17, 2002
    Assignee: Micron Technology, Inc.
    Inventors: Randhir P. S. Thakur, Michael Nuttall, J. Brett Rolfson, Robert James Burke
  • Patent number: 6451451
    Abstract: There are provided methods of making hardmask assemblies or other layered structures, and other masks, including providing an annular seal member between a first surface of layered structure, preferably a hardmask assembly, and a firs clamp element, the hardmask assembly comprising at least a hardmask layer; and applying a force between the first clamp element and a second clamp element to hold the hardmask assembly between the annular seal member and the second clamp element In addition, there are provided methods further comprising etching the first surface of the hardmask assembly within the bounds of an interior space defined by the annular seal member. Furthermore, there are provided methods further comprising etching the substrate layer through the hardmask layer and/or removing the hardmask layer after etching the substrate layer.
    Type: Grant
    Filed: March 27, 2001
    Date of Patent: September 17, 2002
    Assignee: Micron Technology, Inc.
    Inventor: J. Brett Rolfson
  • Patent number: 6451504
    Abstract: A semiconductor processing method of promoting adhesion of photoresist to an outer substrate layer predominately comprising silicon nitride includes, a) providing a substrate; b) providing an outer layer of Si3N4 outwardly of the substrate, the outer Si3N4 layer having an outer surface; c) covering the outer Si3N4 surface with a discrete photoresist adhesion layer; and d) depositing a layer of photoresist over the outer Si3N4 surface having the intermediate discrete adhesion layer thereover, the photoresist adhering to the Si3N4 layer with a greater degree of adhesion than would otherwise occur if the intermediate discrete adhesion layer were not present.
    Type: Grant
    Filed: January 31, 2001
    Date of Patent: September 17, 2002
    Assignee: Micron Technology, Inc.
    Inventors: J. Brett Rolfson, Annette L. Martin, Ardavan Niroomand
  • Publication number: 20020119397
    Abstract: The invention encompasses a method for forming a pattern across an expanse of photoresist. The expanse comprises a defined first region, second region and third region. The first region is exposed to a first radiation while leaving the third region not exposed; and subsequently the second region is exposed to a second radiation while leaving the third region not exposed to the second radiation. The second radiation is different from the first radiation. The exposure of the first and second regions of the expanse to the first and second radiations alters the solubility of the first and second regions in a solvent relative to the solubility of the third region of the expanse. After the first and second regions of the expanse are exposed to the first and second radiations, the expanse is exposed to a solvent to pattern the expanse. The invention can be utilized in forming radiation-patterning tools and stencils; and in pattering semiconductor substrates.
    Type: Application
    Filed: February 28, 2001
    Publication date: August 29, 2002
    Inventor: J. Brett Rolfson
  • Patent number: 6432764
    Abstract: Disclosed are methods of forming resistors and diodes from semiconductive material, and static random access memory (SRAM) cells incorporating resistors, and to integrated circuitry incorporating resistors and diodes. A node to which electrical connection is to be made is provided. An electrically insulative layer is provided outwardly of the node. An opening is provided in the electrically insulative layer over the node. The opening is filled with semiconductive material which depending on configuration serves as one or both of a vertically elongated diode and resistor.
    Type: Grant
    Filed: November 30, 1999
    Date of Patent: August 13, 2002
    Assignee: Micron Technology, Inc.
    Inventors: J. Brett Rolfson, Monte Manning
  • Patent number: 6423606
    Abstract: Disclosed are methods of forming resistors and diodes from semiconductive material, and static random access memory (SRAM) cells incorporating resistors, and to integrated circuitry incorporating resistors and diodes. A node to which electrical connection is to be made is provided. An electrically insulative layer is provided outwardly of the node. An opening is provided in the electrically insulative layer over the node. The opening is filled with semiconductive material which depending on configuration serves as one or both of a vertically elongated diode and resistor.
    Type: Grant
    Filed: June 28, 2000
    Date of Patent: July 23, 2002
    Assignee: Micron Technology, Inc.
    Inventors: J. Brett Rolfson, Monte Manning
  • Patent number: 6417559
    Abstract: In one aspect, the invention includes a semiconductor processing method, comprising: a) providing a silicon nitride material having a surface; b) forming a barrier layer over the surface of the material, the barrier layer comprising silicon and nitrogen; and c) forming a photoresist over and against the barrier layer.
    Type: Grant
    Filed: November 27, 2000
    Date of Patent: July 9, 2002
    Assignee: Micron Technology, Inc.
    Inventors: John T. Moore, Scott Jeffrey DeBoer, Mark Fischer, J. Brett Rolfson, Annette L. Martin, Ardavan Niroomand
  • Patent number: 6417928
    Abstract: Disclosed is a process for analyzing the surface characteristics of opaque materials. The method comprises in one embodiment the use of a UV reflectometer to build a calibration matrix of data from a set of control samples and correlating a desired surface characteristic such as roughness or surface area to the set of reflectances of the control samples. The UV reflectometer is then used to measure the reflectances of a test sample of unknown surface characteristics. Reflectances are taken at a variety of angles of reflection for a variety of wavelengths, preferably between about 250 nanometers to about 400 nanometers. These reflectances are then compared against the reflectances of the calibration matrix in order to correlate the closest data in the calibration matrix. By so doing, a variety of information is thereby concluded, due to the broad spectrum of wavelengths and angles of reflection used.
    Type: Grant
    Filed: February 26, 2001
    Date of Patent: July 9, 2002
    Assignee: Micron Technology, Inc.
    Inventors: Randhir P. S. Thakur, Michael Nuttall, J. Brett Rolfson, Robert James Burke
  • Publication number: 20020076870
    Abstract: Disclosed is an improved CMOS fabrication method that allows an implanted well in a bare silicon wafer to be simultaneously, driven annealed and denuded in a single process step. More specifically, a single step drive-anneal-denude (DAD) process is accomplished using a non-inert ambient environment. The DAD process is accomplished in a combination argon/hydrogen ambient environment. This process causes the silicon wafer to roughen slightly and is followed by an oxidation step, that optionally takes place in a combination argon/oxygen ambient environment to smooth out the silicon surface. The oxidation step may also optionally act as a pad-oxide or screening oxide for subsequent fabrication.
    Type: Application
    Filed: November 21, 2001
    Publication date: June 20, 2002
    Inventors: J. Brett Rolfson, Tyler A. Lowrey, Fernando Gonzalez, W. Richard Barbour
  • Publication number: 20020067489
    Abstract: Disclosed is a process for analyzing the surface characteristics of opaque materials. The method comprises in one embodiment the use of a UV reflectometer to build a calibration matrix of data from a set of control samples and correlating a desired surface characteristic such as roughness or surface area to the set of reflectances of the control samples. The UV reflectometer is then used to measure the reflectances of a test sample of unknown surface characteristics. Reflectances are taken at a variety of angles of reflection for a variety of wavelengths, preferably between about 250 nanometers to about 400 nanometers. These reflectances are then compared against the reflectances of the calibration matrix in order to correlate the closest data in the calibration matrix. By so doing, a variety of information is thereby concluded, due to the broad spectrum of wavelengths and angles of reflection used.
    Type: Application
    Filed: October 29, 2001
    Publication date: June 6, 2002
    Applicant: Micron Technology, Inc.
    Inventors: Randhir P.S. Thakur, Michael Nuttall, J. Brett Rolfson, Robert James Burke
  • Patent number: 6395432
    Abstract: In but one implementation in the fabrication of a phase shift mask, both process alignment in the formation of a phase shift alignment region and degree of phase shift of the phase shift alignment region is determined at least in part by using aerial image measurement equipment. In one implementation, aerial image measurement equipment is used to both determine phase shift of a phase shift alignment region at least in part by capturing a series of aerial images as a function of focus and to determine process alignment in the formation of the phase shift alignment region at least in part by measuring distance between spaced low intensity locations defined by an edge of the phase shift alignment region and an adjacent alignment feature edge.
    Type: Grant
    Filed: August 2, 1999
    Date of Patent: May 28, 2002
    Assignee: Micron Technology, Inc.
    Inventor: J. Brett Rolfson
  • Patent number: 6391734
    Abstract: Disclosed are methods of forming resistors and diodes from semiconductive material, and static random access memory (SRAM) cells incorporating resistors, and to integrated circuitry incorporating resistors and diodes. A node to which electrical connection is to be made is provided. An electrically insulative layer is provided outwardly of the node. An opening is provided in the electrically insulative layer over the node. The opening is filled with semiconductive material which depending on configuration serves as one or both of a vertically elongated diode and resistor.
    Type: Grant
    Filed: December 22, 1999
    Date of Patent: May 21, 2002
    Assignee: Micron Technology, Inc.
    Inventors: J. Brett Rolfson, Monte Manning
  • Patent number: 6380100
    Abstract: In one aspect, the invention encompasses an apparatus for semiconductor processing comprising: a) at least one support member comprising an upper surface for supporting a semiconductor wafer; b) a component through which the support member extends, the component comprising a front surface and a back surface, at least one of the support member and the component being movable relative to the other of the support member and the component such that the support member can support a wafer in an elevated position above the front surface and can be withdrawn into the component to lower the wafer relative to the front surface of the component; and c) a block joined to the support member below the component back surface, the block engaging the component back surface when the support member upper surface extends above the component to a predetermined distance, the block preventing the support member upper surface from extending beyond the front surface by more than the predetermined distance.
    Type: Grant
    Filed: May 15, 2001
    Date of Patent: April 30, 2002
    Assignee: Micron Technology, Inc.
    Inventors: J. Brett Rolfson, Rodney C. Langley
  • Publication number: 20020047202
    Abstract: In one aspect, the invention includes a semiconductor processing method, comprising: a) providing a silicon nitride material having a surface; b) forming a barrier layer over the surface of the material, the barrier layer comprising silicon and nitrogen; and c) forming a photoresist over and against the barrier layer.
    Type: Application
    Filed: November 26, 2001
    Publication date: April 25, 2002
    Inventors: John T. Moore, Scott Jeffrey DeBoer, Mark Fischer, J. Brett Rolfson, Annette L. Martin, Ardavan Niroomand
  • Patent number: 6352647
    Abstract: Methods of making hardmask assemblies or other layered structures, and other masks, include providing an annular seal member between a first surface of layered structure, preferably a hardmask assembly, and a first clamp element, the hardmask assembly comprising at least a hardmask layer; and applying a force between the first clamp element and a second clamp element to hold the hardmask assembly between the annular seal member and the second clamp element. In addition, there are provided methods further comprising etching the first surface of the hardmask assembly within the bounds of an interior space defined by the annular seal member. Methods further comprise etching the substrate layer through the hardmask layer and/or removing the hardmask layer after etching the substrate layer.
    Type: Grant
    Filed: May 5, 1999
    Date of Patent: March 5, 2002
    Assignee: Micron Technology, Inc.
    Inventor: J. Brett Rolfson
  • Patent number: 6342435
    Abstract: Disclosed is an improved CMOS fabrication method that allows an implanted well in a bare silicon wafer to be simultaneously, driven annealed and denuded in a single process step. More specifically, a single step drive-anneal-denude (DAD) process is accomplished using a non-inert ambient environment. The DAD process is accomplished in a combination argon/hydrogen ambient environment. This process causes the silicon wafer to roughen slightly and is followed by an oxidation step, that optionally takes place in a combination argon/oxygen ambient environment to smooth out the silicon surface. The oxidation step may also optionally act as a pad-oxide or screening oxide for subsequent fabrication.
    Type: Grant
    Filed: November 17, 1999
    Date of Patent: January 29, 2002
    Assignee: Micron Technology, Inc.
    Inventors: J. Brett Rolfson, Tyler A. Lowrey, Fernando Gonzalez, W. Richard Barbour
  • Patent number: 6340834
    Abstract: Disclosed are methods of forming resistors and diodes from semiconductive material, and static random access memory (SRAM) cells incorporating resistors, and to integrated circuitry incorporating resistors and diodes. A node to which electrical connection is to be made is provided. An electrically insulative layer is provided outwardly of the node. An opening is provided in the electrically insulative layer over the node. The opening is filled with semiconductive material which depending on configuration serves as one or both of a vertically elongated diode and resistor.
    Type: Grant
    Filed: June 29, 1998
    Date of Patent: January 22, 2002
    Assignee: Micron Technology, Inc.
    Inventors: J. Brett Rolfson, Monte Manning
  • Patent number: 6340835
    Abstract: Disclosed are methods of forming resistors and diodes from semiconductive material, and static random access memory (SRAM) cells incorporating resistors, and to integrated circuitry incorporating resistors and diodes. A node to which electrical connection is to be made is provided. An electrically insulative layer is provided outwardly of the node. An opening is provided in the electrically insulative layer over the node. The opening is filled with semiconductive material which depending on configuration serves as one or both of a vertically elongated diode and resistor.
    Type: Grant
    Filed: October 7, 1999
    Date of Patent: January 22, 2002
    Assignee: Micron Technology, Inc.
    Inventors: J. Brett Rolfson, Monte Manning