Patents by Inventor Svetlana Radovanov

Svetlana Radovanov 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: 8604443
    Abstract: A system for manipulating an ion beam having a principal axis includes an upper member having a first and a second coil generally disposed in different regions of the upper member and configured to conduct, independently of each other, a first and a second current, respectively. A lower member includes a third and a fourth coil that are generally disposed opposite to respective first and second coils and are configured to conduct, independently of each other, a third and a fourth current, respectively. A lens gap is defined between the upper and lower members, and configured to transmit the ion beam, wherein the first through fourth currents produce a 45 degree quadrupole field that exerts a rotational force on the ion beam about its principal axis.
    Type: Grant
    Filed: November 11, 2010
    Date of Patent: December 10, 2013
    Assignee: Varian Semiconductor Equipment Associates, Inc.
    Inventors: Frank Sinclair, Victor M. Benveniste, Svetlana Radovanov, James S. Buff
  • Patent number: 8519353
    Abstract: A method of controlling deflection of a charged particle beam in an electrostatic lens includes establishing a symmetrical electrostatic lens configuration comprising a plurality of electrodes disposed at unadjusted positions that are symmetric with respect to the central ray trajectory with applied unadjusted voltages that create fields symmetric with respect to the central ray trajectory. A symmetric electric field is calculated corresponding to the set of unadjusted voltages. A plurality of lower electrodes is arranged at adjusted positions that are asymmetric with respect to the central ray trajectory. A set of adjusted voltages is obtained for the plurality of lower electrodes, wherein the set of adjusted voltages corresponds to a set of respective potentials of the symmetric electric field at respective adjusted asymmetric positions. The adjusted voltages are applied to the asymmetric lens configuration when the charged particle beam passes therethrough.
    Type: Grant
    Filed: December 29, 2010
    Date of Patent: August 27, 2013
    Assignee: Varian Semiconductor Equipment Associates, Inc.
    Inventors: Svetlana Radovanov, Peter L. Kellerman, Frank Sinclair, Robert C. Lindberg
  • Patent number: 8481960
    Abstract: A system and method are disclosed for controlling an ion beam. A deceleration lens is disclosed for use in an ion implanter. The lens may include a suppression electrode, first and second focus electrodes, and first and second shields. The shields may be positioned between upper and lower portions of the suppression electrode. The first and second shields are positioned between the first focus electrode and an end station of the ion implanter. Thus positioned, the first and second shields protect support surfaces of said first and second focus electrodes from deposition of back-streaming particles generated from said ion beam. In some embodiments, the first and second focus electrodes may be adjustable to enable the electrode surfaces to be adjusted with respect to a direction of the ion beam. By adjusting the angle of the focus electrodes, parallelism of the ion beam can be controlled. Other embodiments are described and claimed.
    Type: Grant
    Filed: June 23, 2011
    Date of Patent: July 9, 2013
    Assignee: Varian Semiconductor Equipment Associates, Inc.
    Inventors: Svetlana Radovanov, Jason Schaller, Richard White, Kevin Verrier, James Blanchette, Bon-Woong Koo, Eric Hermanson, Kevin Daniels
  • Patent number: 8466431
    Abstract: Techniques for improving extracted ion beam quality using high-transparency electrodes are disclosed. In one particular exemplary embodiment, the techniques may be realized as an apparatus for ion implantation. The apparatus may comprise an ion source for generating an ion beam, wherein the ion source comprises a faceplate with an aperture for the ion beam to travel therethrough. The apparatus may also comprise a set of extraction electrodes comprising at least a suppression electrode and a high-transparency ground electrode, wherein the set of extraction electrodes may extract the ion beam from the ion source via the faceplate, and wherein the high-transparency ground electrode may be configured to optimize gas conductance between the suppression electrode and the high-transparency ground electrode for improved extracted ion beam quality.
    Type: Grant
    Filed: February 12, 2009
    Date of Patent: June 18, 2013
    Assignee: Varian Semiconductor Equipment Associates, Inc.
    Inventors: James S. Buff, Svetlana Radovanov, Bon-Woong Koo, Wilhelm Platow, Frank Sinclair, D. Jeffrey Lischer, Craig R. Chaney, Steven Borichevsky, Eric R. Cobb, Mayur Jagtap, Kenneth H. Purser, Victor Benveniste, Shardul S. Patel
  • Patent number: 8357912
    Abstract: Techniques for providing a multimode ion source are disclosed. In one particular exemplary embodiment, the techniques may be realized as an apparatus for ion implantation, the apparatus including an ion source having a hot cathode and a high frequency plasma generator, wherein the ion source has multiple modes of operation.
    Type: Grant
    Filed: February 18, 2010
    Date of Patent: January 22, 2013
    Assignee: Varian Semiconductor Equipment Associates, Inc.
    Inventors: Svetlana Radovanov, Bon-Woong Koo, Frank Sinclair, Victor Benveniste
  • Publication number: 20130001414
    Abstract: A system for producing a mass analyzed ion beam for implanting into a workpiece, includes an extraction plate having a set of apertures having a longitudinal axis of the aperture. The set of apertures are configured to extract ions from an ion source to form a plurality of beamlets. The system also includes an analyzing magnet region configured to provide a magnetic field to deflect ions in the beamlets in a first direction that is generally perpendicular to the longitudinal axis of the apertures. The system further includes a mass analysis plate having a set of apertures configured to transmit first ion species having a first mass/charge ratio and to block second ion species having a second mass/charge ratio and a workpiece holder configured to move with respect to the mass analysis plate along the first direction.
    Type: Application
    Filed: July 1, 2011
    Publication date: January 3, 2013
    Applicant: VARIAN SEMICONDUCTOR EQUIPMENT ASSOCIATES, INC.
    Inventors: Victor M. Benveniste, Frank Sinclair, Svetlana Radovanov, Bon-Woong Koo
  • Publication number: 20120168637
    Abstract: A method of controlling deflection of a charged particle beam in an electrostatic lens includes establishing a symmetrical electrostatic lens configuration comprising a plurality of electrodes disposed at unadjusted positions that are symmetric with respect to the central ray trajectory with applied unadjusted voltages that create fields symmetric with respect to the central ray trajectory. A symmetric electric field is calculated corresponding to the set of unadjusted voltages. A plurality of lower electrodes is arranged at adjusted positions that are asymmetric with respect to the central ray trajectory. A set of adjusted voltages is obtained for the plurality of lower electrodes, wherein the set of adjusted voltages corresponds to a set of respective potentials of the symmetric electric field at respective adjusted asymmetric positions. The adjusted voltages are applied to the asymmetric lens configuration when the charged particle beam passes therethrough.
    Type: Application
    Filed: December 29, 2010
    Publication date: July 5, 2012
    Applicant: VARIAN SEMICONDUCTOR EQUIPMENT ASSOCIATES, INC.
    Inventors: Svetlana Radovanov, Peter L. Kellerman, Frank Sinclair, Robert C. Lindberg
  • Publication number: 20120168622
    Abstract: An implantation system includes an ion extraction plate having a set of apertures configured to extract ions from an ion source to form a plurality of beamlets. A magnetic analyzer is configured to provide a magnetic field to deflect ions in the beamlets in a first direction that is generally perpendicular to a principle axis of the beamlets. A mass analysis plate includes a set of apertures wherein first ion species having a first mass/charge ratio are transmitted through the mass analysis plate and second ion species having a second mass/charge ratio are blocked by the mass analysis plate. A workpiece holder is configured to move with respect to the mass analysis plate in a second direction perpendicular to the first direction, wherein a pattern of ions transmitted through the mass analysis plate forms a continuous ion beam current along the first direction at the substrate.
    Type: Application
    Filed: December 29, 2010
    Publication date: July 5, 2012
    Applicant: VARIAN SEMICONDUCTOR EQUIPMENT ASSOCIATES, INC.
    Inventors: Victor M. Benveniste, Frank Sinclair, Svetlana Radovanov, Bon-Woong Koo
  • Publication number: 20120145918
    Abstract: A plasma is formed from one or more gases in a plasma chamber using at least a first power and a second power. A first ion species is generated at said first power and a second ion species is generated at said second power. In one embodiment, the first ion species and second ion species are implanted into a workpiece at two different energies using at least a first bias voltage and a second bias voltage. This may enable implantation to two different depths. These on species may be atomic ions or molecular ions. The molecular ions may be larger than the gases used to form the plasma.
    Type: Application
    Filed: December 10, 2010
    Publication date: June 14, 2012
    Applicant: VARIAN SEMICONDUCTOR EQUIPMENT ASSOCIATES, INC.
    Inventors: Svetlana RADOVANOV, Ludovic GODET, Christopher R. HATEM
  • Publication number: 20120111834
    Abstract: A plasma processing apparatus includes a process chamber, a platen for supporting a workpiece, a source configured to generate a plasma in the process chamber, and an insulating modifier. The insulating modifier has a gap, and a gap plane, where the gap plane is defined by portions of the insulating modifier closest to the sheath and proximate the gap. A gap angle is defined as the angle between the gap plane and a plane defined by the front surface of the workpiece. Additionally, a method of having ions strike a workpiece is disclosed, where the range of incident angles of the ions striking the workpiece includes a center angle and an angular distribution, and where the use of the insulating modifier creates a center angle that is not perpendicular to the workpiece.
    Type: Application
    Filed: January 19, 2012
    Publication date: May 10, 2012
    Applicant: Varian Semiconductor Equipment Associates, Inc.
    Inventors: Ludovic Godet, Timothy Miller, Svetlana Radovanov, Anthony Renau, Vikram Singh
  • Patent number: 8101510
    Abstract: A plasma processing apparatus includes a process chamber, a platen positioned in the process chamber for supporting a workpiece, a source configured to generate a plasma in the process chamber having a plasma sheath adjacent to the front surface of the workpiece, and an insulating modifier. The insulating modifier has a gap, and a gap plane, where the gap plane is defined by portions of the insulating modifier closest to the sheath and proximate the gap. A gap angle is defined as the angle between the gap plane and a plane defined by the front surface of the workpiece. Additionally, a method of having ions strike a workpiece is disclosed, where the range of incident angles of the ions striking the workpiece includes a center angle and an angular distribution, and where the use of the insulating modifier creates a center angle that is not perpendicular to the workpiece.
    Type: Grant
    Filed: December 22, 2009
    Date of Patent: January 24, 2012
    Assignee: Varian Semiconductor Equipment Associates, Inc.
    Inventors: Ludovic Godet, Timothy Miller, Svetlana Radovanov, Anthony Renau, Vikram Singh
  • Publication number: 20120001087
    Abstract: A system and method are disclosed for controlling an ion beam. A deceleration lens is disclosed for use in an ion implanter. The lens may include a suppression electrode, first and second focus electrodes, and first and second shields. The shields may be positioned between upper and lower portions of the suppression electrode. The first and second shields are positioned between the first focus electrode and an end station of the ion implanter. Thus positioned, the first and second shields protect support surfaces of said first and second focus electrodes from deposition of back-streaming particles generated from said ion beam. In some embodiments, the first and second focus electrodes may be adjustable to enable the electrode surfaces to be adjusted with respect to a direction of the ion beam. By adjusting the angle of the focus electrodes, parallelism of the ion beam can be controlled. Other embodiments are described and claimed.
    Type: Application
    Filed: June 23, 2011
    Publication date: January 5, 2012
    Applicant: VARIAN SEMICONDUCTOR EQUIPMENT ASSOCIATES, INC.
    Inventors: Svetlana Radovanov, Jason Schaller, Richard M. White, Kevin R. Verrier, James Blanchette, Bon-Woong Koo, Eric d. Hermanson, Kevin Daniels
  • Publication number: 20110256732
    Abstract: A plasma processing method is provided. The plasma processing method includes using the after-glow of a pulsed power plasma to perform conformal processing. During the afterglow, the equipotential field lines follow the contour of the workpiece surface, allowing ions to be introduced in a variety of incident angles, especially to non-planar surfaces. In another aspect of the disclosure, the platen may be biased positively during the plasma afterglow to attract negative ions toward the workpiece. Various conformal processing steps, such as implantation, etching and deposition may be performed.
    Type: Application
    Filed: April 15, 2010
    Publication date: October 20, 2011
    Applicant: VARIAN SEMICONDUCTOR EQUIPMENT ASSOCIATES
    Inventors: Helen Maynard, Vikram Singh, Svetlana Radovanov, Harold Persing
  • Publication number: 20110253902
    Abstract: An apparatus that generates molecular ions and methods to generate molecular ions are disclosed. At least a first species is ionized in an ion source. The first species ions and/or first species combine to form molecular ions. These molecular ions may be transported to a second chamber, which may be an arc chamber or diffusion chamber, and are extracted. The molecular ions may have a larger atomic mass than the first species or first species ions. A second species also may be ionized with the first species to form molecular ions. In one instance, the first and second species are both molecules.
    Type: Application
    Filed: April 20, 2010
    Publication date: October 20, 2011
    Applicant: VARIAN SEMICONDUCTOR EQUIPMENT ASSOCIATES, INC.
    Inventors: Ludovic Godet, Svetlana Radovanov, Christopher R. Hatem
  • Publication number: 20110114849
    Abstract: A system for manipulating an ion beam having a principal axis includes an upper member having a first and a second coil generally disposed in different regions of the upper member and configured to conduct, independently of each other, a first and a second current, respectively. A lower member includes a third and a fourth coil that are generally disposed opposite to respective first and second coils and are configured to conduct, independently of each other, a third and a fourth current, respectively. A lens gap is defined between the upper and lower members, and configured to transmit the ion beam, wherein the first through fourth currents produce a 45 degree quadrupole field that exerts a rotational force on the ion beam about its principal axis.
    Type: Application
    Filed: November 11, 2010
    Publication date: May 19, 2011
    Applicant: VARIAN SEMICONDUCTOR EQUIPMENT ASSOCIATES , INC.
    Inventors: Frank Sinclair, Victor M. Benveniste, Svetlana Radovanov, James S. Buff
  • Patent number: 7888653
    Abstract: Techniques for independently controlling deflection, deceleration, and focus of an ion beam are disclosed. In one particular exemplary embodiment, the techniques may be realized as an apparatus for independently controlling deflection, deceleration, and focus of an ion beam. The apparatus may comprise an electrode configuration comprising a set of upper electrodes disposed above an ion beam and a set of lower electrodes disposed below the ion beam. The set of upper electrodes and the set of lower electrodes may be positioned symmetrically about a central ray trajectory of the ion beam. A difference in potentials between the set of upper electrodes and the set of lower electrodes may also be varied along the central ray trajectory to reflect an energy of the ion beam at each point along the central ray trajectory for independently controlling deflection, deceleration, and focus of an ion beam.
    Type: Grant
    Filed: January 2, 2009
    Date of Patent: February 15, 2011
    Assignee: Varian Semiconductor Equipment Associates, Inc.
    Inventors: Peter L. Kellerman, Svetlana Radovanov, Frank Sinclair, Victor M. Benveniste
  • Publication number: 20100255665
    Abstract: A plasma processing apparatus includes a process chamber, a platen positioned in the process chamber for supporting a workpiece, a source configured to generate a plasma in the process chamber having a plasma sheath adjacent to the front surface of the workpiece, and an insulating modifier. The insulating modifier has a gap, and a gap plane, where the gap plane is defined by portions of the insulating modifier closest to the sheath and proximate the gap. A gap angle is defined as the angle between the gap plane and a plane defined by the front surface of the workpiece. Additionally, a method of having ions strike a workpiece is disclosed, where the range of incident angles of the ions striking the workpiece includes a center angle and an angular distribution, and where the use of the insulating modifier creates a center angle that is not perpendicular to the workpiece.
    Type: Application
    Filed: December 22, 2009
    Publication date: October 7, 2010
    Inventors: Ludovic Godet, Timothy Miller, Svetlana Radovanov, Anthony Renau, Vikram Singh
  • Publication number: 20100200768
    Abstract: Techniques for improving extracted ion beam quality using high-transparency electrodes are disclosed. In one particular exemplary embodiment, the techniques may be realized as an apparatus for ion implantation. The apparatus may comprise an ion source for generating an ion beam, wherein the ion source comprises a faceplate with an aperture for the ion beam to travel therethrough. The apparatus may also comprise a set of extraction electrodes comprising at least a suppression electrode and a high-transparency ground electrode, wherein the set of extraction electrodes may extract the ion beam from the ion source via the faceplate, and wherein the high-transparency ground electrode may be configured to optimize gas conductance between the suppression electrode and the high-transparency ground electrode for improved extracted ion beam quality.
    Type: Application
    Filed: February 12, 2009
    Publication date: August 12, 2010
    Applicant: VARIAN SEMICONDUCTOR EQUIPMENT ASSOCIATES, INC.
    Inventors: JAMES BUFF, SVETLANA RADOVANOV, BON-WOONG KOO, WILHELM PLATOW, FRANK SINCLAIR, JEFFREY D. LISCHER, CRAIG CHANEY, STEVEN BORICHEVSKY, ERIC R. COBB, MAYUR JAGTAP, KENNETH PURSER, VICTOR M. BENVENISTE, SHARDUL S. PATEL
  • Patent number: 7767977
    Abstract: An ion source includes an arc chamber having an extraction aperture, and a plasma sheath modulator. The plasma sheath modulator is configured to control a shape of a boundary between plasma and a plasma sheath proximate the extraction aperture. The plasma sheath modulator may include a pair of insulators positioned in the arc chamber and spaced apart by a gap positioned proximate the extraction aperture. A well focused ion beam having a high current density can be generated by the ion source. A high current density ion beam can improve the throughput of an associated process. The emittance of the ion beam can also be controlled.
    Type: Grant
    Filed: April 3, 2009
    Date of Patent: August 3, 2010
    Assignee: Varian Semiconductor Equipment Associates, Inc.
    Inventors: Ludovic Godet, Svetlana Radovanov, Timothy J. Miller
  • Publication number: 20100171042
    Abstract: Techniques for independently controlling deflection, deceleration, and focus of an ion beam are disclosed. In one particular exemplary embodiment, the techniques may be realized as an apparatus for independently controlling deflection, deceleration, and focus of an ion beam. The apparatus may comprise an electrode configuration comprising a set of upper electrodes disposed above an ion beam and a set of lower electrodes disposed below the ion beam. The set of upper electrodes and the set of lower electrodes may be positioned symmetrically about a central ray trajectory of the ion beam. A difference in potentials between the set of upper electrodes and the set of lower electrodes may also be varied along the central ray trajectory to reflect an energy of the ion beam at each point along the central ray trajectory for independently controlling deflection, deceleration, and focus of an ion beam.
    Type: Application
    Filed: January 2, 2009
    Publication date: July 8, 2010
    Applicant: Varian Semiconductor Equipment Associates, Inc.
    Inventors: Peter L. KELLERMAN, Svetlana Radovanov, Frank Sinclair, Victor M. Benveniste