Resumes
Resumes
Mulugeta Wudu Phones & Addresses
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5790 Santa Teresa Blvd, San Jose, CA 95123 (408) 226-7105
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Sanger, CA
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5790 Santa Teresa Blvd #58, San Jose, CA 95123
Work
Position:
Sales Occupations
Education
Degree:
Associate degree or higher
Publications
Us Patents
Laser Polishing Of A Solar Cell Substrate
View pageUS Patent:
8536054, Sep 17, 2013
Filed:
Jun 22, 2010
Appl. No.:
12/820455
Inventors:
Dallas W. Meyer - Prior Lake MN, US
Jason Stephen Corneille - San Jose CA, US
Steven Thomas Croft - Menlo Park CA, US
Mulugeta Zerfu Wudu - San Jose CA, US
William James McColl - Palo Alto CA, US
Jason Stephen Corneille - San Jose CA, US
Steven Thomas Croft - Menlo Park CA, US
Mulugeta Zerfu Wudu - San Jose CA, US
William James McColl - Palo Alto CA, US
Assignee:
MIASOLE - Santa Clara CA
International Classification:
H01L 21/00
B23K 26/00
B23K 26/00
US Classification:
438662, 438 71, 438665, 21912166
Abstract:
Provided herein are methods of polishing and texturing surfaces thin-film photovoltaic cell substrates. The methods involve laser irradiation of a surface having a high frequency roughness in an area of 5-200 microns to form a shallow and rapidly expanding melt pool, followed by rapid cooling of the material surface. The minimization of surface tension causes the surface to re-solidify in a locally smooth surface. the high frequency roughness drops over the surface with a lower frequency bump or texture pattern remaining from the re-solidification.
Laser Polishing Of A Back Contact Of A Solar Cell
View pageUS Patent:
8546172, Oct 1, 2013
Filed:
Jun 22, 2010
Appl. No.:
12/820489
Inventors:
Dallas W. Meyer - Prior Lake MN, US
Jason Stephen Corneille - San Jose CA, US
Steven Thomas Croft - Menlo Park CA, US
Mulugeta Zerfu Wudu - San Jose CA, US
William James McColl - Palo Alto CA, US
Jason Stephen Corneille - San Jose CA, US
Steven Thomas Croft - Menlo Park CA, US
Mulugeta Zerfu Wudu - San Jose CA, US
William James McColl - Palo Alto CA, US
Assignee:
Miasole - Santa Clara CA
International Classification:
H01L 21/02
US Classification:
438 59, 438 62, 257E31027
Abstract:
Provided herein are methods of polishing, cleaning and texturing back contacts of thin-film solar cells. According to various embodiments, the methods involve irradiating sites on the back contact with laser beams to remove contaminants and/or smooth the surface of the back contact. The back contact, e. g. , a molybdenum, copper, or niobium thin-film, is smoothed prior to deposition of the absorber and other thin-films of the photovoltaic stack. In certain embodiments, laser polishing of the back contact is used to enhance the diffusion barrier characteristics of the back contact layer, with all or a surface layer of the back contact becoming essentially amorphous. In certain embodiments, the adhesion of the absorber layer is enhanced by the textured back contact and by the presence of the amorphous metal at the deposition surface.
Sodium-Incorporation In Solar Cell Substrates And Contacts
View pageUS Patent:
8586398, Nov 19, 2013
Filed:
Jun 22, 2010
Appl. No.:
12/820560
Inventors:
Dallas W. Meyer - Prior Lake MN, US
Jason Stephen Corneille - San Jose CA, US
Steven Thomas Croft - Menlo Park CA, US
Mulugeta Zerfu Wudu - San Jose CA, US
William James McColl - Palo Alto CA, US
Jason Stephen Corneille - San Jose CA, US
Steven Thomas Croft - Menlo Park CA, US
Mulugeta Zerfu Wudu - San Jose CA, US
William James McColl - Palo Alto CA, US
Assignee:
Miasole - Santa Clara CA
International Classification:
H01L 21/02
US Classification:
438 59, 438 62, 438 89, 257E31027
Abstract:
Provided herein are methods of incorporating additives into thin-film solar cell substrates and back contacts. In certain embodiments, sodium is incorporated into a substrate or a back contact of a thin-film photovoltaic stack where it can diffuse into a CIGS or other absorber layer to improve efficiency and/or growth of the layer. The methods involve laser treating the substrate or back contact in the presence of a sodium (or sodium-containing) solid or vapor to thereby incorporate sodium into the surface of the substrate or back contact. In certain embodiments, the surface is simultaneously smoothed.
Smoothing A Metallic Substrate For A Solar Cell
View pageUS Patent:
20090229666, Sep 17, 2009
Filed:
Mar 14, 2008
Appl. No.:
12/049159
Inventors:
Jason Stephan Corneille - San Jose CA, US
Steven Thomas Croft - Menlo Park CA, US
Mulugeta Zerfu Wudu - San Jose CA, US
William James McColl - Palo Alto CA, US
Steven Thomas Croft - Menlo Park CA, US
Mulugeta Zerfu Wudu - San Jose CA, US
William James McColl - Palo Alto CA, US
International Classification:
H01L 31/032
H01L 31/04
B05D 5/00
H01L 31/04
B05D 5/00
US Classification:
136262, 427532, 427554, 136252
Abstract:
A method for smoothing the surface of a metallic substrate. The method includes providing a metallic substrate and smoothing a surface of the metallic substrate by irradiating the surface with a high-intensity energy source, such that the surface is smoothed to remove defects from the surface by creating an altered surface layer. The altered surface layer is configured to receive at least one layer in a fabrication process of an electronic device.
Interconnect Assembly
View pageUS Patent:
20090235979, Sep 24, 2009
Filed:
Mar 20, 2008
Appl. No.:
12/052476
Inventors:
Mulugeta Zerfu Wudu - San Jose CA, US
Jason Stephan Corneille - San Jose CA, US
Steven Thomas Croft - Menlo Park CA, US
Steven Douglas Flanders - San Jose CA, US
William James McColl - Palo Alto CA, US
Jason Stephan Corneille - San Jose CA, US
Steven Thomas Croft - Menlo Park CA, US
Steven Douglas Flanders - San Jose CA, US
William James McColl - Palo Alto CA, US
International Classification:
H01L 31/05
H01L 31/18
H01L 31/18
US Classification:
136256, 136244, 29825
Abstract:
An interconnect assembly. The interconnect assembly includes a trace that includes a plurality of electrically conductive portions. The plurality of electrically conductive portions is configured both to collect current from a first solar cell and to interconnect electrically to a second solar cell. In addition, the plurality of electrically conductive portions is configured such that solar-cell efficiency is substantially undiminished in an event that any one of the plurality of electrically conductive portions is conductively impaired.
Interconnect Assembly
View pageUS Patent:
20100043863, Feb 25, 2010
Filed:
Sep 24, 2009
Appl. No.:
12/566555
Inventors:
Mulugeta Zerfu Wudu - San Jose CA, US
Jason Stephen Corneille - San Jose CA, US
Steven Thomas Croft - Menlo Park CA, US
Steven Douglas Flanders - San Jose CA, US
William James McColl - Palo Alto CA, US
Jason Stephen Corneille - San Jose CA, US
Steven Thomas Croft - Menlo Park CA, US
Steven Douglas Flanders - San Jose CA, US
William James McColl - Palo Alto CA, US
Assignee:
MIASOLE - Santa Clara CA
International Classification:
H01L 31/042
H01L 31/00
H01B 5/00
H01L 31/00
H01B 5/00
US Classification:
136244, 136256, 1741261
Abstract:
An interconnect assembly. The interconnect assembly includes a trace that includes a plurality of electrically conductive portions. The plurality of electrically conductive portions is configured both to collect current from a first solar cell and to interconnect electrically to a second solar cell. In addition, the plurality of electrically conductive portions is configured such that solar-cell efficiency is substantially undiminished in an event that any one of the plurality of electrically conductive portions is conductively impaired.
Textured Substrate For Thin-Film Solar Cell
View pageUS Patent:
20100258185, Oct 14, 2010
Filed:
Jun 22, 2010
Appl. No.:
12/820522
Inventors:
Dallas W. Meyer - Prior Lake MN, US
Jason Stephen Corneille - San Jose CA, US
Steven Thomas Croft - Menlo Park CA, US
Mulugeta Zerfu Wudu - San Jose CA, US
William James McColl - Palo Alto CA, US
Jason Stephen Corneille - San Jose CA, US
Steven Thomas Croft - Menlo Park CA, US
Mulugeta Zerfu Wudu - San Jose CA, US
William James McColl - Palo Alto CA, US
Assignee:
MIASOLE - Santa Clara CA
International Classification:
H01L 31/0236
US Classification:
136256
Abstract:
Provided herein are textured substrates for thin-film solar cells. According to various embodiments, the textured substrates are characterized by substrate patterns exhibiting low-frequency roughness or flatness and long range order. The substrates may be metallic or non-metallic substrates, and in certain embodiments are stainless steel foils. According to various embodiments, the substrates may be provided in the form of a web, ready for deposition of thin-film photovoltaic stacks. Also provided are textured back contact thin films.
Method Of Texturing A Landing Zone
View pageUS Patent:
59422793, Aug 24, 1999
Filed:
Apr 2, 1997
Appl. No.:
8/832024
Inventors:
Mulugeta Zerfu Wudu - San Jose CA
Assignee:
Western Digital Corporation - Irvine CA
International Classification:
B05D 512
US Classification:
427127
Abstract:
A method and apparatus for texturing a landing zone on a substrate of a magnetic disk to reduce stiction between a magnetic transducer head and the disk is provided. The method includes projecting discrete pressurized fluid droplets to impact a substrate surface of the substrate with sufficient momentum to form cavities in a selected annular area of the substrate surface, the selected annular area with cavities therein being of sufficient width to provide a textured landing zone for the magnetic transducer head. A magnetic disk for storing data readable by a transducer head is also provided. The disk includes a rigid substrate. A textured landing zone is provided on the disk for engaging the transducer head. The textured landing zone is formed by the steps of directing a stream of discrete pressurized fluid droplets against the substrate to create roughness therein and moving the substrate and stream of droplets relative to one another in order to create an annular area of roughness. An underlayer is deposited over the substrate with the underlayer substantially replicating a surface topography of the substrate.