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Title: Fabricating solar cells with silicon nanoparticles

A laser contact process is employed to form contact holes to emitters of a solar cell. Doped silicon nanoparticles are formed over a substrate of the solar cell. The surface of individual or clusters of silicon nanoparticles is coated with a nanoparticle passivation film. Contact holes to emitters of the solar cell are formed by impinging a laser beam on the passivated silicon nanoparticles. For example, the laser contact process may be a laser ablation process. In that case, the emitters may be formed by diffusing dopants from the silicon nanoparticles prior to forming the contact holes to the emitters. As another example, the laser contact process may be a laser melting process whereby portions of the silicon nanoparticles are melted to form the emitters and contact holes to the emitters.
Inventors:
; ;
Issue Date:
OSTI Identifier:
1154931
Assignee:
SunPower Corporation (San Jose, CA) GFO
Patent Number(s):
8,822,262
Application Number:
13/335,550
Contract Number:
FC36-07GO17043
Research Org:
SunPower Corporation, San Jose, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY

Other works cited in this record:

Method of fabricating back surface point contact solar cells
patent, May 1990

Radiation resistant passivation of silicon solar cells
patent, July 1991

Bilevel contact solar cells
patent, October 1991

Method of fabricating polysilicon emitters for solar cells
patent, October 1991

Trench process and structure for backside contact solar cells with polysilicon doped regions
patent, October 2010

Trench process and structure for backside contact solar cells with polysilicon doped regions
patent, December 2010

Method for the Contact Separation of Electrically-Conducting Layers on the Back Contacts of Solar Cells and Corresponding Solar Cells
patent-application, February 2008

Solar cell structures, photovoltaic panels and corresponding processes
patent-application, August 2008

Front contact solar cell with formed emitter
patent-application, August 2009

The promise of concentrators
journal, January 2000

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