The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 28, 2015
Filed:
Apr. 12, 2013
Applicant:
Btu International, Inc., No. Billerica, MA (US);
Inventors:
Paul J. Richter, Chelmsford, MA (US);
Frank Bottari, Acton, MA (US);
Assignee:
BTU International, Inc., No. Billerica, MA (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L 21/38 (2006.01); H01L 21/22 (2006.01); H01L 31/18 (2006.01); H01L 21/225 (2006.01);
U.S. Cl.
CPC ...
H01L 31/18 (2013.01); H01L 21/2255 (2013.01);
Abstract
A method is provided for the simultaneous diffusion of dopants of different types on respective sides of a solar cell wafer in a single stage process. The dopants are applied to respective sides of the wafer in wet chemical form preferably by pad printing. The doping materials can be applied to the entire wafer surface or effective area thereof, or can be applied in a pattern to suit the intended solar cell configuration. In a typical embodiment, the dopants are boron and phosphorus.