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:
May. 15, 2007
Filed:
May. 27, 2003
Wladyslaw Walukiewicz, Kensington, CA (US);
Kin Man Yu, Lafayette, CA (US);
Junqiao Wu, Richmond, CA (US);
William J. Schaff, Ithaca, NY (US);
Wladyslaw Walukiewicz, Kensington, CA (US);
Kin Man Yu, Lafayette, CA (US);
Junqiao Wu, Richmond, CA (US);
William J. Schaff, Ithaca, NY (US);
Cornell Research Foundation, Inc., Ithaca, NY (US);
The Regents of the University of California, Oakland, CA (US);
Abstract
An alloy having a large band gap range is used in a multijunction solar cell to enhance utilization of the solar energy spectrum. In one embodiment, the alloy is InGaN having an energy bandgap range of approximately 0.7 eV to 3.4 eV, providing a good match to the solar energy spectrum. Multiple junctions having different bandgaps are stacked to form a solar cell. Each junction may have different bandgaps (realized by varying the alloy composition), and therefore be responsive to different parts of the spectrum. The junctions are stacked in such a manner that some bands of light pass through upper junctions to lower junctions that are responsive to such bands.