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:
Oct. 12, 2010
Filed:
Apr. 09, 2009
Matthias Mueller, Jena, DE;
Markus Finkbeiner, Remchingen, DE;
Uwe Sahr, Nuremberg, DE;
Ingo Schwirtlich, Miltenberg, DE;
Michael Clauss, Hofheim, DE;
Matthias Mueller, Jena, DE;
Markus Finkbeiner, Remchingen, DE;
Uwe Sahr, Nuremberg, DE;
Ingo Schwirtlich, Miltenberg, DE;
Michael Clauss, Hofheim, DE;
Schott AG, Mainz, DE;
Abstract
The device for production of a monocrystalline or a multicrystalline material blank, especially a silicon multicrystalline blank, using the VGF method has a crucible with a rectangular or square cross section. A flat heating device, especially a jacket heater, which generates an inhomogeneous temperature profile, is arranged around the crucible. This temperature profile corresponds to the temperature gradient formed in the center of the crucible. The heat output of the flat heating device decreases from the top to the bottom end of the crucible. The flat heating device includes parallel heating webs, which extend in a meandering course. The heat outputs from the heating webs differ according to their different conductor cross sections. To avoid local overheating in corner areas of the crucible, constrictions of the cross sections of the heating webs are provided at inversion zones of their meandering course.