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:
Jan. 10, 2012
Filed:
Mar. 11, 2009
Hacene Lahreche, Paris, FR;
Hacene Lahreche, Paris, FR;
S.O.I.Tec Silicon on Insulator Technologies, Bernin, FR;
Abstract
The present invention relates to a method for manufacturing a crack free monocrystalline nitride layer having the composition AlGaN, where 0≦x≦0.3, on a substrate that is likely to generate tensile stress in the layer and to structures containing such layer and substrate. The method includes forming a nucleation layer on the substrate; forming a monocrystalline intermediate layer of aluminum or gallium nitride at a selected thickness on the nucleation layer; forming a monocrystalline seed layer of an AlBN compound in which the boron content is between 0 and 10% at a selected temperature and thickness on the intermediate layer with the thicknesses of the seed and intermediate layers being in a ratio of between 0.05 and 1; and forming the monocrystalline nitride layer of AlGaN nitride at a selected temperature on the seed layer, with the temperature of formation of the seed layer being 50 to 150° C. higher than the temperature of formation of the monocrystalline nitride layer in order to avoid producing cracks in the monocrystalline nitride layer.