Patent ID: 7811884
Filing Date: 2010-10-12
Classification: G11C,H01L

Abstract:
1. A method for manufacturing a nonvolatile semiconductor memory device comprising: irradiating a single crystal semiconductor substrate with at least one of hydrogen and rare gas ions to form a single crystal semiconductor layer and a separation layer under the single crystal semiconductor layer, wherein the separation layer is formed at a certain depth from a surface of the single crystal semiconductor substrate; selectively etching the single crystal semiconductor layer and the separation layer to form a groove in the single crystal semiconductor substrate so as to divide the single crystal semiconductor layer into a first single crystal semiconductor layer and a second single crystal semiconductor layer; bonding a base substrate having an insulating surface and the first single crystal semiconductor layer with each other; separating the first single crystal semiconductor layer from the single crystal semiconductor substrate so as to leave the first single crystal semiconductor layer over the insulating surface of the base substrate; selectively etching the first single crystal semiconductor layer to divide into a third single crystal semiconductor layer and a fourth single crystal semiconductor layer; forming a charge accumulation layer over the third single crystal semiconductor layer with a first insulating film interposed therebetween, wherein the charge accumulation layer covers a top face and part of side faces of the third single crystal semiconductor layer with the first insulating film interposed therebetween, and forming a control gate electrode layer over the floating gate and a gate electrode layer over the fourth single crystal semiconductor layer, respectively with a second insulating film interposed therebetween.