Patent ID: 6930030
Filing Date: 2005-08-16
Classification: H01L

Abstract:
1. A method for forming an electronic device based on a recess bottom formed in a crystalline silicon layer having a top surface and a bottom surface by precisely thinning of the crystalline silicon layer thereby forming a recess therein with a recess bottom and then forming the electronic device thereon by the steps as follows: forming a patterning mask with a window therethrough over the top surface of the crystalline silicon layer, performing the step of forming an amorphized region in the top surface of the crystalline silicon layer below the window reaching from the top surface of the crystalline silicon layer to a distance spaced substantially above the bottom surface of the crystalline silicon layer, selectively etching away the amorphized region in the top surface of the crystalline silicon layer to form a recess in the top surface of the crystalline silicon layer with the recess bottom spaced above the bottom surface of the crystalline silicon layer and stopping the etching when the recess bottom is spaced by the precise distance above the bottom surface of the crystalline silicon layer, removing the patterning mask, and forming the electronic device on the recess bottom.