Patent ID: 6287891
Filing Date: 2001-09-11
Classification: H01L,H05K,Y10S

Abstract:
A method for transferring layers containing semiconductor devices and/or circuits to new substrates, comprising the steps of:(a) fabricating semiconducting devices and/or circuits on a sheet transfer layer, said sheet transfer layer being located on top of a seed substrate;(b) applying a layer of photoresist on top of said semiconducting devices and/or circuits;(c) preparing a wax-coated surface of said layer of photoresist by coating said layer of photoresist with a layer of a wax;(d) coating a perforated structure having holes with a layer of said wax;(e) attaching said perforated structure to said wax-coated surface of the layer of photoresist;(f) removing said seed substrate by etching;(g) applying an adhesive to an exposed surface of said sheet transfer layer;(h) attaching a new permanent substrate to a surface of said adhesive;(i) removing said wax by applying a solvent through said holes in said perforated structure; and(j) removing said perforated structure.