Patent ID: 7986042
Filing Date: 2011-07-26
Classification: H01L

Abstract:
1. A semiconductor device comprising: a first single crystal silicon layer comprising first transistors, first alignment marks, and at least one metal layer overlying said first single crystal silicon layer, wherein said at least one metal layer comprises copper or aluminum more than other materials; a second single crystal silicon layer overlying said at least one metal layer, wherein said second single crystal silicon layer comprises: through vias through said second single crystal silicon layer; and a plurality of second transistors arranged in substantially parallel bands wherein each of a plurality of the bands comprises a portion of said second transistors along an axis in a repeating pattern; and connection paths between a portion of said first transistors and second transistors, wherein each of said connection paths comprises a first metal strip substantially parallel to said axis, and a second metal strip substantially perpendicular to said axis, wherein said first metal strip is on top of said second single crystal silicon layer, wherein said second metal strip is underneath said second single crystal silicon layer, and wherein said first metal strip and said second metal strip provide or are capable of providing a contact area through one of said through vias.