Patent ID: 8912637
Filing Date: 2014-12-16
Classification: B82Y,H01L

Abstract:
1. A method of attaching a semiconductor die to a substrate, comprising the steps; providing a semiconductor wafer containing integrated circuits, wherein the wafer has a top side and a backside; printing an ink containing metal nanoparticles of the backside of the wafer; etching a plurality of cavities on the backside of the wafers using metal assisted etching to form a plurality of silicon nanowires; separating the semiconductor wafer into individual integrated circuit die; providing a substrate, having a top side with a die attach pad, and a backside; positioning the backside of integrated circuit die on the die attach pad while maintaining the top surface of the die in a parallel with the top surface of the substrate; and attaching the integrated circuit die to the substrate by the silicon nanowires using pressure between 0.01 and 1 Megapascal (MPa).