Patent ID: 9620412
Date: 2017-04-11
CPC Classifications: H01L

Claim:
1. A method for modifying a crystalline structure of a copper element with a planar surface, the method comprising: a) producing a copper standard having grains of a second size, the standard having a planar surface; b) reducing roughness of the planar surface of the copper standard and the planar surface of a copper element to a roughness of less than 1 nm RMS, said copper element having grains of a first size; c) cleaning the planar surfaces of said copper standard and of said copper element obtained from said b) reducing; d) contacting the cleaned planar surfaces of said copper standard and said copper element; and e) annealing the copper standard and the copper element after said d) contacting, thereby growing the size of the grains of the copper element until these grains reach the size of the grains of the copper standard, and thereby forming a monobloc of copper from the copper standard and the copper element with no bonding interface between the copper standard and the copper element, wherein said grains of a second size are greater in size than the grains of a first size.