Patent ID: 8956473
Filing Date: 2015-02-17
Classification: B23K,C25D,H01L

Abstract:
1. A method for manufacturing Ni/In/Sn/Cu multilayer structure, comprising the steps of: (1) sequentially electroplating a first nickel layer and an indium layer on a first substrate; (2) forming a second nickel layer on a second substrate by way of sputtering deposition, and then forming a photoresist layer having a specific pattern on the second nickel layer through photolithography; (3) sequentially electroplating a copper layer and a tin layer on the second substrate and the photoresist layer; (4) removing the photoresist layer for forming a plurality copper posts on the second substrate; (5) stacking the first substrate onto the second substrate, so as to make the indium layer on the surface of the first substrate tightly contact with the copper posts on the second substrate; (6) applying a load to the first substrate or the second substrate, and then executing a reflow bonding process to the first substrate and the second substrate under a specific reflow temperature for a specific reflow time; and (7) baking the product of step (6), and then processing an aging heat treatment to the product under a specific heat-treatment temperature for a specific heat-treatment time, so as to form a multilayer structure having a plurality of intermetallic layers.