Patent ID: 6180524
Filing Date: 2001-01-30
Classification: C23C,C25D,H01L

Abstract:
A method for controllable deposit of a metal on a surface of an object, the method comprising:rinsing an exposed surface of a selected workpiece in a solution in an oxygen-free solution including liquid ammonia and draining the solution;using electroless deposition to provide a seed thickness of a selected metal, of a first selected thickness no more than about 0.1 .mu.m, on the workpiece exposed surface of a selected workpiece, where the metal is selected from a group of metals consisting of Cu, Ag, Au, Ni, Pd, Pt, Fe, Co, Zn and Cd;contacting the workpiece exposed surface in an electroplating solution including the selected metal and liquid ammonia;causing the selected metal in the electroplating solution to deposit on the workpiece exposed surface at a selected rate; andwhen a second selected thickness of the selected metal has been deposited on the workpiece exposed surface, removing the remaining electroplating solution and rinsing the workpiece exposed surface in liquid ammonia.