Patent ID: 8288273
Filing Date: 2012-10-16
Classification: H01L

Abstract:
1. A method for forming a patterned thick metallization atop a surface insulation layer of a power semiconductor chip with a plurality of pre-patterned contact zones thereon, the method comprises: a) providing a nearly completely fabricated semiconductor chip wafer together with its built-in alignment mark ready for metallization; b) depositing a bottom metal layer, atop the wafer, of sub-thickness TK c) depositing a top metal layer, atop the bottom metal layer, of sub-thickness TK d) patterning, referencing the built-in alignment mark, the composite thick metallization whereby form a patterned thick metallization with the process advantages of: 1. Better metal step coverage owing to the superior metal step coverage of the hot metal process as compared to that of the cold metal process; and 2. Lower alignment error rate owing to the lower alignment signal noise of the cold metal process as compared to that of the hot metal process.