Patent ID: 6899762
Filing Date: 2005-05-31
Classification: B24B,H01L,Y10T

Abstract:
1. A process for producing a semiconductor wafer with a front surface and a back surface and an epitaxial layer of a semiconducting material deposited on the front surface, and said process comprising the following process steps: (a) as a single polishing step, simultaneous polishing of the front surface and of the back surface of the semiconductor wafer between rotating polishing plates while an alkaline polishing slurry is being supplied, the semiconductor wafer lying in a cutout of a carrier whose thickness is dimensioned to be 2 to 20 μm less than a thickness of the semiconductor wafer after the wafer has been polished; (b) simultaneously treating of the front surface and the back surface of the semiconductor wafer between rotating polishing plates while a liquid containing at least one polyhydric alcohol having 2 to 6 carbon atoms is being supplied; (c) cleaning and drying of the semiconductor wafer; and (d) depositing the epitaxia layer on the front surface of the semiconductor wafer produced in accordance with steps (a) to (c).