Patent ID: 7867872
Filing Date: 2011-01-11
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device, comprising the steps of: defining a groove in a semiconductor substrate, the groove including an upper portion and a lower portion; forming a sacrificial layer to selectively fill the lower portion of the groove, wherein the sacrificial layer has an amorphous phase; implanting impurity ions into the semiconductor substrate while the lower portion of the groove is filled with the sacrificial layer such that a channel ion implantation layer is formed on the surface of the lower portion of the groove; removing the sacrificial layer; and forming a gate on the semiconductor substrate to fill the groove from which the sacrificial layer is removed; wherein the implanting is implemented such that the implanted impurity ions are dispersed in every direction at portions of the semiconductor substrate while the lower portion of the groove is filled with the sacrificial layer, and the impurity ions can be doped at a uniform concentration on the surface of the lower portion of the groove.