Patent ID: 7939388
Filing Date: 2011-05-10
Classification: C23C,H01J,H01L

Abstract:
1. A plasma doping method, in which a substrate is placed in a vacuum chamber to form an impurity-doped layer therein, the method comprising: a step (a) of generating, in the vacuum chamber, a first plasma of a first gas containing an element belonging to the same group in the periodic table as a primary element of the substrate; a step (b), after the step (a), of placing the substrate on a sample stage, which is provided in the vacuum chamber and functions as an electrode; a step (c), after the step (b), of generating a second plasma of a second gas containing an impurity in the vacuum chamber and supplying a power to the sample stage as the electrode to thereby introduce the impurity into the substrate, thus forming the impurity-doped layer; and before the step (a), a step (d) of generating a third plasma of a third gas containing F (fluorine) in the vacuum chamber, wherein the step (d) is performed once for a plurality of iterations of the step (b) and the step (c).