Patent ID: 6302965
Filing Date: 2001-10-16
Classification: C23C

Abstract:
A dispersion plate for applying vapors of materials useful in chemical vapor deposition of layers onto a surface of a semiconductor body, the dispersion plate comprising:a body having a center axis, an outer diameter, an input face, an output face, and a thickness between the faces;an entrance along the center axis in the input face for receiving a stream of vaporized material;the plate defining a plurality of passages therethrough, each passage having a length and a diameter and extending radially from the center axis at respective inclined angles from the input face to the output face; andthe plate defining a hole therethrough having a diameter and extending along the center axis from the entrance in the input face to the output face, the hole and plurality of passages having sufficiently large diameters to result in a relatively low pressure drop to vapor flowing through them and to provide dispersion of vapor flowing through the plate such that vapor flows evenly onto the surface of the semiconductor body.