Patent ID: 8197599
Filing Date: 2012-06-12
Classification: C23C

Abstract:
1. A gas head, comprising: a base member including a first gas introduction port having a conical trapezoidal shape with increasing diameter towards a substrate surface for the introduction of a first gas formed in a center portion thereof and a plurality of second gas introduction ports for the introduction of a second gas formed around the first gas introduction port; and a dispersion board having a first portion and a second portion, the first portion supported by a sidewall of the chamber, the second portion extending parallel to the back surface of the base member, the second portion disposed opposite to the plurality of second gas introduction ports and spaced apart from the base member, the dispersion board having an opening in a region opposite to the first gas introduction port, whereby the dispersion board disperses the second gas introduced from the plurality of second gas introduction ports and allows passage of the first gas and the second gas from the opening, wherein the plurality of second gas introduction ports are disposed at equal distances and at equiangular intervals from the first gas introduction port; and a spacer interposed between the base member and the dispersion board for spacing therebetween, wherein the gas head is provided with a radical source for exciting the first gas.