Patent ID: 7740706

Claim:
A gas distributor for use in a semiconductor processing chamber, the gas distributor comprising: a body including: a proximal portion including a threaded section having a first diameter, the proximal portion configured to couple the body to a wall of the semiconductor processing chamber; a concave surface extending from an upper boundary to a lower boundary of the concave surface, the concave surface extending along an arc having a first radius; a shoulder extending radially outward from the proximal portion to the upper boundary of the concave surface; a gas distributor face including a central flat portion and a recessed peripheral flat portion separated from the central flat portion by a step, wherein the central flat portion extends radially from a center of the gas distributor face to the step and has a second diameter greater than the first diameter; and a flange disposed between the concave surface and the gas distributor face, the flange extending radially outward from the lower boundary of the concave surface to an outer edge of the body, wherein the concave surface and a portion of the flange form a gas deflection surface extending from the upper boundary of the concave surface and arranged to divert a flow of a gas from a first direction to a second direction, the concave surface comprising at least about 75% of a surface area of the gas deflection surface.