Patent ID: 7351293

Claim:
A method of semiconductor processing, comprising: loading a semiconductor wafer into a reaction chamber, at least one of the upper or lower surfaces of the chamber comprising a pattern of grooves and gas inlets, wherein the grooves define a plurality of circle segments; wherein the center of the circle is coaxial with a center of the wafer and wherein each of the circle segments has provided in the circle segment a first hole near one end of the circle segment and a second hole arranged near the opposite end of the circle segment; floatingly supporting the wafer inside the chamber by streaming gas directly against a bottom of the wafer; rotating the floatingly supported wafer by flowing gas directly against the wafer using the first hole of the circle segment as a gas introduction hole and using the second hole of the circle segment as a gas exit hole; and reversing a direction of the wafer rotational driving force by using the first hole of the circle segments as a gas exit hole and the second hole of the circle segments as a gas introduction hole.