Patent ID: 7276125

Claim:
A barrel type susceptor used in a semiconductor epitaxial growth, the susceptor being a truncated shape, wherein the shape is that of a substantially pyramid or cone shape, the truncated shape of the susceptor comprising: a top plate; a bottom plate, an area of the bottom plate being larger than an area of the top plate; and a side plate which connects the top plate to the bottom plate, wherein the side plate is partitioned into at least two partition areas in a vertical direction of the susceptor, a concaved portion for mounting a wafer located in each partition area of the side plate, wherein each concaved portion comprises a bottom surface, each partition area of a side plate forms an inclined angle with a vertical plane passing through the susceptor and perpendicular to the top and bottom plates, wherein said angles are decreased gradually from the top plate to the bottom plate, and wherein each bottom surface of each concaved portion also forms an angle with said vertical plane, wherein said angles of the bottom surfaces are decreased gradually from the top plate to the bottom plate.