Patent ID: 7361230

Claim:
A substrate processing apparatus for processing a substrate, comprising a substrate susceptor arranged in a chamber, wherein: said chamber comprises chamber walls that bound an enclosed chamber space in which said substrate susceptor is arranged, said chamber walls comprising a bottom wall formed as a flat planar chamber wall which has a first contact surface area with a surface roughness of Ra≦0.8 μm; and said substrate susceptor comprises a flat plate portion consisting essentially of a unitary ceramic base body and an electric circuitry arranged therein; said ceramic base body is bounded by surfaces comprising a ceramic back surface and a substrate mounting surface adapted to have the substrate mounted thereon, said ceramic back surface facing opposite said substrate mounting surface and extending parallel to said substrate mounting surface, wherein said ceramic back surface comprises a further contact surface area with a surface roughness of Ra≦0.7 μm; and wherein said first and further contact surface areas are in direct contact with each other whereby said substrate susceptor is supported by said chamber; said substrate processing apparatus further comprises a cooling apparatus positioned for cooling said chamber with which said flat plate portion is in contact.