Patent ID: 9612056
Date: 2017-04-04
CPC Classifications: F27B,F27D,H01L,H05B

Claim:
1. An apparatus comprising: a first portion configured to hold an overlying wafer, the first portion including a central region and an edge region circumscribing the central region, the first portion including an upper surface and a lower surface; a second portion including an upper surface and a single lower surface that extends beyond the wafer to an outer edge; and an interface region between the first portion and the second portion, wherein a upper surface of the interface region provides a transition from the upper surface of the first portion to the upper surface of the second portion, wherein the lower surface of the first portion in the edge region, a lower surface of the interface region, and the lower surface of the second portion are in a single common plane extending to the outer edge, wherein, the lower surface of the first portion in the central region has a first reflective characteristic, wherein the lower surface of the first portion in the edge region and the second portion have a second reflective characteristic different from the first reflective characteristic, and wherein the lower surface of the first portion in the central region includes a Heraeus Reflective Coating (HRC).