Patent ID: 9300229
Filing Date: 2016-03-29
CPC Classification: H01L,H02N

Claim Text:
1. An electrostatic chuck, comprising: a ceramic dielectric substrate having a first major surface on which an object to be processed is mounted, and a second major surface on a side opposite the first major surface, the ceramic dielectric substrate being a polycrystalline ceramic sintered body; and an electrode layer interposed between the first major surface and the second major surface of the ceramic dielectric substrate, the electrode layer being integrally sintered with the ceramic dielectric substrate, a temperature control plate provided on the second major surface side; and a heater provided between the electrode layer and the temperature control plate, the ceramic dielectric substrate including a first dielectric layer between the electrode layer and the first major surface, and a second dielectric layer between the electrode layer and the second major surface, the electrode layer includes a first portion having conductivity, and a second portion having infrared spectral transmittance greater than the first portion, and the first dielectric layer and the second dielectric layer of the ceramic dielectric substrate having an infrared spectral transmittance in terms of a thickness of 1 mm of not less than 20%.