Patent ID: 6176969
Filing Date: 2001-01-23
Classification: H01J,H01L

Abstract:
A baffle plate disposed between a process chamber and a vacuum chamber of a dry etching apparatus for manufacturing semiconductor devices, the baffle plate comprising:an annular ring have an inner circumferential edge and an outer circumferential edge; anda plurality of slits formed radially along the annular ring and extending from a top surface of the annular ring to a bottom surface of the annular ring, the slits being circumferentially spaced from each other,each of the slits having an upper section extending at a positive slope from the top surface of the annular ring to a particular depth within the annular ring such that the upper section is tapered, and a lower section extending vertically from the particular depth to the bottom surface of the annular ring,wherein a circumferential width of the upper section at the top surface of the annular ring is greater than a circumferential width at the particular depth,and wherein the circumferential width at the particular depth is equal to the circumferential width at the bottom surface of the annular ring, such that the lower section has a constant width.