Method and apparatus for cold wall chemical vapor deposition
First Claim
1. A CVD reactor comprising:
- a chamber containing;
a first thermal plate,a second thermal plate positioned below said first thermal plate, wherein a wafer is interposed between said first and second thermal plates and not in contact with first and second thermal plates; and
a thermal ring plate laterally surrounding an outer edge of said wafer;
a first heat source positioned above said first thermal plate, said first thermal plate absorbing heat energy emitted from said first heat source and heating said wafer;
a second heat source having first and second portions and positioned below said second thermal plate, said second thermal plate absorbing heat energy emitted from said first portion of second heat source and heating said wafer, said thermal ring plate absorbing heat energy emitted from said second portion of said second heat source and heating said outer edge of said wafer.
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Abstract
A CVD reactor includes a vacuum chamber having first and second thermal plates disposed therein and two independently-controlled multiple-zone heat sources disposed around the exterior thereof. The first heat source has three zones and the second heat source has two zones. A wafer to be processed is positioned below the first thermal plate and immediately above the second thermal plate, thereby being indirectly heated from above by the first heat source via the first thermal plate and indirectly heated from below by the first zone of the second heat source via the second thermal plate. A thermal ring plate which laterally surrounds the edge of the wafer absorbs heat energy emitted from the second zone of the second heat source and heats the outer edge of the wafer. First and second sensors embedded in the first thermal plate and the thermal ring plate, respectively, measure and provide the respective temperatures thereof to a computer which, in response thereto, adjusts power to the three zones of the first heat source and the two zones of the second heat source to maintain the first thermal plate and the thermal ring plate, respectively, at a constant temperature. In this manner, a uniform temperature is maintained across the wafer.
123 Citations
9 Claims
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1. A CVD reactor comprising:
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a chamber containing; a first thermal plate, a second thermal plate positioned below said first thermal plate, wherein a wafer is interposed between said first and second thermal plates and not in contact with first and second thermal plates; and a thermal ring plate laterally surrounding an outer edge of said wafer; a first heat source positioned above said first thermal plate, said first thermal plate absorbing heat energy emitted from said first heat source and heating said wafer; a second heat source having first and second portions and positioned below said second thermal plate, said second thermal plate absorbing heat energy emitted from said first portion of second heat source and heating said wafer, said thermal ring plate absorbing heat energy emitted from said second portion of said second heat source and heating said outer edge of said wafer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification