MOCVD method and apparatus
First Claim
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1. A metalorganic chemical vapor deposition reactor comprising:
- an enclosure having a central axis;
a substrate holder within the enclosure;
means for rotating the substrate holder;
an inlet tube for transmitting gases into one end of the enclosure in an axial direction;
a baffle plate arranged transverse to said axis;
an injection plate parallel to the baffle plate and located on the side of the baffle plate opposite the inlet tube, the center of the injection plate being substantially coincident with the central axis of the enclosure;
means for guiding gases including metalorganic gases from the inlet tube around the periphery of the baffle plate so as to flow radially inwardly along one surface of the injection plate;
the substrate holder being arranged parallel to the injection plate and opposite the baffle plate;
and means comprising a plurality of slots in the injection plate for permitting said gases to be transmitted through the injection plate toward the substrate holder, the slots being arranged radially with respect to the center of the injection plate with each slot being narrower at the end nearest the center of the injection plate than at the end nearest the periphery of the injection plate, whereby the rate of transmission through the injection plate is non-uniform with respect to radial distance along said one surface of said injection plate.
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Abstract
In an MOCVD reactor, gases are channeled around the periphery of a baffle plate (15) so as to flow radially inwardly along a slotted injection plate (16). The slots (22) in the injection plate extend radially and are of non-uniform width so as to compensate for a non-uniform rate of deposition. The resultant flow over a rotating heated substrate (17) gives a more uniform deposit of epitaxially grown material.
36 Citations
5 Claims
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1. A metalorganic chemical vapor deposition reactor comprising:
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an enclosure having a central axis; a substrate holder within the enclosure; means for rotating the substrate holder; an inlet tube for transmitting gases into one end of the enclosure in an axial direction; a baffle plate arranged transverse to said axis; an injection plate parallel to the baffle plate and located on the side of the baffle plate opposite the inlet tube, the center of the injection plate being substantially coincident with the central axis of the enclosure; means for guiding gases including metalorganic gases from the inlet tube around the periphery of the baffle plate so as to flow radially inwardly along one surface of the injection plate; the substrate holder being arranged parallel to the injection plate and opposite the baffle plate; and means comprising a plurality of slots in the injection plate for permitting said gases to be transmitted through the injection plate toward the substrate holder, the slots being arranged radially with respect to the center of the injection plate with each slot being narrower at the end nearest the center of the injection plate than at the end nearest the periphery of the injection plate, whereby the rate of transmission through the injection plate is non-uniform with respect to radial distance along said one surface of said injection plate. - View Dependent Claims (2, 3, 4, 5)
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Specification