Method to form ultra high quality silicon-containing compound layers
First Claim
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1. A method for semiconductor processing, comprising:
- providing a substrate in a deposition chamber;
depositing a film of an insulating silicon compound on the substrate by performing a plurality of chemical vapor deposition cycles, each cycle comprising;
pyrollizing a silicon source with a substrate to form a silicon film, wherein the silicon source pyrollizes upon contact with the substrate, and wherein the silicon source for forming a first silicon film on the substrate, in a first performance of a cycle of the plurality of cycles, is trisilane; and
subsequently reacting the silicon film to form the insulating silicon compound,wherein the film of the insulating silicon compound formed by performing the plurality of deposition cycles has a thickness non-uniformity of about 5% or less and a step coverage of about 80% or greater.
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Abstract
Multiple sequential processes are conducted in a reaction chamber to form ultra high quality silicon-containing compound layers, including silicon nitride layers. In a preferred embodiment, a silicon layer is deposited on a substrate using trisilane as the silicon precursor. A silicon nitride layer is then formed by nitriding the silicon layer. By repeating these steps, a silicon nitride layer of a desired thickness is formed.
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Citations
19 Claims
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1. A method for semiconductor processing, comprising:
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providing a substrate in a deposition chamber; depositing a film of an insulating silicon compound on the substrate by performing a plurality of chemical vapor deposition cycles, each cycle comprising; pyrollizing a silicon source with a substrate to form a silicon film, wherein the silicon source pyrollizes upon contact with the substrate, and wherein the silicon source for forming a first silicon film on the substrate, in a first performance of a cycle of the plurality of cycles, is trisilane; and subsequently reacting the silicon film to form the insulating silicon compound, wherein the film of the insulating silicon compound formed by performing the plurality of deposition cycles has a thickness non-uniformity of about 5% or less and a step coverage of about 80% or greater. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A process for semiconductor processing, comprising:
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decomposing trisilane to form a silicon layer on a crystalline surface of a semiconductor substrate under mass transport limited conditions; subsequently nitriding the silicon layer to form a silicon nitride layer, wherein the silicon nitride layer has a thickness non-uniformity of about 5% or less and a step coverage of about 80% or greater; and repeating decomposing trisilane and nitriding the silicon layer until a silicon nitride layer of between about 3 A and 1000 thick results. - View Dependent Claims (15, 16)
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17. A method of thermal chemical vapor deposition, comprising:
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thermally decomposing a silicon precursor on a substrate under mass transport limited conditions to form a silicon layer, the silicon layer having a thickness non-uniformity of about 5% or less and a step coverage of about 80% or greater, wherein a height of a top surface of the silicon layer over the substrate is greater than about a nitridation saturation depth; nitriding the silicon layer; and sequentially repeating thermally decomposing the silicon precursor and nitriding the silicon layer to form a silicon nitride layer of a desired thickness. - View Dependent Claims (18, 19)
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Specification