Methods for reducing cell pitch in semiconductor devices
First Claim
1. A method, comprising:
- providing a substrate having a plurality of features comprising a first material;
forming a layer over the substrate and the plurality of features, the layer comprising a second material;
removing the layer down to upper surfaces of the plurality of features, thereby exposing the plurality of features; and
removing the plurality of features.
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Abstract
A method for forming a semiconductor device having a reduced pitch is provided. A pad oxide layer is formed on a substrate, and a silicon nitride layer is formed on the pad oxide layer. A trimmed photoresist layer is formed on the silicon nitride layer, and the silicon nitride layer is etched using the trimmed photoresist layer as an etch mask. The trimmed photoresist layer is removed until the silicon nitride layer is completely exposed, and an exposed portion of the pad oxide layer is removed until a portion of the substrate is exposed. A gate oxide layer is formed on the exposed portion of the substrate. A poly layer is deposited on the silicon nitride layer, and the poly layer is etched back to form a plurality of poly gates. Then, the silicon nitride layer is removed.
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Citations
26 Claims
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1. A method, comprising:
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providing a substrate having a plurality of features comprising a first material;
forming a layer over the substrate and the plurality of features, the layer comprising a second material;
removing the layer down to upper surfaces of the plurality of features, thereby exposing the plurality of features; and
removing the plurality of features. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for forming a semiconductor device having a reduced pitch, comprising:
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providing a substrate having a first insulating layer formed thereon;
forming a material layer on the first insulating layer;
forming a photoresist layer on the material layer;
etching the material layer using the photoresist layer as an etch mask;
removing the photoresist layer;
removing an exposed portion of the first insulating layer;
forming a second insulating layer on an exposed portion of the substrate;
depositing a conductive layer over the material layer and second insulating layer;
etching back the conductive layer to expose the material layer; and
removing the material layer. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. A structure comprising:
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a plurality of gate conductors laterally spaced apart on a substrate;
a plurality of first dielectric portions laterally spaced apart on the substrate, wherein first dielectric portions are laterally interspersed between gate conductors; and
a plurality of second dielectric portions, each of the second dielectric portions being disposed between the substrate and one of the gate conductors. - View Dependent Claims (23, 24, 25, 26)
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Specification