Method of producing a resistor in an integrated circuit
First Claim
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1. A method of fabricating a resistor in a semiconductor device comprising:
- providing a substrate having a dielectric layer thereon, the substrate having an active region;
providing a layer of resistor material on the dielectric layer;
providing a first masking layer over a portion of the layer of resistor material, the portion being located in a position removed from over the active region;
etching the layer of resistor material surrounding the portion, thereby forming a resistor;
removing the first mask layer;
providing a metal layer over the resistor and dielectric layer;
providing a second masking layer over the metal layer, the second masking layer defining an opening to the metal layer in a position removed from over the resistor;
etching the metal through the opening in the second masking layer, the second masking layer masking the metal over the resistor from said etchant;
removing the second masking layer;
providing a third masking layer over the metal layer, the third masking layer defining an opening to the metal layer over the resistor; and
etching the metal layer through the opening in the third masking layer.
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Abstract
The present method of forming a resistor as part of an integrated circuit includes a first masking step which blocks the resistor area of the integrated circuit from plasma etchant, with such plasma etchant meanwhile being used to define small line widths of, for example, metalization. Subsequent thereto, another layer of photoresist is applied to allow wet etching of the area of metalization above the resistor, meanwhile blocking such wet etchant from areas previously plasma etched.
35 Citations
15 Claims
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1. A method of fabricating a resistor in a semiconductor device comprising:
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providing a substrate having a dielectric layer thereon, the substrate having an active region; providing a layer of resistor material on the dielectric layer; providing a first masking layer over a portion of the layer of resistor material, the portion being located in a position removed from over the active region; etching the layer of resistor material surrounding the portion, thereby forming a resistor; removing the first mask layer; providing a metal layer over the resistor and dielectric layer; providing a second masking layer over the metal layer, the second masking layer defining an opening to the metal layer in a position removed from over the resistor; etching the metal through the opening in the second masking layer, the second masking layer masking the metal over the resistor from said etchant; removing the second masking layer; providing a third masking layer over the metal layer, the third masking layer defining an opening to the metal layer over the resistor; and etching the metal layer through the opening in the third masking layer. - View Dependent Claims (2, 3, 4, 5)
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6. A method of fabricating a thin film resistor in a semiconductor device comprising;
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providing a substrate having a dielectric layer thereon, the substrate having an active region; providing a layer of thin film resistor material on the dielectric layer; providing a layer of protective material over the thin film resistor material; forming the thin film resistor material and protective material to define configured layers thereof in a position removed from over the active region; providing a metal layer over the configured layers of thin film resistor material and protective material and the dielectric layer; providing a first layer of photoresist over the metal layer, the first layer of photoresist defining an opening to the metal layer in a position removed from over the configured thin film resistor material and protective material; etching the metal through the opening in the first layer of photoresist, the first layer of photoresist blocking the metal over the configured thin film resistor material and protective material from said etchant; removing the first layer of photoresist; providing a second layer of photoresist over the metal layer, the second layer of photoresist defining an opening to the metal layer over the configured thin film resistor material and protective material; etching the metal layer through the opening in the second layer of photoresist to expose a portion of the configured protective material; and removing the second layer of photoresist. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A method of fabricating a resistor in a semiconductor device comprising:
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providing a substrate having a dielectric layer thereon, the substrate having an active region; providing a resistor on the dielectric layer, the resistor being located in a position removed from over the active region; providing a first mask layer over the resistor and dielectric layer, the first mask layer defining an opening over the active region of the substrate; etching the dielectric layer such that an opening is formed through the dielectric to the active region of the substrate; removing the first mask layer; providing a metal layer over the resistor and dielectric layer, the metal layer extending through the opening in the dielectric layer to contact the active region of the substrate; providing a second masking layer over the metal layer, the second masking layer defining an opening to the metal layer in a position removed from over the resistor and from the opening in the dielectric layer; etching the metal through the opening in the second masking layer, the second masking layer masking the metal over the resistor from said etchant; removing the second masking layer; providing a third masking layer over the metal layer, the third masking layer defining an opening to the metal layer over the resistor; and etching the metal layer through the opening in the third masking layer. - View Dependent Claims (13, 14, 15)
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Specification