Evaluation method for polycrystalline silicon film
First Claim
1. An evaluation method for a polycrystalline silicon film, comprising:
- a first step of forming an insulating film on a silicon substrate and forming an opening in the insulating film;
a second step of depositing a polycrystalline silicon film on the overall area of the insulating film and the silicon substrate;
a third step of doping the polycrystalline silicon film with an impurity and performing heat treatment to form a diffused layer in a surface region of the silicon substrate through the polycrystalline silicon film in the opening of the insulating film; and
a fourth step of evaluating the diffused layer formed by the third step to evaluate a film quality of the polycrystalline silicon film in accordance with said impurity of said diffused layer.
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Abstract
The invention provides an evaluation method for a polycrystalline silicon film by which the film quality of a polycrystalline silicon film can be evaluated by a simple method. A silicon oxide film is formed on a p-type silicon substrate, and a photo-resist film having two openings therein is formed on the silicon oxide film. The silicon oxide film is etched to form openings therein, and a polycrystalline silicon film is deposited. Then, arsenic is ion implanted, and heat treatment is performed to form a diffused layer. The polycrystalline silicon film is patterned to form polycrystalline silicon electrodes. A voltage is applied between the polycrystalline silicon electrodes to measure a withstanding voltage and a condition of the diffused layer is recognized, and evaluation of the film quality of the polycrystalline silicon film and an interface condition between the polycrystalline silicon film and the p-type silicon substrate is performed based on the recognition.
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Citations
6 Claims
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1. An evaluation method for a polycrystalline silicon film, comprising:
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a first step of forming an insulating film on a silicon substrate and forming an opening in the insulating film; a second step of depositing a polycrystalline silicon film on the overall area of the insulating film and the silicon substrate; a third step of doping the polycrystalline silicon film with an impurity and performing heat treatment to form a diffused layer in a surface region of the silicon substrate through the polycrystalline silicon film in the opening of the insulating film; and a fourth step of evaluating the diffused layer formed by the third step to evaluate a film quality of the polycrystalline silicon film in accordance with said impurity of said diffused layer. - View Dependent Claims (2, 3, 4, 5)
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6. An evaluation method for a polycrystalline silicon film, comprising:
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a first step of forming an insulating film on a silicon substrate and forming an opening in the insulating film; a second step of depositing a polycrystalline silicon film on the overall area of the insulating film; a third step of doping the polycrystalline silicon film with an impurity and performing heat treatment to form a diffused layer in a surface region of the silicon substrate through the polycrystalline silicon film in the opening of the insulating film; and a fourth step of evaluating the diffused layer formed by the third step thereby to evaluate a film quality of the polycrystalline silicon film; wherein, after the third step, the polycrystalline silicon film is patterned to form a pair of electrodes which contact with the diffused layer, and in the fourth step, an electric resistance of the diffused layer is measured making use of the electrodes.
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Specification