METHOD OF MANUFACTURING SEMICONDUCTOR DEVICE
First Claim
1. A method of manufacturing a semiconductor device provided with a stack of a first film substantially free of oxygen and a second film disposed above the first film and comprising a metal oxide containing an uneasily etched material, the method comprising:
- etching the second film by a first process using a first etch gas containing a boron trichloride containing gas and by a second process following the first process using a second etch gas containing an inert gas, the second etch gas being used in the second process while controlling a bias power to be equal to or greater than an etching threshold energy of the second film.
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Accused Products
Abstract
A method of manufacturing a semiconductor device provided with a stack of a first film substantially free of oxygen and a second film disposed above the first film and comprising a metal oxide containing an uneasily etched material is disclosed. The method includes etching the second film by a first process using a first etch gas containing a boron trichloride containing gas and by a second process following the first process using a second etch gas containing an inert gas. In the second process, the second etch gas is used while a bias power is controlled to be equal to or greater than an etching threshold energy of the second film.
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Citations
20 Claims
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1. A method of manufacturing a semiconductor device provided with a stack of a first film substantially free of oxygen and a second film disposed above the first film and comprising a metal oxide containing an uneasily etched material, the method comprising:
etching the second film by a first process using a first etch gas containing a boron trichloride containing gas and by a second process following the first process using a second etch gas containing an inert gas, the second etch gas being used in the second process while controlling a bias power to be equal to or greater than an etching threshold energy of the second film. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 12)
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11. The method according to claim wherein the uneasily etched material contains at least one material selected from the group consisting of lanthanum, yttrium, magnesium, iron, cobalt, nickel, and barium.
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13. A method of manufacturing a semiconductor device, in which a metal oxide film containing an uneasily etched material is etched using reactive ion etching, comprising:
repeating an alternate execution of a first process using a first etch gas containing a boron trichloride containing gas and a second process using a second etch gas containing an inert gas to etch the metal oxide film. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
Specification