Method for recirculating high-temperature etching solution
First Claim
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1. A method for recirculating a high-temperature etching solution, comprising the steps of:
- continuously removing, from an etching bath in which a wafer for a semiconductor device is etched, a portion of an etching solution contained in the etching bath;
detecting a temperature of said bath;
injecting a predetermined amount of pure water for adjusting the concentration of the etching solution into the removed etching solution in response to said detected temperature, said predetermined amount being selected as a function of a difference between the detected etching bath temperature and a preset boiling temperature, wherein the amount of water injected corresponds to said temperature difference;
heating the resulting solution to a predetermined temperature andrecirculating the heated solution into the etching bath.
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Abstract
A method for recirculating a high-temperature etching solution according to the present invention comprises the steps of continuously removing, from a bath for etching a wafer for a semiconductor device, a portion of an etching solution contained in the etching bath, injecting a predetermined amount of pure water for adjusting the concentration of the etching solution into the removed etching solution, heating the resulting solution to a predetermined temperature, and recirculating the heated solution into the etching bath.
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4 Claims
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1. A method for recirculating a high-temperature etching solution, comprising the steps of:
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continuously removing, from an etching bath in which a wafer for a semiconductor device is etched, a portion of an etching solution contained in the etching bath; detecting a temperature of said bath; injecting a predetermined amount of pure water for adjusting the concentration of the etching solution into the removed etching solution in response to said detected temperature, said predetermined amount being selected as a function of a difference between the detected etching bath temperature and a preset boiling temperature, wherein the amount of water injected corresponds to said temperature difference; heating the resulting solution to a predetermined temperature and recirculating the heated solution into the etching bath. - View Dependent Claims (2, 3, 4)
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