Patent ID: 11948777
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  C | IPC C  H

Claim 14:
15. A method of manufacturing a semiconductor device, the method comprising:
etching an etch target layer by a first target etching amount; and
further etching the etch target layer by a second target etching amount,
wherein the etching of the etch target layer by the first target etching amount comprises:
providing a first process gas comprising oxygen and a second process gas comprising carbon and fluorine to a process chamber at a first flow rate ratio to etch the etch target layer, the process chamber providing a space for treating the etch target layer and the first flow rate ratio being a ratio of a flow rate of the second process gas to a flow rate of the first process gas; and
providing the first process gas and the second process gas to the process chamber at a second flow rate ratio to passivate the etch target layer, the second flow rate ratio being a ratio of a flow rate of the second process gas to a flow rate of the first process gas,
wherein the providing of the first process gas and the second process gas at the first flow rate ratio and the providing of the first process gas and the second process gas at the second flow rate ratio are alternately and iteratively performed,
wherein, in the providing of the first process gas and the second process gas at the first flow rate ratio and the providing of the first process gas and the second process gas at the second flow rate ratio, the first process gas is provided at a first flow rate that is substantially constant,
wherein the further etching of the etch target layer by the second target etching amount comprises:
providing the first process gas and the second process gas to the process chamber at a third flow rate ratio to etch the etch target layer, the third flow rate ratio being a ratio of a flow rate of the second process gas to a flow rate of the first process gas; and
providing the first process gas and the second process gas to the process chamber at a fourth flow rate ratio to passivate the etch target layer, the fourth flow rate ratio being a ratio of a flow rate of the second process gas to a flow rate of the first process gas,
wherein the providing of the first process gas and the second process gas at the third flow rate ratio and the providing of the first process gas and the second process gas at the fourth flow rate ratio are alternately and iteratively performed,
wherein, in the providing of the first process gas and the second process gas at the third flow rate ratio and the providing of the first process gas and the second process gas at the fourth flow rate ratio, the first process gas is provided at a second flow rate that is substantially constant, and
wherein the second flow rate is greater than the first flow rate.