Patent ID: 9177816
Filing Date: 2015-11-03
Classification: B05D,H01L

Abstract:
1. A deposit removal method, comprising: preparing a substrate having a pattern on which a deposit is deposited, the pattern being formed by etching; exposing the substrate to oxygen plasma while heating; and exposing the substrate to a mixed gas of hydrogen fluoride gas and alcohol gas in a chamber while repeating a first period and a second period alternately after the step of exposing the substrate to the oxygen plasma, wherein a first partial pressure of alcohol gas in the chamber in the first period enables removal of the deposit by the mixed gas, a second partial pressure of alcohol gas in the chamber in the second period being lower than the first partial pressure, wherein the first and second periods are about 5 to 20 seconds, and wherein the first and second partial pressures are adjusted by controlling a pumping rate while supplying the mixed gas at a fixed flow rate.