METHOD FOR DEPOSITING THIN FILM ON WAFER

摘要

Provided is a method of depositing a thin film. The method is performed using a thin film deposition apparatus that includes a reaction chamber having a wafer block located in a chamber to heat a loaded wafer up to a predetermined temperature, a top lid covering the chamber to seal the chamber, and shower head coupled under the top lid and having a first injection hole and a second injection hole, through which a first reaction gas and a second reaction gas are injected into the wafer, a reaction gas supplying unit supplying the first and second reaction gases into the reaction chamber, and a gas heating path unit installed on a second conveying line between first and second conveying lines connecting the reaction chamber and the reaction gas supplying unit to heat the gas passing through itself, and the method includes the operations of: loading the wafer on the wafer block; depositing a thin film by injecting the first reaction gas and the second reaction gas that is thermally activated onto the wafer through the first and second injection holes; flowing a heat treatment gas including an H element onto the thin film to reduce impurities included in the thin film; and unloading the wafer, on which the thin film is deposited, from the wafer block. If the second reaction gas has a temperature of T1 before passing through the gas heating path unit and a temperature of T2 after passing through the gas heating path unit, T2 is higher than T1, and if the heat treatment gas has a temperature of T1 before passing through the gas heating path unit and a temperature of T3 after passing through the gas heating path unit, T3 is same as T1 or higher.