Patent ID: 9574264
Date: 2017-02-21
CPC Classifications: C23C

Claim:
1. A method for evaporation depositing uniform thin films, provided for evaporation depositing the thin film on a substrate in a vacuum environment system to enhance the uniformity of the thin film by maintaining the deposition rate, and the method comprising the steps of: placing at least one evaporation material in at least one evaporation vessel, and heating the evaporation material by at least one heater, wherein a cover is installed on a wall of the evaporation vessel; controlling the evaporation by the cover, such that the interior of the evaporation vessel has a first vapor saturation pressure when the evaporation material is heated to an evaporation state; flowing a vapor of the evaporation material towards a pressure stabilizing chamber, such that the interior of the pressure stabilizing chamber has a second vapor saturation pressure, wherein the second vapor saturation pressure is smaller than the first vapor saturation pressure, so that the vapor of the evaporation material continues flowing into the pressure stabilizing chamber; and the vacuum environment system has a vacuum background pressure, and the vacuum background pressure is smaller than the second vapor saturation pressure, and the vapor of the evaporation material flows from the pressure stabilizing chamber to the vacuum environment system due to the pressure difference between the second vapor saturation pressure and the vacuum background pressure, so as to evaporation depositing the substrate at a constant rate.