Patent ID: 9385015
Filing Date: 2016-07-05
CPC Classification: H01L

Claim Text:
1. A method for preventing particle adhesion to a target substrate in a chamber, the chamber comprising a chamber main body which is switchable between a depressurized environment and an atmospheric pressure environment, an ionization unit configured to generate an ionized gas to be supplied into the chamber main body, and a gas exhaust unit configured to exhaust the chamber main body, the method comprising: accommodating the target substrate into the chamber main body; performing a first step in which an inner pressure of the chamber main body is increased to a first pressure less than a pressure of the atmospheric pressure environment by supplying the ionized gas into the chamber main body without exhausting the chamber main body; performing a second step in which the inner pressure is decreased to a second pressure by exhausting the chamber main body while supplying the ionized gas thereinto; and performing a third step in which the inner pressure is increased to a third pressure by supplying the ionized gas into the chamber main body while stopping exhausting the chamber main body, wherein the second and third steps are both sequentially repeated a plurality of times until an environment of the chamber main body reaches the pressure of the atmospheric pressure environment, wherein the third pressure is higher than the first pressure and lower than a pressure of the atmospheric pressure environment, and the second pressure is lower than the first pressure, and wherein, for each sequential repetition of the second and third steps, the second and the third pressures of a subsequent repetition are higher than the second and third pressures, respectively, of a prior repetition of the second and third steps.