Patent ID: 7704329
Filing Date: 2010-04-27
Classification: B08B,H01L

Abstract:
1. A semiconductor substrate cleaning method comprising: a first cleaning step of cleaning a surface of a semiconductor substrate with the use of a cylindrical first brush; a second cleaning step of cleaning, after the first cleaning step, the surface of the semiconductor substrate with the use of a cylindrical second brush; and between the first cleaning step and the second cleaning step, a step of moving the first brush away from the surface of the semiconductor substrate, wherein: the first brush includes a plurality of protrusions extending in a direction substantially vertical to the rotation axis thereof, the second brush includes a plurality of protrusions extending in a direction substantially vertical to the rotation axis thereof, in the first cleaning step, the protrusions of the first brush come into contact with the surface of the semiconductor substrate, in the second cleaning step, the protrusions of the second brush come into contact with the surface of the semiconductor substrate, a pressing pressure of the protrusions of the second brush against the surface of the semiconductor substrate in the second cleaning step is lower than a pressure of the protrusions of the first brush against the surface of the semiconductor substrate in the first cleaning step, in the first cleaning step, particles are detached from the surface of the semiconductor substrate, the particles detached from the surface of the semiconductor substrate re-adhere to the surface of the semiconductor substrate due to static electricity generated in the first cleaning step, and in the second cleaning step, the particles re-adhering to the surface of the semiconductor substrate are removed.