Patent ID: 8830486
Filing Date: 2014-09-09
Classification: B08B,G01B,G01N,H01L

Abstract:
1. A local purging tool for purging a portion of a surface of a wafer with purging gas, comprising: a purging chamber configured to contain purging gas within a cavity of the purging chamber, the purging chamber being positionable relative to the surface of the wafer to a local purging portion of the wafer, the wafer being external to the cavity of the purging chamber; a permeable portion of a surface of the purging chamber configured to diffuse purging gas from the cavity of the purging chamber to the local purging portion of the surface of the wafer; and an aperture configured to transmit illumination received from an illumination source to a measurement location of the local purging portion of the surface of the wafer and further configured to transmit illumination reflected from the measurement location to a detector.