Patent ID: 7133128
Filing Date: 2006-11-07
Classification: G01N

Abstract:
1. A method of measuring a value of a bulk property of a semiconductor substrate, comprising: providing a generation beam; providing an analyzer beam; focusing the generation beam and the analyzer beam on the semiconductor substrate, the generation beam generating in an area of the semiconductor substrate contacted by the generation beam a number of excess charge carriers, having a depth profile, the generated excess charge carriers reflecting the analyzer beam; detecting a predetermined characteristic of the reflected analyzer beam, the predetermined characteristic comprising a near-surface contribution relating to a component of the analyzer beam reflected near the surface of the semiconductor substrate; and determining the value of the bulk property from the predetermined characteristic of the reflected analyzer beam, the bulk property relating to a component of the analyzer beam reflected in an excess carrier profile region away from the surface of the semiconductor substrate, wherein at least the near-surface contribution is substantially eliminated from the predetermined characteristic.