System for characterizing semiconductor materials and photovolta

Details System for characterizing semiconductor materials and photovolta System for characterizing semiconductor materials and photovolta

1995-06-28

1998-05-26

Evans, F. L.

Optics: measuring and testing

With plural diverse test or art

356 30, 356237, 356446, G01N 2188

Patent

active

057574740

ABSTRACT:
A method and apparatus for measuring characteristics of a piece of material, typically semiconductor materials including photovoltaic devices. The characteristics may include dislocation defect density, grain boundaries, reflectance, external LBIC, internal LBIC, and minority carrier diffusion length. The apparatus includes a light source, an integrating sphere, and a detector communicating with a computer. The measurement or calculation of the characteristics is calibrated to provide accurate, absolute values. The calibration is performed by substituting a standard sample for the piece of material, the sample having a known quantity of one or more of the relevant characteristics. The quantity measured by the system of the relevant characteristic is compared to the known quantity and a calibration constant is created thereby.

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