Request InfoSciencetech Inc.A quantum efficiency system uses two light sources simultaneously to illuminate the solar cell being tested. Sciencetech Inc.’s SKU: SS-QE-150 quantum efficiency (QE) system comprises a 150-W tunable-wavelength monochromatic light source and a separate solar simulator for use as the white light bias. The light source is identical to the one used for the spectral response system, with a motorized optical chopper between the xenon light source and the scanning monochromator to modulate the light. 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