Quantum Efficiency: QAS

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The solar cell spectral response system used is the QEX7 model from PV Measurements Inc. The unit is designed for beam-up and beam-down operation. A xenon arc lamp is employed with a dual-grating monochromator. Silicon and germanium photodiodes are used for calibration.

Equipment Specifications[edit | edit source]

  • Wavelength range: 300 nm to 1100 nm
  • Wavelength interval: 5-20 nm, selectable
  • Monochromatic beam spectral bandwidth: 4-5 nm FWHM
  • Chopping frequency range: 4-200 Hz
  • Voltage bias capability: -1.0 V to +1.0V
  • Repeatability: Better than 0.2% for 400-1050nm, better than 0.7% outside
  • Vacuum test fixture: 50mm x 50mm


More Info[edit | edit source]