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Quantum Efficiency & Spectral

Response Measurement System
Model: HO-SC-QE
Wavelengths from 400nm to 1200nm
Automated scanning over broad spectral range

The spectral responsivity or quantum efficiency (QE) is essential for understanding current generation, recombination, and diffusion mechanisms in photovoltaic devices. PV cell and module calibrations often require a spectral correction factor that uses the QE. The quantum efficiency in units of electron - hole pairs collected per incident photon is computed from the measured spectral response in units of amperes per watt as a function of wavelength. Model HO-SC-QE is integrated with 50W Tungsten Halogen lamp with housing, optics, power supply and an easy to use software with capability to measure the spectral response and quantum efficiency of solar cell at the wavelengths from 400nm to 1200nm.

System includes a sample stage, capable of accommodating samples up to 50 mm diameter and probes to contact the sample. Light is normally incident on the sample. Fixed frequency chopper and lock in amplifier are used for modulating the light at a frequency of 400Hz for measuring spectral response. Wavelength resolution of monochromator is 0.1nm. Illumination area can be adjusted using lens assembly system.

It can also be used for characterization / measurement of the imaging systems (cameras) and other detectors in terms of linearity range, spatial non-uniformity of response (the variation of responsivity across the active area of a detector) etc.

    Light source :     50W Tungsten Halogen lamp
    Wavelength range :     400 nm to 1200 nm
    Chopper frequency :     400 Hz
    Bias light :     3W White LED
    Sample size :     Up to 50 mm
    Sample holder with XY motion
    Optical Design :     Czerny-Turner
    Main Mirrors :     Parabolic type with Enhanced Aluminum Coating
    Focal Length :     300 mm
    Dispersion Element :     Holographic Grating
    Grating Density :     1200 l/mm
    Filter unit :     Higher order cut off filter wheel

    Controls the monochromator and the 400Hz Lock-in amplifier
    Performs scans of user defined wavelength range
    Operating system requirement :     Windows XP / 7 / 8 / 8.1 / 10
    Plots spectral response of the sample at a specified wavelength range
    Export the results to spreadsheet file
    PC Interface :     RS232 or USB (Using a USB to serial converter)

    Measurement of the spectral response and quantum efficiency of a solar cell from 400 nm to 1200nm

    50W Tungsten Halogen lamp with integrated power supply

    300 F Quasar Monochromator (400 - 1200 nm) with order sorting filters

    Sample holder with manual X-Y positioning arrangement to align the position of the light beam on the sample

    Sample size up to 50 mm

    Built-in optical chopper and lock in amplifier

    LED bias light

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