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Quantum Efficiency

Measurement Apparatus

Model: HO-ED-SC-03

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-ED-SC-03 is integrated with 150W Xenon lamp with housing, optics and power supply with capability to measure dark lighted IV characteristics of solar cell and quantum efficiency measurement (300nm-1600nm). Computer enabled for recording data is a standard feature.

Experiment Examples

    Efficiency measurement of Standalone Solar PV System


    Measurement of current – voltage characteristics of crystalline silicon solar cell

a.    Measurement by using 4 quadrant power supply and solar cell as load

i.    in dark and

ii.   under illumination.

b.    Measurement by using solar cell as power source under illumination

System consists of :

    150 W Xenon Lamp with integrated power supply

    300 F Quasar Monochromator (300-1600 nm) with order sorting filters.

    Selectable flip mirror assembly for quantum efficiency measurement / lighted I-V measurement. For lighted IV a collimated beam of 50 mm diameter is used.

    Sample holding and x-y manual positioning unit arrangement helps to keep the sample horizontally. Sample is placed on a chuck held by vacuum.

    Electronics to measure dark and lighted I-V Characteristics : Current range - 0.1 μA to 0.75 A. Voltage range -5 V to +5 V

    Sample stage with vacuum chuck

    Chopper and lock in amplifier.

System includes a sample stage, capable of accommodating samples up to 50 mm diameter and probes to contact the sample. Sample is held by vacuum. 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. This allows current measurement capability from minimum of 0.1 μA to 1 mA. 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), temperature coefficient of response etc.

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