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|
|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)|