Spectral response is the ratio of the current generated by the solar cell to the power incident on the solar cell or a detector. Spectral response measurement apparatus measures short circuit current of solar cell at selected wavelengths over a broad range of wavelengths.
HOLMARC's Spectral response measurement system (Model NO: HOED-SC-02) is capable of measuring the spectral response of any kind of photovoltaic devices, such as single or multi junction solar cells or sensors in an area up to 30mm2. Measurements can be taken in the wavelength range from 300 to 1600nm at a resolution of 1nm. It is also possible to apply light or voltage bias up to 10V during the measurements. Current, normalized with respect to light power versus wavelength gives spectral response of the cell. Spectral response is directly related to external quantum efficiency. The measurements can be performed manually using onboard controls or automatically by interfacing to a computer.
This measurement is performed by shining a monochromatic probe beam onto the sample and registering the photocurrent generated as a function of wavelength.