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: HOAE-SR18) 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 340 to 1200 nm at a resolution of 1nm. 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.
Third party Source Measure Unit with (SMU) can be used for the measurement of the current through, and also to apply the voltage to, the sample. Holmarc also supply a complete solar cell characterization system (Model HO-SC-QEIV) which has internal source measure circuit to perform both IV and spectral response measurements.
|Light source||:||50W Tungsten Halogen lamp|
|Wavelength Range||:||340 nm to 1200 nm|
|Monochromator 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|
|Sample size||:||Up to 30 mm x 30 mm|
|Two probes, one movable in X axis and the other in Y axis, to make contact with the sample|
|Alternative contact option through alligator clips|
|Built-in transimpedance amplifier for the measurement of photocurrent through the sample|
|User Interface||:||Front panel LCD and keyboard / PC software|
|PC Interface||:||RS232 or USB (Using a USB to serial converter)|
|Active area||:||5.8 x 5.8 mm|
|Wavelength Range||:||320 nm to 1100 nm|
|Wavelength of Peak Sensitivity||:||960 nm|
|Photosensitivity||:||0.58 A/W at 960 nm|
|Typical Short Circuit Current at 100lx||:||31 Micro Ampere|
|Dark Current||:||50 pA|
|Rise Time||:||10 micro second|