Solar cell analysis system
Current-Voltage
The IV characteristics is measured under the illumination with an infrared LED array to determine Voc, FF, and efficiency at arbitrary light intensities. The series resistance-free Isc‑Voc characteristics is also measured and fitted to the 2-diode model. The global series resistance is found both from comparing Isc‑Voc with light-IV and from the double light method.
The noise limit in the finest current range is 0.3 µA and low enough to measure the dark characteristics on small solar cells of only a few cm².