In-line Testing of
The current-voltage (IV) characteristic of a solar cell is an essential performance metric. neonsee‘s inline measurement systems provide the means to evaluate IV characteristics for quality control purposes and binning of multi-junction solar cells as well as CPV assemblies in production environments.
Reliable and accurate measurements, customized and automated test sequences along with electrical and illumination conditions that are tuneable in wide ranges serve as a basis for state-of-the-art process optimization and analyses.
neonsee‘s highly integrated turn-key IV test solutions offer full control of these parameters, all programmable by intuitive software, enabling comprehensive IV-derived loss analysis of your photovoltaic devices.
| Methods | Results |
|---|---|
| Illuminated IV | Isc , Voc , lmpp , Vmpp , FF, efficiency, Pmax , Rs , Rsh |
| Dark IV | Rsh |
| Differential Voc | dVoc = Voc (T ) – Voc (T ) thermal resistance heatsink – multi-junction solar cell |
| Temperature coefficients | a (lsc) , ß (Voc) , y (Pmax) |
| Jsc – Voc / Suns – Voc | Rs-free IV characteristics (like SINTON Instruments SUNS-VOC), pFF, FF , Rs from FF & pFF |
| Variable intensity / weak light | Isc(E), Voc(E), lmpp(E), Vmpp(E), FF(E), efficiency (E), Pmax(E), Rs(E), Rsh(E) |
| Rs according to IEC 60891 | Rs, Rs(E) |
| Temperature – voltage equivalence | V (T), V (E) |
| Diode model fitting | Diode saturation currents & ideality factors |
| Loop test | Reproduceability of Voc, Isc, FF, efficiency |
| Spectrum | Spectral distribution, mismatch factor, IEC 60904-9 & ASTM E 927 classification |
