Study of Spectral and Time-Differential Artefacts in Solar Cell IV-Testing

28th European Photovoltaic Solar Energy Conference and Exhibition; 1592-1594
We have carried out experiments to investigate time-differential effects in the electrical characterization of solar cells. A series of measurements on different types of solar cells has been performed. First, the stability of the illumination spectrum has been studied for flash pulses with up to 100ms duration. Time-resolved spectra were recorded at different times within the flash pulse and the spectral match was calculated for each measurement according to the IEC 60904-9 procedure. Results show an excellent stability of spectral classification over time. Futhermore temporal response of different types of solar cells has been studied by varying the properties of the IV characterization measurement. The effect of different measurement duration, delay of the IV measurement and varying hysteresis measurements on measured solar cell performance has been investigated. Results show effects of measurement duration and scan direction (Isc to Uoc or Uoc to Isc) on Uoc and cell efficiency, whereas measurement delay has no significant influence. Furthermore, Isc is found to be unaffected by variations in IV measurement conditions.