Comparison of traceable calibrations for filtered reference cells

Results from traceable calibrations of PV reference cells are compared. Two primary calibration methods were used, namely the differential spectral responsivity (DSR) method at the Physikalisch-Technische Bundesanstalt (PTB) and the direct sunlight method (DSM) at the European Solar Test Installation (ESTI). Furthermore, secondary calibrations were also made at ESTI against the World Photovoltaic Scale (WPVS). The calibration of c-Si reference cells is well established. Here we investigate the extension to filtered c-Si reference cells. Calibrations were performed on three cells. One unfiltered c-Si reference cell was used for control, confirming the good agreement in the calibration of such devices reported previously. Furthermore, two filtered c-Si PV reference cells were calibrated using the same methods. The agreement between the methods is studied and possible sources for discrepancies are investigated. The spectral mismatch correction is identified as crucial factor. The variation in the spectral mismatch correction with variation in measurement of spectral responsivity is found to be within uncertainty limits, whereas the measurement of spectral irradiance of the simulator can contribute much larger uncertainties due to artefacts in the spectral region around 1050 nm. A correction of the measured data alleviates the effect, so that the equivalence of all methods is demonstrated.

MUELLEJANS Harald;  KROEGER Ingo;  ZAAIMAN Willem;  PAVANELLO Diego;  SALIS Elena;  GALLEANO Roberto; 

2017-11-16

WIP GmbH & Co-KG

JRC105736

3-936338-47-7,   

2196-100X,   

https://publications.jrc.ec.europa.eu/repository/handle/JRC105736,   

10.4229/EUPVSEC20172017-5BO.6.1,