Abstract
This paper discusses the characterisation of different CdTe modules and the main issues raised by such technology compared to conventional Si devices, from indoor STC (1000 W/m 2, AM1.5G spectrum, 25°C) performance to the actual outdoor field data. The choice of the reference detector, indoor to outdoor calibration, hysteresis, transient effects and stability are variables that make the intercomparison of data difficult, and this work aimed to contribute to their classification and systematisation. Indoor calibration values reasonably agree with outdoor performance when a spectral mismatch factor correction is applied to short circuit current. However, the fill factor is underestimated. Temperature coefficients show different trends and classic approaches to translation equation for temperature and irradiance fail. Finally, the importance of STC performance with respect to actual field performance was analysed over a period covering 3 months of outdoor testing.
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