INDOOR AND OUTDOOR CHARACTERIZAITION OF a-Si:H P-I-N MODULES

Indoor and outdoor electrical measurements were performed on light-soaked single-junction a-Si:H p- i-n mini-modules with respect to a cr-Si reference cell matched to the a-Si spectral characteristics by an integrated optical filter. The Simplified Global Sunlight Method SGSM was applied to analyse the outdoor performance of these a-Si:H modules. In order to check if the present outdoor spectra condition is close to the AM1.5G condition in the sensitive range between 350nm to 750nm this filtered cr-Si reference cell was used. The indoor outdoor comparison of the characterisation of this filtered reference cell shows that the solar simulator result of (14.81±0.37) mV agrees well with the result of the SGSM of (15.00±0.23) mV within their combined uncertainties (k=2). The typical temperature coefficient of the STC power obtained by indoor measurements of a-Si:H mini-modules results in (-0.201±0.03)%STC/°C and also agrees well with the outdoor measurement results of (-0.175±0.03)%STC/°C, both within their respected k=2 uncertainties. Large-area a-Si:H modules (1.4m 2 ) in the initial state have been monitored under outdoor conditions during winter time. The exponential decay of the fill factor is described by a time constant of 27 hours at 1000 W/m 2 irradiance.