IEEE PVSC 49
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SPLTRAK Abstract Submission
Seasonal dependence of diurnal efficiency degradation and recovery in perovskite mini-modules during outdoor testing 
Vasiliki Paraskeva1, Maria Hadjipanayi1, Matthew Norton1, Aranzazu Aguirre2, Afshin Hadipour2, George E. Georghiou1
1University of Cyprus, Nicosia, Cyprus
/2IMEC , Leuven, Belgium

The degree of diurnal efficiency degradation and recovery in perovskite-based devices during day and night cycles is a critical issue for researchers in the field. The diurnal efficiency degradation and subsequent recovery of several identical encapsulated mini-modules have been investigated during their outdoor testing over different seasons to study recovery trends in the perovskite-based devices. Efficiency and recovery studies over several months of outdoor testing demonstrate seasonal dependence of recovery and diurnal efficiency degradation in perovskite devices. The higher irradiation and ambient temperatures during summer months were found to enhance diurnal efficiency degradation to recovery ratio the first days of testing leading to significant accelerated performance degradation in perovskite modules tested in those conditions. For the rest of the tested period and after the modules lost significant amount of performance, smaller diurnal efficiency degradation and recovery values were obtained compared to modules tested outdoors in winter months. Temperature and irradiance levels just after the outdoor exposure of modules in the field is critical for the perovskite modules operation. Data analysis gives evidence that the temperature is the main factor that determines the daily efficiency degradation and recovery processes and thus performance degradation in perovskite mini modules outdoors.