The PV parameters of triple cation perovskite solar cells are studied focusing on the electro-optical properties and differences in performance at low and high temperatures. A parasitic barrier to carrier extraction at low temperatures causes a loss of performance at T < 200 K. Combined Intensity and temperature dependent measurements suggest that extraction across this parasitic interface is constrained by a combination of the binding energy of the excitons and thermionic emission. However, the performance of the device is restored at low intensity_ where the thermionic extraction rate exceeds the photocarrier generation.
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