Perovskite solar cells are ideal candidates for tandem solar cell technologies thanks to their bandgap tunability and high efficiency, but their stability needs to be improved for commercial applications. The operational stability of encapsulated PSCs with wide bandgaps suitable for regular and bifacial tandems was tested with 1-sun illumination and at different temperatures. For all temperatures, the decay in performance is due to a drop in current at MPP conditions, and XRD shows perovskite decomposition. Interestingly, open-circuit-voltage-decay measurements reveal a higher ion concentration for the degraded device, which correlates with the drop in current.
Thermally activated delayed fluorescent (TADF) OLEDs promise higher luminous efficiency than traditional OLEDs but suffer from a shorter lifetime, so identifying the degradation mechanisms is crucial to find a solution. In-depth electrical characterization of TADF devices during stressing at constant current revealed a shift in capacitance onset due to the formation of interfacial trap states. Simulations showed that this shift depends on the voltage applied before performing the C-V scan and that the emptying of trap states due to Shockley-Read-Hall recombination caused the shift.
We present a comprehensive approach to the characterization and modeling of photovoltaic metal-halide perovskite single junction devices and perovskite-silicon tandem solar cells. The framework is based on 1D opto-electronic device simulation in steady-state and transient modes as well as frequency domain including specific features of the perovskite materials such as mobile ions, combined with a broad variety of device characterization experiments. As a salient feature, advanced optimization algorithms are used for reliable parameter extraction and opto-electronic device optimization purposes in both single junction and tandem solar cell architectures.
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