DOI: https://doi.org/10.29363/nanoge.DEPERO.2023.030
Publication date: 14th September 2023
We develop an electrical model of the perovskite solar cell (PSC) that explicitly accounts for charge exchange between the perovskite layer and the electrodes, via the relatively low-mobility transport layers.[1] Analysis of the model in the frequency domain shows that the coupling of the transport layer resistance with the perovskite capacitance creates an apparent constant lifetime that can be misinterpreted as a non-radiative recombination lifetime due to a density of defects. Comparison of the model’s predictions in the time and frequency domain further allows identifying a hidden time constant in the frequency domain data, that is clearly observed as the rise time constant in the corresponding time domain measurement.[2] This time constant typically corresponds to the speed of charge extraction from the perovskite layer to the electrodes, which is an important factor determining fill factor losses in PSCs.
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