Reduced-order Modelling of Perovskite Solar Cells
Nicola Courtier a
a Department of Engineering Science, University of Oxford, United Kingdom, Parks Road, United Kingdom
Proceedings of Device Physics Characterization and Interpretation in Perovskite and Organic Materials (DEPERO)
VALÈNCIA, Spain, 2023 October 3rd - 5th
Organizers: Sandheep Ravishankar, Juan Bisquert and Evelyne Knapp
Invited Speaker, Nicola Courtier, presentation 024
Publication date: 14th September 2023

In this talk, I will present a consistent modelling framework for perovskite solar cells that takes into account the impact of mobile ionic defects on photovoltaic performance. I will explain common perovskite device characteristics through drift-diffusion simulations and reduced-order modelling of both time- and frequency-domain measurements. We use the open-source ‘IonMonger’ code released in 2019 [1] to simulate continuum-level models which describe the effects of material properties and internal mechanisms on the behaviour of a complete device. Version 2.0 [2] can simulate a 100-point electrochemical impedance spectrum in less than a minute on a desktop computer and reproduce the distinctive ionic-electronic features exhibited by perovskite solar cells. Meanwhile, reduced-order models enable the identification of key performance metrics. I will present a simplified description of the steady-state current [3] and frequency response [4] which explains why the classical diode ideality factor is not a reliable indicator of recombination type. Instead, simulations show that we can use two factors (one electronic and one ionic) to reveal the location and type of recombination losses in a planar perovskite solar cell.

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