AMaSiS 2021 - Abstract

Abdel, Dilara

Modeling and simulation of charge transport in perovskite solar cells

Coauthors: Petr Vágner, Jürgen Fuhrmann and Patricio Farrell
Weierstrass Institute, Germany

Perovskite solar cells have become one of the fastest growing photovoltaic technologies within the last few years. However, their commercialization is still in its early stages. Furthermore, which exact physical operation mechanisms play a fundamental role within such devices is not fully understood yet, but it is shown in experiments that besides the movement of electric carriers, ion movement within the perovskite needs to be taken into account. For this reason it is paramount to understand the electronic-ionic charge transport in perovskites better via improved modelling and simulation.
In our contribution, we present a new drift-diffusion model for the charge transport in perovskite solar cells based on fundamental principles of thermodynamics and statistical physics. Unlike other models in the literature, our model is formulated in terms of quasi Fermi potentials instead of densities. This allows to easily include nonlinear diffusion (based on Fermi--Dirac, Gauss--Fermi or Blakemore statistics for example) as well as limit the ion depletion (via the Fermi--Dirac integral of order -1). Finally, we present a finite volume based solver and corresponding simulations to underline the importance of our modelling approach.