Determining the Ion Mobility in Perovskite Solar Cells from Impedance Spectroscopy.

ABSTRACT: Mobile ions in metal halide perovskites are found to degrade perovskite solar cells (PSCs). Therefore, characterizing their density and mobility is crucial for improving the long-term performance of PSCs. We introduce a formula to determine the mobility directly from impedance spectroscopy. The validity of the formula is confirmed through extensive drift-diffusion simulations varying 38 parameters including mobilities, ion densities, layer thicknesses, and trap densities. All in all, these simulations describe a wide variety of PSCs. Alternative formulas from the literature are also tested but are found to be suboptimal. After validation, we experimentally determine the ion mobility of a methylammonium lead iodide PSC to be 4 × 10^-10 m² V^-1 s^-1.

SUBMITTER: Elhorst FD 

PROVIDER: S-EPMC12442514 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature