Microseconds, milliseconds and seconds: deconvoluting the dynamic behaviour of planar perovskite solar cells

TL;DR

This paper introduces a coupled ionic-electronic model to explain the complex transient and impedance behaviors observed in planar perovskite solar cells, highlighting the role of ionic environment in device performance.

Contribution

The paper presents a new, straightforward coupled ionic-electronic model that explains both frequency and time-dependent responses of perovskite solar cells.

Findings

Model explains large amplitude transient behavior

Model accounts for impedance response

Highlights ionic environment's role in device behavior

Abstract

Perovskite solar cells (PSC) are shown to behave as coupled ionic-electronic conductors with strong evidence that the ionic environment moderates both the rate of electron-hole recombination and the band offsets in planar PSC. Numerous models have been presented to explain the behavior of perovskite solar cells, but to date no single model has emerged that can explain both the frequency and time dependent response of the devices. Here we present a straightforward coupled ionic-electronic model that can be used to explain the large amplitude transient behavior and the impedance response of PSC.