How much mobile ionic charge makes a difference to perovskite solar cells?
Piers Barnes a, William Fisher a, Davide Moia b, Phil Calado a
a Imperial College London, Physics Department and Center for Processable Electronics
b Max Plank Institute for Solid State Research, Nanochemistry Department, Stuttgart, Heisenbergstraße, 1, Stuttgart, Germany
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
València, Spain, 2022 May 19th - 25th
Organizers: Pablo Docampo, Eva Unger and Elizabeth Gibson
Invited Speaker, Piers Barnes, presentation 195
Publication date: 20th April 2022

The presence of mobile ionic charge is considered the underlying cause of hysteresis and many slow transient effects in metal halide perovskite solar cells. We have developed electroabsorbance techniques that directly measure the dynamics of internal electric fields in the perovskite layer. These confirm that transient optoelectronic behaviour of perovskite devices is directly related to the changing polarisation fields attributed to redistribution of ionic charge. However, despite the transient behaviour and hysteresis being understood in general (if not always in detail), the implications of mobile charge on the steady state properties of perovskite devices is often overlooked, particularly when hysteresis is not observed in device performance. Here I will consider some of the consequences of mobile ions, and their interactions with interfaces, for the underlying properties of devices under stable operation, and assess at what concentrations do the impact of mobile ionic charge become significant.

We use our own and third party cookies for analysing and measuring usage of our website to improve our services. If you continue browsing, we consider accepting its use. You can check our Cookies Policy in which you will also find how to configure your web browser for the use of cookies. More info