Proceedings of MATSUS Fall 2024 Conference (MATSUSFall24)
DOI: https://doi.org/10.29363/nanoge.matsusfall.2024.242
Publication date: 28th August 2024
Ion migration is usually viewed as detrimental to the performance of perovskite solar cells. In particular, the high mobility of the halide anions can initiate phase separation and other material changes which lead to bulk and interface degradation and loss of cell efficiency.
On the other hand, it is becoming clear that if ion mediated degradation can be prevented, then there are many benefits to the presence of mobile ions in perovskites.
Recently it has been demonstrated computationally and experimentally that mobile ions improve the performance of perovskite cells with non-ideal interfacial band offsets [1][2]. The interplay between ion location and charge recombination can also be used to gain key information about the band off-sets in fully operational devices [3]. The ion mediated low frequency impedance response can tell us whether a cell is electron or hole recombination limited and indicate which interface is limiting cell performance [4]. In this presentation the benefits and disadvantages of mobile ions will be discussed; with a particular focus on the key information the ionic response can give us in common characterisation techniques such as JV curves and impedance spectroscopy.
[1] Córdoba, M., Taretto, K., 2024. Insight into the Dependence of Photovoltaic Performance on Interfacial Energy Alignment in Solar Cells with Mobile Ions. Solar RRL 8. https://doi.org/10.1002/solr.202300742
[2] Hart, L.J.F., Angus, F.J., Li, Y., Khaleed, A., Durrant, J.R., Djurišić, A., Docampo, P., Barnes, P.R.F., ArXiv pre-print 2024, More is Different: Mobile Ions Improve the Design Tolerances of Perovskite Solar Cells https://arxiv.org/abs/2407.04523
[3] Hill, N.S., Cowley, M.V., Gluck, N., Fsadni, M.H., Clarke, W., Hu, Y., Wolf, M.J., Healy, N., Freitag, M., Penfold, T.J., Richardson, G., Walker, A.B., Cameron, P.J., Docampo, P., 2023. Ionic Accumulation as a Diagnostic Tool in Perovskite Solar Cells: Characterizing Band Alignment with Rapid Voltage Pulses. Advanced Materials 35. https://doi.org/10.1002/adma.202302146
[4] Bennett, L.J., Riquelme, A.J., Anta, J.A., Courtier, N.E., Richardson, G., 2023. Avoiding Ionic Interference in Computing the Ideality Factor for Perovskite Solar Cells and an Analytical Theory of Their Impedance-Spectroscopy Response. Physical Review Applied 19. https://doi.org/10.1103/physrevapplied.19.014061
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