Journal Article

FZJ-2021-02199

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Discovery of temperature-induced stability reversal in perovskites using high-throughput robotic learning

Zhao, Y. (Corresponding author)FZJ* ; Zhang, J. ; Xu, Z. ; Sun, S. ; Langner, S. ; Hartono, N. T. P. ; Heumueller, T. ; Hou, Y. ; Elia, J. ; Li, N.FZJ* ; Matt, G. J. ; Du, X.FZJ* ; Meng, W. ; Osvet, A. ; Zhang, K. ; Stubhan, T.FZJ* ; Feng, Y. ; Hauch, J.FZJ* ; Sargent, E. H. ; Buonassisi, T. ; Brabec, C. J.FZJ*

2021
Nature Publishing Group UK [London]

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Please use a persistent id in citations: http://hdl.handle.net/2128/27808  doi:10.1038/s41467-021-22472-x

Abstract: Stability of perovskite-based photovoltaics remains a topic requiring further attention. Cation engineering influences perovskite stability, with the present-day understanding of the impact of cations based on accelerated ageing tests at higher-than-operating temperatures (e.g. 140°C). By coupling high-throughput experimentation with machine learning, we discover a weak correlation between high/low-temperature stability with a stability-reversal behavior. At high ageing temperatures, increasing organic cation (e.g. methylammonium) or decreasing inorganic cation (e.g. cesium) in multi-cation perovskites has detrimental impact on photo/thermal-stability; but below 100°C, the impact is reversed. The underlying mechanism is revealed by calculating the kinetic activation energy in perovskite decomposition. We further identify that incorporating at least 10 mol.% MA and up to 5 mol.% Cs/Rb to maximize the device stability at device-operating temperature (<100°C). We close by demonstrating the methylammonium-containing perovskite solar cells showing negligible efficiency loss compared to its initial efficiency after 1800 hours of working under illumination at 30°C.

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Contributing Institute(s):

1. Helmholtz-Institut Erlangen-Nürnberg Erneuerbare Energien (IEK-11)

Research Program(s):

1. 121 - Photovoltaik und Windenergie (POF4-121) (POF4-121)

Appears in the scientific report 2021

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