Correction to: Nature Reviews Materials, published online 19 June 2020.

This article was originally published without an acknowledgements section. The acknowledgement “This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No 751277 and from Plan TL Encargo project of the BSC” has been added in the online version and in the pdf.