Nature Energy 2, 16177 (2017); published 14 November 2016; corrected 3 April 2017.
In the original version of this Article, a recent publication was inadvertently omitted. This has now been included and the relevant sentences have been updated to ‘Recently, it was also used in perovskite solar cells in order to increase the efficiency and to reduce the hysteresis23–27. During the final preparation of this Article, ref. 28 was published, reporting planar perovskite solar cells with an average PCE around 18.5% and a mild hysteresis.’
28. Anaraki, E. H. et al. Highly efficient and stable planar perovskite solar cells by solution-processed tin oxide. Energy Environ. Sci. 9, 3128–3134 (2016).