Correction to: Nature Energy, published online 13 May 2019.

In the version of this Article originally published, the following text was missing from the ‘Cell fabrication and electrical testing’ section of the Methods: ‘The CdTe and CdSeTe materials were provided by 5N Plus.’ It has now been added after the sentence starting “This was followed by 1.5–2.0 µm of CdSeTe…”