This appears to be the source paper: https://www.nature.com/articles/s41560-018-0258-1 https://www.nature.com/articles/s41560-018-0258-1 ... and NREL press rel

This appears to be the source paper: https://www.nature.com/articles/s41560-018-0258-1 https://www.nature.com/articles/s41560-018-0258-1 ... and NREL press release: https://www.nrel.gov/news/press/2018/nrel-identifies-where-new-solar-technologies-can-be-flexible.html https://www.nrel.gov/news/press/2018/nrel-identifies-where-n...