https://www.pv-magazine.com/2018/10/12/swiss-research-group-develops-methylammonium-free-perovskite-cells/
http://science.sciencemag.org/content/early/2018/10/10/science.aat3583
read both
https://www.pv-magazine.com/2018/10/12/swiss-research-group-devel...
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