Esma Ugur

Aug 14, 2024 | nature.com | Chongwen Li |Fangyuan Jiang |Zhaoning Song |Xiaoming Wang |Adam Balvanz |Esma Ugur | +18 more

AbstractPerovskite tandem solar cells show promising performance, but non-radiative recombination and its progressive worsening with time, especially in the mixed Sn–Pb low-bandgap layer, limit performance and stability. Here we find that mixed Sn–Pb perovskite thin films exhibit a compositional gradient, with an excess of Sn on the surface—and we show this gradient exacerbates oxidation and increases the recombination rate.