Maximizing and stabilizing luminescence from halide perovskites with potassium passivation

Maximizing and stabilizing luminescence from halide perovskites with potassium passivation Nature 555, 7697 (2018). doi:10.1038/nature25989 Authors: Mojtaba Abdi-Jalebi, Zahra Andaji-Garmaroudi, Stefania Cacovich, Camille Stavrakas, Bertrand Philippe, Johannes M. Richter, Mejd Alsari, Edward P. Booker, Eline M. Hutter, Andrew J. Pearson, Samuele Lilliu, Tom J. Savenije, Håkan Rensmo, Giorgio Divitini, Caterina Ducati, Richard H. Friend & Samuel D. Stranks Metal halide perovskites are of great interest for various high-performance optoelectronic applications. The ability to tune the perovskite bandgap continuously by modifying the chemical composition opens up applications for perovskites as coloured emitters, in building-integrated photovoltaics, and as components of tandem photovoltaics to increase the power conversion efficiency. Nevertheless, performance is limited by non-radiative losses, with luminescence yields in state-of-the-art perovskite solar cells still far from 100 per cent under standard solar illumination conditions. Furthermore, in mixed halide perovskite systems designed for continuous bandgap tunability (bandgaps of approximately 1.7 to 1.9 electronvolts), photoinduced ion segregation leads to bandgap instabilities. Here we demonstrate substantial mitigation of both non-radiative losses and photoinduced ion migration in perovskite films and interfaces by decorating the surfaces and grain boundaries with passivating potassium h...
Source: Nature - Category: Research Authors: Tags: Letter Source Type: research