High Stable Perovskite Solar Cells using Ionic-liquid Addition and Cesium Halides Intercalation Technology

Long-term operational stability has become a major focus for perovskite solar cells (PSCs). In this study, we used the ionic liquid (IL) aided- CH
3
NH
3
PbI
3
(MAPbI
3)
perovskite nanoparticles (NPs) as a seeded-growth approach to fabricated high moisture stable PSCs with a PCE of 20% and the resultant device retained above 80% of its initial output even after 6000 hours of storage at ambience condition (non-encapsulation). In addition, we also introduced vacuum deposited CsX (CsI, CsCl, and CsBr) thin layers into solution processed host MAPbI
3
perovskite film to promote precise intercalation, resulted in greatly altered perovskite morphology with large grain sizes for high stable PSCs.