GuanineāStabilized Formamidinium Lead Iodide Perovskites
Formamidinium (FA) lead iodide perovskite materials feature promising photovoltaic performances and superior thermal stabilities. However, conversion of the perovskite Ī±āFAPbI3 phase to the thermodynamically stable yet photovoltaically inactive Ī“āFAPbI3 phase compromises the photovoltaic performance. A strategy is presented to address this challenge by using lowādimensional hybrid perovskite materials comprising guaninium (G) organic spacer layers that act as stabilizers of the threeādimensional Ī±āFAPbI3 phase. The underlying mode of interaction at the atomic level is unraveled by means of solidāstate nuclear magnetic resonance spectroscopy, Xāray crystallography, transmission electron microscopy, molecular dynamics simulations, and DFT calculations. Lowādimensionalāphaseācontaining hybrid FAPbI3 perovskite solar cells are obtained with improved performance and enhanced longāterm stability.
Angew Chem Manuscript Guanine.pdf
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