Guanine-Stabilized Formamidinium Lead Iodide Perovskites

Li Hong, Jovana V. Milić, Paramvir Ahlawat, Marko Mladenović, Dominik J. Kubicki, Farzaneh Jahanabkhshi, Dan Ren, María C. Gélvez-Rueda, Ferdinand C. Grozema, More Authors

Research output: Contribution to journalArticleScientificpeer-review

55 Citations (Scopus)


Formamidinium (FA) lead iodide perovskite materials feature promising photovoltaic performances and superior thermal stabilities. However, conversion of the perovskite α-FAPbI3 phase to the thermodynamically stable yet photovoltaically inactive δ-FAPbI3 phase compromises the photovoltaic performance. A strategy is presented to address this challenge by using low-dimensional hybrid perovskite materials comprising guaninium (G) organic spacer layers that act as stabilizers of the three-dimensional α-FAPbI3 phase. The underlying mode of interaction at the atomic level is unraveled by means of solid-state nuclear magnetic resonance spectroscopy, X-ray crystallography, transmission electron microscopy, molecular dynamics simulations, and DFT calculations. Low-dimensional-phase-containing hybrid FAPbI3 perovskite solar cells are obtained with improved performance and enhanced long-term stability.

Original languageEnglish
Pages (from-to)4691-4697
JournalAngewandte Chemie - International Edition
Issue number12
Publication statusPublished - 2020


  • guanine
  • hybrid perovskites
  • low-dimensional perovskites
  • perovskite solar cells
  • solid-state NMR


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