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
  • , Marco A. Ruiz-Preciado
  • , Amita Ummadisingu
  • , Yuhang Liu
  • , Chengbo Tian
  • , Linfeng Pan
  • , Shaik M. Zakeeruddin
  • , Anders Hagfeldt
  • , Ferdinand C. Grozema
  • , Ursula Rothlisberger
  • , Lyndon Emsley
  • , Hongwei Han
  • , Michael Graetzel

Research output: Contribution to journalArticlepeer-review

69 Scopus citations

Abstract

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
Number of pages7
JournalAngewandte Chemie - International Edition
Volume59
Issue number12
DOIs
StatePublished - 16 Mar 2020
Externally publishedYes

Keywords

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

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