Suppressing X-Migrations and Enhancing the Phase Stability of Cubic FAPbX3 (X = Br, I)

Aleksandra Oranskaia, Udo Schwingenschlögl

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Chemical bonding of formamidinium (FA) with the inorganic perovskite skeleton of FAPbX3 (X = Br, I) is studied with emphasis on the differences to methylammonium: stronger hydrogen bonding, the presence of π-anion bonding, and more sterically hindered motion inside the perovskite inorganic cage. Organic cation dopants fitting in the perovskite cubic cell and being capable of hydrogen and halogen bonding with overall doubled bonding strength as compared to FA are proposed. They are shown to suppress not only X-migrations but also the undesirable α–δ phase transition of FAPbI3. In addition, a possible atomistic explanation of the champion solar cell efficiency achieved experimentally is developed.
Original languageEnglish (US)
Pages (from-to)1901411
JournalAdvanced Energy Materials
Volume9
Issue number32
DOIs
StatePublished - Jul 24 2019

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