Ligand-Stabilized Reduced-Dimensionality Perovskites

Li Na Quan, Mingjian Yuan, Riccardo Comin, Oleksandr Voznyy, Eric M. Beauregard, Sjoerd Hoogland, Andrei Buin, Ahmad R. Kirmani, Kui Zhao, Aram Amassian, Dong Ha Kim*, Edward H. Sargent

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1143 Scopus citations

Abstract

Metal halide perovskites have rapidly advanced thin-film photovoltaic performance; as a result, the materials' observed instabilities urgently require a solution. Using density functional theory (DFT), we show that a low energy of formation, exacerbated in the presence of humidity, explains the propensity of perovskites to decompose back into their precursors. We find, also using DFT, that intercalation of phenylethylammonium between perovskite layers introduces quantitatively appreciable van der Waals interactions. These drive an increased formation energy and should therefore improve material stability. Here we report reduced-dimensionality (quasi-2D) perovskite films that exhibit improved stability while retaining the high performance of conventional three-dimensional perovskites. Continuous tuning of the dimensionality, as assessed using photophysical studies, is achieved by the choice of stoichiometry in materials synthesis. We achieve the first certified hysteresis-free solar power conversion in a planar perovskite solar cell, obtaining a 15.3% certified PCE, and observe greatly improved performance longevity.

Original languageEnglish (US)
Pages (from-to)2649-2655
Number of pages7
JournalJournal of the American Chemical Society
Volume138
Issue number8
DOIs
StatePublished - Mar 2 2016

ASJC Scopus subject areas

  • General Chemistry
  • Biochemistry
  • Catalysis
  • Colloid and Surface Chemistry

Fingerprint

Dive into the research topics of 'Ligand-Stabilized Reduced-Dimensionality Perovskites'. Together they form a unique fingerprint.

Cite this