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

Research output: Contribution to journalArticlepeer-review

739 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; and these drive an increased formation energy and should therefore improve material stability. Here we report the 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 achieved 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 - Feb 17 2016

Fingerprint

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

Cite this