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Ligand-Stabilized Reduced-Dimensionality Perovskites

Title
Ligand-Stabilized Reduced-Dimensionality Perovskites
Authors
Quan, Li NaYuan, MingjianComin, RiccardoVoznyy, OleksandrBeauregard, Eric M.Hoogland, SjoerdBuin, AndreiKirmani, Ahmad R.Zhao, KuiAmassian, AramKim, Dong HaSargent, Edward H.
Ewha Authors
김동하
SCOPUS Author ID
김동하scopus
Issue Date
2016
Journal Title
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
ISSN
0002-7863JCR Link
Citation
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY vol. 138, no. 8, pp. 2649 - 2655
Publisher
AMER CHEMICAL SOC
Indexed
SCIE; SCOPUS WOS scopus
Document Type
Article
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.
DOI
10.1021/jacs.5b11740
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자연과학대학 > 화학·나노과학전공 > Journal papers
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