Stabilization of the Metastable Lead Iodide Perovskite Phase via Surface Functionalization

Fu, Yongping; Wu, Tao; Wang, Jue; Zhai, Jianyuan; Shearer, Melinda J.; Zhao, Yuzhou; Hamers, Robert J.; Kan, Erjun; Deng, Kaiming; Zhu, X. -Y.; Jin, Song

doi:10.1021/acs.nanolett.7b01500

Title: Stabilization of the Metastable Lead Iodide Perovskite Phase via Surface Functionalization

Journal Article · Tue Jun 13 00:00:00 EDT 2017 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.7b01500· OSTI ID:1474062

^[1]; Wu, Tao ^[2]; Wang, Jue ^[3]; Zhai, Jianyuan ^[1];

^[1]; Zhao, Yuzhou ^[1];

^[1];

^[2]; Deng, Kaiming ^[2];

^[3];

^[1]

Univ. of Wisconsin, Madison, WI (United States). Dept. of Chemistry
Nanjing Univ. of Technology (China). Dept. of Applied Physics
Columbia Univ., New York, NY (United States). Dept. of Chemistry

Metastable structural polymorphs can have superior properties and applications to their thermodynamically stable phases, but the rational synthesis of metastable phases is a challenge. Here in this paper, a new strategy for stabilizing metastable phases using surface functionalization is demonstrated using the example of formamidinium lead iodide (FAPbI₃) perovskite, which is metastable at room temperature (RT) but holds great promises in solar and light-emitting applications. We show that, through surface ligand functionalization during direct solution growth at RT, pure FAPbI₃ in the cubic perovskite phase can be stabilized in nanostructures and thin films at RT without cation or anion alloying. Surface characterizations reveal that long-chain alkyl or aromatic ammonium (LA) cations bind to the surface of perovskite structure. Calculations show that such functionalization reduces the surface energy and plays a dominant role in stabilizing the metastable perovskite phase. Excellent photophysics and optically pumped lasing from the stabilized single-crystal FAPbI₃ nanoplates with low thresholds were demonstrated. High-performance solar cells can be fabricated with such directly synthesized stabilized phase-pure FAPbI3 with a lower bandgap. Our results offer new insights on the surface chemistry of perovskite materials and provide a new strategy for stabilizing metastable perovskites and metastable polymorphs of solid materials in general.

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Research Organization:: Columbia Univ., New York, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: SC0010692

OSTI ID:: 1474062

Journal Information:: Nano Letters, Vol. 17, Issue 7; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 169 works

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36 MATERIALS SCIENCE
14 SOLAR ENERGY
25 ENERGY STORAGE
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lead halide perovskites
Metastable polymorphs
nanolasers
perovskite photovoltaics
photophysics
surface functionalization

Title: Stabilization of the Metastable Lead Iodide Perovskite Phase via Surface Functionalization

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