Excitons in ultrathin organic-inorganic perovskite crystals

Yaffe, Omer; Chernikov, Alexey; Norman, Zachariah M.; Zhong, Yu; Velauthapillai, Ajanthkrishna; van der Zande, Arend; Owen, Jonathan S.; Heinz, Tony F.

doi:10.1103/PhysRevB.92.045414

Title: Excitons in ultrathin organic-inorganic perovskite crystals

Journal Article · Tue Jul 14 00:00:00 EDT 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.92.045414· OSTI ID:1385960

Yaffe, Omer ^[1]; Chernikov, Alexey ^[1]; Norman, Zachariah M. ^[1]; Zhong, Yu ^[1]; Velauthapillai, Ajanthkrishna ^[1]; van der Zande, Arend ^[1]; Owen, Jonathan S. ^[1]; Heinz, Tony F. ^[2]

Columbia Univ., New York, NY (United States)
Stanford Univ., CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)

In this work, we demonstrate the formation of large sheets of layered organic-inorganic perovskite (OIPC) crystals, as thin as a single unit cell, prepared by mechanical exfoliation. The resulting two-dimensional OIPC nanosheets of 2.4 nm thickness are direct semiconductors with an optical band gap of 2.4 eV. They exhibit unusually strong light-matter interaction with an optical absorption as high as 25% at the main excitonic resonance, as well as bright photoluminescence. We extract an exciton binding energy of 490 meV from measurement of the series of excited exciton states. The properties of the excitons are shown to be strongly influenced by the changes in the dielectric surroundings. The environmental sensitivity of these ultrathin OIPC sheets is further reflected in the strong suppression of a thermally driven phase transition present in the bulk crystals.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Re-Defining Photovoltaic Efficiency Through Molecule Scale Control (RPEMSC); Columbia Univ., New York, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0001085

OSTI ID:: 1385960

Alternate ID(s):: OSTI ID: 1194264

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 92, Issue 4; Related Information: RPEMSC partners with Columbia University (lead); Brookhaven National Laboratory; Purdue University; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 242 works

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Band‐Edge Exciton Fine Structure and Exciton Recombination Dynamics in Single Crystals of Layered Hybrid Perovskites Fang, Hong‐Hua; Yang, Jie; Adjokatse, Sampson Advanced Functional Materials, Vol. 30, Issue 6 https://doi.org/10.1002/adfm.201907979	journal	December 2019
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High-efficiency two-dimensional Ruddlesden–Popper perovskite solar cells Tsai, Hsinhan; Nie, Wanyi; Blancon, Jean-Christophe Nature, Vol. 536, Issue 7616 https://doi.org/10.1038/nature18306	journal	July 2016
Polaritons in layered two-dimensional materials Low, Tony; Chaves, Andrey; Caldwell, Joshua D. Nature Materials, Vol. 16, Issue 2 https://doi.org/10.1038/nmat4792	journal	November 2016
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Energy transfer mechanisms in layered 2D perovskites A. M., Moran,; L., Yan,; O. F., Williams, The University of North Carolina at Chapel Hill University Libraries https://doi.org/10.17615/2br4-r293	text	January 2018
Phonon coherences reveal the polaronic character of excitons in two-dimensional lead halide perovskites Srimath Kandada, Ajay Ram; Thouin, Felix; Valverde-Chavez, David Proceedings of the 1st Interfaces in Organic and Hybrid Thin-Film Optoelectronics https://doi.org/10.29363/nanoge.inform.2019.051	conference	January 2019
Ultrathin Two-Dimensional Organic-Inorganic Hybrid Perovskite Nanosheets with Bright, Tunable Photoluminescence and High Stability Yang, Shuang; Niu, Wenxin; Wang, An-Liang Angewandte Chemie International Edition, Vol. 56, Issue 15 https://doi.org/10.1002/anie.201701134	journal	March 2017
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Exciton-polaron spectral structures in two dimensional hybrid lead-halide perovskites Neutzner, Stefanie; Thouin, Félix; Cortecchia, Daniele arXiv https://doi.org/10.48550/arxiv.1803.02455	text	January 2018
Band-edge Exciton Fine Structure and Exciton Recombination Dynamics in Single crystals of Layered Hybrid Perovskites Fang, Hong-Hua; Yang, Jie; Adjokatse, Sampson arXiv https://doi.org/10.48550/arxiv.1909.11589	preprint	January 2019
Long-Term Stabilization of Two-Dimensional Perovskites by Encapsulation with Hexagonal Boron Nitride Seitz, Michael; Gant, Patricia; Castellanos-Gomez, Andres arXiv https://doi.org/10.48550/arxiv.2009.10996	text	January 2020

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