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Title: Excitons in ultrathin organic-inorganic perovskite crystals

Abstract

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.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2]
  1. Columbia Univ., New York, NY (United States)
  2. Stanford Univ., CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Re-Defining Photovoltaic Efficiency Through Molecule Scale Control (RPEMSC); Columbia Univ., New York, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1385960
Alternate Identifier(s):
OSTI ID: 1194264
Grant/Contract Number:  
SC0001085
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 92; Journal Issue: 4; Related Information: RPEMSC partners with Columbia University (lead); Brookhaven National Laboratory; Purdue University; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; solar (photovoltaic); electrodes - solar; charge transport; materials and chemistry by design; optics; synthesis (novel materials)

Citation Formats

Yaffe, Omer, Chernikov, Alexey, Norman, Zachariah M., Zhong, Yu, Velauthapillai, Ajanthkrishna, van der Zande, Arend, Owen, Jonathan S., and Heinz, Tony F. Excitons in ultrathin organic-inorganic perovskite crystals. United States: N. p., 2015. Web. doi:10.1103/PhysRevB.92.045414.
Yaffe, Omer, Chernikov, Alexey, Norman, Zachariah M., Zhong, Yu, Velauthapillai, Ajanthkrishna, van der Zande, Arend, Owen, Jonathan S., & Heinz, Tony F. Excitons in ultrathin organic-inorganic perovskite crystals. United States. doi:10.1103/PhysRevB.92.045414.
Yaffe, Omer, Chernikov, Alexey, Norman, Zachariah M., Zhong, Yu, Velauthapillai, Ajanthkrishna, van der Zande, Arend, Owen, Jonathan S., and Heinz, Tony F. Tue . "Excitons in ultrathin organic-inorganic perovskite crystals". United States. doi:10.1103/PhysRevB.92.045414. https://www.osti.gov/servlets/purl/1385960.
@article{osti_1385960,
title = {Excitons in ultrathin organic-inorganic perovskite crystals},
author = {Yaffe, Omer and Chernikov, Alexey and Norman, Zachariah M. and Zhong, Yu and Velauthapillai, Ajanthkrishna and van der Zande, Arend and Owen, Jonathan S. and Heinz, Tony F.},
abstractNote = {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.},
doi = {10.1103/PhysRevB.92.045414},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 4,
volume = 92,
place = {United States},
year = {2015},
month = {7}
}

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Cited by: 43 works
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