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Cited by 2,085

The DOI matches its Crossref record; 32 of the 32 references it cites were found in a registry or an index.

Direct measurement of the exciton binding energy and effective masses for charge carriers in organic–inorganic tri-halide perovskites

Open access
Miyata, Atsuhiko, Mitioglu, Anatolie, Plochocka, Paulina, Portugall, Oliver, Wang, Jacob Tse-Wei, Stranks, Samuel D., Snaith, Henry J., Nicholas, Robin J.·2015·Nature Physics
DOI 10.1038/nphys3357
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Abstract

Solar cells based on the organic–inorganic tri-halide perovskite family of materials have shown significant progress recently, offering the prospect of low-cost solar energy from devices that are very simple to process. Fundamental to understanding the operation of these devices is the exciton binding energy, which has proved both difficult to measure directly and controversial. We demonstrate that by using very high magnetic fields it is possible to make an accurate and direct spectroscopic measurement of the exciton binding energy, which we find to be only 16 meV at low temperatures, over three times smaller than has been previously assumed. In the room-temperature phase we show that the binding energy falls to even smaller values of only a few millielectronvolts, which explains their excellent device performance as being due to spontaneous free-carrier generation following light absorption. Additionally, we determine the excitonic reduced effective mass to be 0.104me (where me is the electron mass), significantly smaller than previously estimated experimentally but in good agreement with recent calculations. Our work provides crucial information about the photophysics of these materials, which will in turn allow improved optoelectronic device operation and better understanding of their electronic properties. Direct measurement of the exciton binding energy shows that the impressive performance of perovskite solar cells arises from the spontaneous generation of free electrons and holes after light absorption.

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Metadata

Authors
Miyata, A., Mitioglu, A., Plochocka, P., Portugall, O., Wang, J. T.-W., Stranks, S. D., Snaith, H. J., & Nicholas, R. J.
Venue
Nature Physics
Publisher
Springer Science and Business Media LLC
Published
2015-06-15
Volume
11
Issue
7
Pages
582-587
ISSN
  • 1745-2473 (ISSN-L)
  • 1745-2481
DOI
10.1038/nphys3357
OpenAlex
W1696825759
Cited by
2,085
References
32
FWCI
92.06
Type
journal article
Language
en
Open access
green

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