Scaling law for excitons in 2D perovskite quantum wells

J. C. Blancon; A. V. Stier; H. Tsai; W. Nie; C. C. Stoumpos; B. Traoré; L. Pedesseau; M. Kepenekian; F. Katsutani; G. T. Noe; J. Kono; S. Tretiak; S. A. Crooker; C. Katan; M. G. Kanatzidis; J. J. Crochet; J. Even; A. D. Mohite

doi:10.1038/s41467-018-04659-x

Scaling law for excitons in 2D perovskite quantum wells

J. C. Blancon, A. V. Stier, H. Tsai, W. Nie, C. C. Stoumpos, B. Traoré, L. Pedesseau, M. Kepenekian, F. Katsutani, G. T. Noe, J. Kono, S. Tretiak, S. A. Crooker, C. Katan, M. G. Kanatzidis, J. J. Crochet, J. Even, A. D. Mohite

Northwestern University

Research output: Contribution to journal › Article

116 Citations (Scopus)

Abstract

Ruddlesden-Popper halide perovskites are 2D solution-processed quantum wells with a general formula A₂A' _n-1M _n X_3n+1, where optoelectronic properties can be tuned by varying the perovskite layer thickness (n-value), and have recently emerged as efficient semiconductors with technologically relevant stability. However, fundamental questions concerning the nature of optical resonances (excitons or free carriers) and the exciton reduced mass, and their scaling with quantum well thickness, which are critical for designing efficient optoelectronic devices, remain unresolved. Here, using optical spectroscopy and 60-Tesla magneto-absorption supported by modeling, we unambiguously demonstrate that the optical resonances arise from tightly bound excitons with both exciton reduced masses and binding energies decreasing, respectively, from 0.221 m ₀ to 0.186 m ₀ and from 470 meV to 125 meV with increasing thickness from n equals 1 to 5. Based on this study we propose a general scaling law to determine the binding energy of excitons in perovskite quantum wells of any layer thickness.

Original language	English
Article number	2254
Journal	Nature communications
Volume	9
Issue number	1
DOIs	https://doi.org/10.1038/s41467-018-04659-x
Publication status	Published - Dec 1 2018

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ASJC Scopus subject areas

Chemistry(all)
Biochemistry, Genetics and Molecular Biology(all)
Physics and Astronomy(all)

Cite this

Blancon, J. C., Stier, A. V., Tsai, H., Nie, W., Stoumpos, C. C., Traoré, B., Pedesseau, L., Kepenekian, M., Katsutani, F., Noe, G. T., Kono, J., Tretiak, S., Crooker, S. A., Katan, C., Kanatzidis, M. G., Crochet, J. J., Even, J., & Mohite, A. D. (2018). Scaling law for excitons in 2D perovskite quantum wells. Nature communications, 9(1), [2254]. https://doi.org/10.1038/s41467-018-04659-x

Scaling law for excitons in 2D perovskite quantum wells. / Blancon, J. C.; Stier, A. V.; Tsai, H.; Nie, W.; Stoumpos, C. C.; Traoré, B.; Pedesseau, L.; Kepenekian, M.; Katsutani, F.; Noe, G. T.; Kono, J.; Tretiak, S.; Crooker, S. A.; Katan, C.; Kanatzidis, M. G.; Crochet, J. J.; Even, J.; Mohite, A. D.

In: Nature communications, Vol. 9, No. 1, 2254, 01.12.2018.

Research output: Contribution to journal › Article

Blancon, J. C. ; Stier, A. V. ; Tsai, H. ; Nie, W. ; Stoumpos, C. C. ; Traoré, B. ; Pedesseau, L. ; Kepenekian, M. ; Katsutani, F. ; Noe, G. T. ; Kono, J. ; Tretiak, S. ; Crooker, S. A. ; Katan, C. ; Kanatzidis, M. G. ; Crochet, J. J. ; Even, J. ; Mohite, A. D. / Scaling law for excitons in 2D perovskite quantum wells. In: Nature communications. 2018 ; Vol. 9, No. 1.

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AU - Traoré, B.

AU - Pedesseau, L.

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AU - Katan, C.

AU - Kanatzidis, M. G.

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AU - Even, J.

AU - Mohite, A. D.

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10.1038/s41467-018-04659-x