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Journal Articles Nature Communications Year : 2018

Scaling law for excitons in 2D perovskite quantum wells

Jean-Christophe Blancon
  • Function : Correspondent author
  • PersonId : 769742
  • IdRef : 186376200
Andreas Stier
Boubacar Traore
Sergei Tretiak
C. Katan

Abstract

Ruddlesden-Popper halide perovskites are 2D solution-processed quantum wells with a general formula AA'M X, 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 to 0.186 m 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.
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Dates and versions

hal-01811274 , version 1 (12-07-2019)

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Jean-Christophe Blancon, Andreas Stier, Hsinhan Tsai, Wanyi Nie, Constantinos C Stoumpos, et al.. Scaling law for excitons in 2D perovskite quantum wells. Nature Communications, 2018, 9 (1), pp.2254. ⟨10.1038/s41467-018-04659-x⟩. ⟨hal-01811274⟩
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