Neutral and Charged Exciton Fine Structure in Single Lead Halide Perovskite Nanocrystals Revealed by Magneto-optical Spectroscopy

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Author(s)

  • Ming Fu
  • Philippe Tamarat
  • Jacky Even
  • Brahim Lounis

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)2895-2901
Journal / PublicationNano Letters
Volume17
Issue number5
Publication statusPublished - 10 May 2017

Abstract

Revealing the crystal structure of lead halide perovskite nanocrystals is essential for the optimization of stability of these emerging materials in applications such as solar cells, photodetectors, and light-emitting devices. We use magneto-photoluminescence spectroscopy of individual perovskite CsPbBr3 nanocrystals as a unique tool to determine their crystal structure, which imprints distinct signatures in the excitonic sublevels of charge complexes at low temperatures. At zero magnetic field, the identification of two classes of photoluminescence spectra, displaying either two or three sublevels in their exciton fine structure, shows evidence for the existence of two crystalline structures, namely tetragonal D4h and orthorhombic D2h phases. Magnetic field shifts, splitting, and coupling of the sublevels provide a determination of the diamagnetic coefficient and valuable information on the exciton g-factor and its anisotropic character. Moreover, this spectroscopic study reveals the optical properties of charged excitons and allows the extraction of the electron and hole g-factors for perovskite systems.

Research Area(s)

  • band-edge fine structure, exciton, Lead halide perovskite, magneto-optical spectroscopy, single nanocrystals, trion

Citation Format(s)

Neutral and Charged Exciton Fine Structure in Single Lead Halide Perovskite Nanocrystals Revealed by Magneto-optical Spectroscopy. / Fu, Ming; Tamarat, Philippe; HUANG, He; Even, Jacky; Rogach, Andrey L.; Lounis, Brahim.

In: Nano Letters, Vol. 17, No. 5, 10.05.2017, p. 2895-2901.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review