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arXiv:1811.07638 (cond-mat)
[Submitted on 19 Nov 2018]

Title:Broadband Defects Emission and Enhanced Ligand Raman Scattering in 0D Cs3Bi2I9 Colloidal Nanocrystals

Authors:Giuseppe M. Paterno', Nimai Mishra, Alex J. Barker, Zhiya Dang, Guglielmo Lanzani, Liberato Manna, Annamaria Petrozza
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Abstract:Excitonic 0D and 2D lead-halide perovskites have been recently developed and investigated as new materials for light generation. Here we report broadband (> 1 eV) emission from newly synthesised zero-dimensional (0D) lead-free colloidal Cs3Bi2I9 nanocrystals. We investigate the nature of their emissive states as well as the relative dynamics which are currently hotly debated. In particular, we find that the broadband emission is made by the coexistence of emissive excitons and sub-bandgap emissive trap-states. Remarkably, we observe evidence of enhanced Raman scattering from the ligands when attached to the nanocrystals surface, an effect that we preliminary attribute to strong exciton-ligands electronic coupling in these systems.
Subjects: Materials Science (cond-mat.mtrl-sci)
Cite as: arXiv:1811.07638 [cond-mat.mtrl-sci]
  (or arXiv:1811.07638v1 [cond-mat.mtrl-sci] for this version)
  https://doi.org/10.48550/arXiv.1811.07638
Related DOI: https://doi.org/10.1002/adfm.201805299

Submission history

From: Giuseppe Maria Paternò [view email]
[v1] Mon, 19 Nov 2018 12:15:31 UTC (1,209 KB)
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