Visible Out-of-plane Polarized Luminescence and Electronic Resonance in Black Phosphorus

Black phosphorus (BP) is unique among layered materials because of its homonuclear lattice and strong structural anisotropy. While recent investigations on few-layer BP have extensively explored the in-plane (a, c) anisotropy, much less attention has been given to the out-of-plane direction (b). Her...

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Published in:Nano letters Vol. 22; no. 7; pp. 2851 - 2858
Main Authors: Schué, Léonard, Goudreault, Félix A, Righi, Ariete, Resende, Geovani C, Lefebvre, Valérie, Godbout, Émile, Tie, Monique, Ribeiro, Henrique B, Heinz, Tony F, Pimenta, Marcos A, Côté, Michel, Francœur, Sébastien, Martel, Richard
Format: Journal Article
Language:English
Published: United States American Chemical Society 13.04.2022
Subjects:
Black phosphorus
MATERIALS SCIENCE
optical anisotropy
out-of-plane polarization
resonant Raman
visible luminescence
visible luminescence
resonant Raman
out-of-plane polarization
optical anisotropy
Black phosphorus
ISSN:1530-6984, 1530-6992, 1530-6992
Online Access:Get full text
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Summary:Black phosphorus (BP) is unique among layered materials because of its homonuclear lattice and strong structural anisotropy. While recent investigations on few-layer BP have extensively explored the in-plane (a, c) anisotropy, much less attention has been given to the out-of-plane direction (b). Here, the optical response from bulk BP is probed using polarization-resolved photoluminescence (PL), photoluminescence excitation (PLE), and resonant Raman scattering along the zigzag, out-of-plane, and armchair directions. An unexpected b-polarized luminescence emission is detected in the visible, far above the fundamental gap. PLE indicates that this emission is generated through b-polarized excitation at 2.3 eV. The same electronic resonance is observed in resonant Raman with the enhancement of the Ag phonon modes scattering efficiency. These experimental results are fully consistent with DFT calculations of the permittivity tensor elements and demonstrate the remarkable extent to which the anisotropy influences the optical properties and carrier dynamics in black phosphorus.
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Natural Sciences and Engineering Research Council of Canada (NSERC)
CNPq
and Brazilian Institute of Science and Technology in Carbon Nanomaterials (INCT)-Nanocarbono
USDOE Office of Science (SC), Basic Energy Sciences (BES)
AC02-76SF00515'; 2018/04926-9; NETGP 508526-17; RGPAS-2019-00050; RGPIN-2016-06666; RGPIN-2019-06545
FINEP
FAPEMIG
CAPES
ISSN:1530-6984
1530-6992
1530-6992
DOI:10.1021/acs.nanolett.1c04998