Journal Article

FZJ-2023-02296

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Unconventional conductivity increase in multilayer black phosphorus

Koleśnik-Gray, M. (Corresponding author) ; Meingast, L. ; Siebert, M. ; Unbehaun, T. ; Huf, T. ; Ellrott, G. ; Abellán, G. ; Wild, S. ; Lloret, V. ; Mundloch, U. ; Schwarz, J. ; Niebauer, M. ; Szabo, M. ; Rommel, M. ; Hutzler, A.FZJ* ; Hauke, F. ; Hirsch, A. ; Krstić, V. (Corresponding author)

2023
Nature Publishing Group London

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Please use a persistent id in citations: http://hdl.handle.net/2128/34530  doi:10.1038/s41699-023-00384-2

Abstract: Multilayers of so-called 2D van der Waals materials have gained considerable attention as active components of next-generation electronic and optoelectronic technologies, with semiconducting black phosphorus (BP) regarded as one of the most promising systems. The applicability and performance limits of BP in both stand-alone and heterostructure-based multilayer devices are determined by individual flake charge transport properties, which synergistically depend on the number of layers and the strength of interlayer coupling between those. In this work, we study the DC electrical transport characteristics of high-quality BP field-effect devices within a wide range of flake thicknesses at room temperature. The experimental data show a non-trivial increase in conductivity and hole density with a reduced number of layers while maintaining constant field-effect mobility due to the prevalence of electron–phonon scattering. Based on the solution of the 1D Schrödinger–Poisson equation, we find that the observed phenomena are a direct consequence of non-negligible interlayer coupling, which in turn causes a local redistribution of free charge carriers towards the central layers. Our data show that due to the electrostatic conditions at the flake surfaces, a naturally protected 2D hole gas can be encapsulated in flakes as high as 10 nm, which preserves the bulk-like bandgap and effective carrier masses due to the electrostatic environment.

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Contributing Institute(s):

1. Helmholtz-Institut Erlangen-Nürnberg Erneuerbare Energien (IEK-11)

Research Program(s):

1. 1232 - Power-based Fuels and Chemicals (POF4-123) (POF4-123)
2. DFG project 454726051 - Elektronische Bauelemente auf Basis des 2D-Materials schwarzer Phosphor - lagenanzahlabhängige Eigenschaften (454726051) (454726051)

Appears in the scientific report 2023

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Database coverage:
; ; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DOAJ Seal ; IF >= 5 ; JCR ; SCOPUS ; Web of Science Core Collection

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