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Ultrafast dynamics of the surface photovoltage in potassium-doped black phosphorus


Kremer, Geoffroy; Rumo, Maxime; Yue, Changming; Pulkkinen, Aki; Nicholson, Christopher W; Jaouen, Thomas; von Rohr, Fabian O; Werner, Philipp; Monney, Claude (2021). Ultrafast dynamics of the surface photovoltage in potassium-doped black phosphorus. Physical review B, 104(3):035125.

Abstract

Black phosphorus is a quasi-two-dimensional layered semiconductor with a narrow direct band gap of 0.3 eV. A giant surface Stark effect can be produced by the potassium doping of black phosphorus, leading to a semiconductor to semimetal phase transition originating from the creation of a strong surface dipole and associated band bending. By using time- and angle-resolved photoemission spectroscopy, we report the partial photoinduced screening of this band bending by the creation of a compensating surface photovoltage. We further resolve the detailed dynamics of this effect at the pertinent timescales and the related evolution of the band structure near the Fermi level. We demonstrate that after a fast rise time, the surface photovoltage exhibits a plateau over a few tens of picoseconds before decaying on the nanosecond timescale. We support our experimental results with simulations based on drift-diffusion equations.

Abstract

Black phosphorus is a quasi-two-dimensional layered semiconductor with a narrow direct band gap of 0.3 eV. A giant surface Stark effect can be produced by the potassium doping of black phosphorus, leading to a semiconductor to semimetal phase transition originating from the creation of a strong surface dipole and associated band bending. By using time- and angle-resolved photoemission spectroscopy, we report the partial photoinduced screening of this band bending by the creation of a compensating surface photovoltage. We further resolve the detailed dynamics of this effect at the pertinent timescales and the related evolution of the band structure near the Fermi level. We demonstrate that after a fast rise time, the surface photovoltage exhibits a plateau over a few tens of picoseconds before decaying on the nanosecond timescale. We support our experimental results with simulations based on drift-diffusion equations.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Department of Chemistry
Dewey Decimal Classification:540 Chemistry
Scopus Subject Areas:Physical Sciences > Electronic, Optical and Magnetic Materials
Physical Sciences > Condensed Matter Physics
Language:English
Date:12 July 2021
Deposited On:09 Feb 2022 08:04
Last Modified:26 Feb 2024 02:47
Publisher:American Physical Society
ISSN:2469-9950
OA Status:Green
Publisher DOI:https://doi.org/10.1103/physrevb.104.035125
Project Information:
  • : FunderSNSF
  • : Grant IDPP00P2_170597
  • : Project TitleInvestigating the ultrafast dynamics of Mott correlations
  • : FunderH2020
  • : Grant ID724103
  • : Project TitleMODMAT - Nonequilibrium dynamical mean-field theory: From models to materials
  • : FunderSNSF
  • : Grant ID200021-19696
  • : Project Title
  • : FunderSNSF
  • : Grant ID200021-165539
  • : Project Title
  • Content: Accepted Version