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Ferroelectric 3R-MoS2 has been shown to exhibit spontaneous polarization down to bilayer, and can sustain a strong depolarization field when sandwiched between graphene electrodes. This property gives rise to highly efficient photovoltaic-current generation without needing heterostructures or p-n junctions. In this work, we study the photovoltaic-current dynamics in 3R-MoS2 photodetectors and identify a strong thermal saturation of the photocurrent upon ultrafast laser heating. In addition, we developed a photocurrent cross-correlation technique to deconvolute the thermal saturation and charge-transfer processes, revealing the multi-component nature of the photocurrent dynamics. The fastest component approaches the limit of charge transfer dynamics at the graphene-MoS2 interface. This work demonstrates a novel method to study ultrafast photocurrent speed, and supports the use of ferroelectric van der Waals materials for future high-performance optoelectronic applications.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: 3R-MoS2, Spontaneous polarization, photovoltaic effect

Date published: 2022-12-16

Publisher: American Association for the Advancement of Science (AAAS)

Journal:

• Science Advances (ISSN: 23752548) vol. 8 issue. 50 eade3759

Funding:

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1126/sciadv.ade3759

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Updated at: 2025-02-23 22:46:41 +0900

Published on MDR: 2025-02-23 22:46:41 +0900