Jingda Wu
;
Dongyang Yang
;
Jing Liang
;
Max Werner
;
Evgeny Ostroumov
;
Yunhuan Xiao
;
Kenji Watanabe
(National Institute for Materials Science
)
;
Takashi Taniguchi
(National Institute for Materials Science)
;
Jerry I. Dadap
;
David Jones
;
Ziliang Ye
Collection
Citation
Description:
(abstract)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:
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
Related item:
Other identifier(s):
Contact agent:
Updated at: 2025-02-23 22:46:41 +0900
Published on MDR: 2025-02-23 22:46:41 +0900
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