Ultrafast reversible photoconductivity in 2D MoTe<sub>2</sub>/Pt van der Waals heterostructure.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40938985.
- Also identified by DOI 10.1126/sciadv.ady1321 and PMC identifier 12429035.
- Licence recorded as CC BY-NC.
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Abstract
Two-dimensional (2D) materials, particularly transition metal dichalcogenides, have exceptional optoelectronic properties, making them highly promising for next-generation photonic integrated circuits. Despite great advancements in 2D optoelectronic devices, achieving ultrafast and controllable photoconductivity polarity inversion with a single device remains a fundamental challenge due to the static nature of built-in electric fields at metal/2D material interfaces. This study demonstrates a transient electric field reversal at the MoTe<sub>2</sub>/Pt Schottky junction, enabling photoconductivity inversion from negative to positive within 100 ps. By applying ultrafast photocurrent detection, a minimal voltage variation (10 mV) precisely controls this transition, and a device with a remarkable photocurrent response time of 3.8 ps is proposed. This work advances the design of ultrafast, tunable photodetectors, offering potential applications in high-speed optical communication, ultrafast imaging, and quantum information processing.