Ultra-broad spectral photo-response in FePS3 air-stable devices

Van der Waals materials with narrow energy gaps and efficient response over a broadband optical spectral range are key to widen the energy window of nanoscale optoelectronic devices. Here, we characterize FePS 3 as an appealing narrow-gap p-type semiconductor with an efficient broadband photo-respon...

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Bibliographic Details
Published in:NPJ 2D materials and applications 2021-02, Vol.5 (1), p.1-9, Article 19
Main Authors: Ramos, Maria, Carrascoso, Felix, Frisenda, Riccardo, Gant, Patricia, Mañas-Valero, Samuel, Esteras, Dorye L., Baldoví, José J., Coronado, Eugenio, Castellanos-Gomez, Andres, Calvo, M. Reyes
Format: Article
Language:English
Subjects:
639/301/1005/1007
639/301/357/1018
639/766/1130/2798
Broadband
Chemistry and Materials Science
Energy gap
Flakes
Materials Science
Nanostructure
Nanotechnology
Optoelectronic devices
P-type semiconductors
Photoelectric effect
Photoelectric emission
Prototyping
Refractivity
Spectra
Surfaces and Interfaces
Thickness
Thin Films
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Summary:Van der Waals materials with narrow energy gaps and efficient response over a broadband optical spectral range are key to widen the energy window of nanoscale optoelectronic devices. Here, we characterize FePS 3 as an appealing narrow-gap p-type semiconductor with an efficient broadband photo-response, a high refractive index, and a remarkable resilience against air and light exposure. To enable fast prototyping, we provide a straightforward guideline to determine the thickness of few-layered FePS 3 nanosheets extracted from the optical transmission characteristics of several flakes. The analysis of the electrical photo-response of FePS 3 devices as a function of the excitation energy confirms a narrow gap suitable for near IR detection (1.23 eV) and, more interestingly, reveals a broad spectral responsivity up to the ultraviolet region. The experimental estimate for the gap energy is corroborated by ab-initio calculations. An analysis of photocurrent as a function of gate voltage and incident power reveals a photo-response dominated by photogating effects. Finally, aging studies of FePS 3 nanosheets under ambient conditions show a limited reactivity of the outermost layers of flakes in long exposures to air.
ISSN:2397-7132
2397-7132
DOI:10.1038/s41699-021-00199-z