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Título: | Ultra-broad spectral photo-response in FePS3 air-stable devices |
Autor: | Ramos, María; Carrascoso Plana, Félix; Frisenda, Riccardo; Gant, Patricia; Mañas Valero, Samuel; Esteras, Dorye L.; Baldoví, José J. CSIC ORCID; Coronado, Eugenio; Castellanos-Gómez, Andrés CSIC ORCID ; Calvo, M. Reyes | Fecha de publicación: | 15-feb-2021 | Editor: | Nature Publishing Group | Citación: | npj 2D Materials and Applications 5 (2021) | Resumen: | 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 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 nanosheets extracted from the optical transmission characteristics of several flakes. The analysis of the electrical photo-response of FePS 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 nanosheets under ambient conditions show a limited reactivity of the outermost layers of flakes in long exposures to air. | Versión del editor: | http://dx.doi.org/10.1038/s41699-021-00199-z | URI: | http://hdl.handle.net/10261/280775 | DOI: | 10.1038/s41699-021-00199-z | Identificadores: | doi: 10.1038/s41699-021-00199-z e-issn: 2397-7132 |
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