High photoresponse of individual WS₂ nanowire-nanoflake hybrid materials

Asres, Georgies Alene; Järvinen, Topias; Lorite, Gabriela S.; Mohl, Melinda; Pitkänen, Olli; Dombovari, Aron; Tóth, Geza; Lloyd Spetz, Anita; Vajtai, Robert; Ajayan, Pulickel M.; Lei, Sidong; Talapatra, Saikat; Kordas, Krisztian (2018-06-04)
 
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https://doi.org/10.1063/1.5030490

Asres, Georgies Alene
Järvinen, Topias
Lorite, Gabriela S.
Mohl, Melinda
Pitkänen, Olli
Dombovari, Aron
Tóth, Geza
Lloyd Spetz, Anita
Vajtai, Robert
Ajayan, Pulickel M.
Lei, Sidong
Talapatra, Saikat
Kordas, Krisztian
American Institute of Physics
04.06.2018

Asres, G. A., Järvinen, T., Lorite, G. S., Mohl, M., Pitkänen, O., Dombovari, A., … Kordas, K. (2018). High photoresponse of individual WS2 nanowire-nanoflake hybrid materials. Applied Physics Letters, 112(23), 233103. https://doi.org/10.1063/1.5030490

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© 2018 AIP Publishing LLC. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Applied Physics Letters 2018 112:23 and may be found at https://doi.org/10.1063/1.5030490.
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doi:https://doi.org/10.1063/1.5030490
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https://urn.fi/URN:NBN:fi-fe2019052016095
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Abstract

van der Waals solids have been recognized as highly photosensitive materials that compete conventional Si and compound semiconductor based devices. While 2-dimensional nanosheets of single and multiple layers and 1-dimensional nanowires of molybdenum and tungsten chalcogenides have been studied, their nanostructured derivatives with complex morphologies are not explored yet. Here, we report on the electrical and photosensitive properties of WS₂ nanowire-nanoflake hybrid materials we developed lately. We probe individual hybrid nanostructured particles along the structure using focused ion beam deposited Pt contacts. Further, we use conductive atomic force microscopy to analyze electrical behavior across the nanostructure in the transverse direction. The electrical measurements are complemented by in situ laser beam illumination to explore the photoresponse of the nanohybrids in the visible optical spectrum. Photodetectors with responsivity up to ∼0.4 AW⁻¹ are demonstrated outperforming graphene as well as most of the other transition metal dichalcogenide based devices.

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