High photoresponse of individual WS2 nanowire-nanoflake hybrid materials

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

doi:10.1063/1.5030490

High photoresponse of individual WS₂ nanowire-nanoflake hybrid materials

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

^*Corresponding author for this work

Research output: Contribution to journal › Article › Scientific › peer-review

8 Citations (Scopus)

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.

Original language	English
Article number	233103
Journal	Applied Physics Letters
Volume	112
Issue number	23
DOIs	https://doi.org/10.1063/1.5030490
Publication status	Published - 4 Jun 2018
MoE publication type	A1 Journal article-refereed

Funding

Funding received from the Academy of Finland (Suplacat), University of Oulu (More than Moore Research Community), and University of Oulu Graduate School (Infotech Oulu) is acknowledged. We also would like to thank Sami Saukko and Esa Heinonen (Center of Microscopy and Nanotechnology, University of Oulu) for their assistance with TEM analyses and FIB processing, respectively.

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title = "High photoresponse of individual WS2 nanowire-nanoflake hybrid materials",

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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AU - Asres, Georgies Alene

AU - Järvinen, Topias

AU - Lorite, Gabriela S.

AU - Mohl, Melinda

AU - Pitkänen, Olli

AU - Dombovari, Aron

AU - Tóth, Geza

AU - Spetz, Anita Lloyd

AU - Vajtai, Robert

AU - Ajayan, Pulickel M.

AU - Lei, Sidong

AU - Talapatra, Saikat

AU - Kordas, Krisztian

PY - 2018/6/4

Y1 - 2018/6/4

N2 - 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.

AB - 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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DO - 10.1063/1.5030490

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JO - Applied Physics Letters

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High photoresponse of individual WS₂ nanowire-nanoflake hybrid materials

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