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

    Research output: Contribution to journalArticlepeer-review

    6 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 languageEnglish
    Article number233103
    JournalApplied Physics Letters
    Volume112
    Issue number23
    DOIs
    Publication statusPublished - 4 Jun 2018
    MoE publication typeA1 Journal article-refereed

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