Aniello Pelella, Kimberly Intonti, Ofelia Durante, Arun Kumar, Loredana Viscardi, Sebastiano De Stefano, Paola Romano, Filippo Giubileo, Hazel Neill, Vilas Patil, Lida Ansari, Brendan Roycroft, Paul K Hurley, Farzan Gity, Antonio Di Bartolomeo
{"title":"Multilayer WS<sub>2</sub> for low-power visible and near-infrared phototransistors.","authors":"Aniello Pelella, Kimberly Intonti, Ofelia Durante, Arun Kumar, Loredana Viscardi, Sebastiano De Stefano, Paola Romano, Filippo Giubileo, Hazel Neill, Vilas Patil, Lida Ansari, Brendan Roycroft, Paul K Hurley, Farzan Gity, Antonio Di Bartolomeo","doi":"10.1186/s11671-024-04000-0","DOIUrl":null,"url":null,"abstract":"<p><p>Mechanically exfoliated multilayer WS<sub>2</sub> flakes are used as the channel of field effect transistors for low-power photodetection in the visible and near-infrared (NIR) spectral range. The electrical characterization as a function of the temperature reveals devices with n-type conduction and slightly different Schottky barriers at the drain and source contacts. The WS<sub>2</sub> phototransistors can be operated in self-powered mode, yielding both a current and a voltage when exposed to light. The spectral photoresponse in the visible and the NIR ranges shows a high responsivity (4.5 μA/W) around 1250 nm, making the devices promising for telecommunication applications.</p>","PeriodicalId":72828,"journal":{"name":"Discover nano","volume":"19 1","pages":"57"},"PeriodicalIF":0.0000,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10963712/pdf/","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Discover nano","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1186/s11671-024-04000-0","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"0","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
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Abstract
Mechanically exfoliated multilayer WS2 flakes are used as the channel of field effect transistors for low-power photodetection in the visible and near-infrared (NIR) spectral range. The electrical characterization as a function of the temperature reveals devices with n-type conduction and slightly different Schottky barriers at the drain and source contacts. The WS2 phototransistors can be operated in self-powered mode, yielding both a current and a voltage when exposed to light. The spectral photoresponse in the visible and the NIR ranges shows a high responsivity (4.5 μA/W) around 1250 nm, making the devices promising for telecommunication applications.
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