A Self-Powered Ultrafast Polarization-Sensitive Multifunctional Photodetector Driven by Phonon Anisotropy in a PtSe2/MoSe2 Heterostructure

A Self-Powered Ultrafast Polarization-Sensitive Multifunctional Photodetector Driven by Phonon Anisotropy in a PtSe2/MoSe2 Heterostructure | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Article A Self-Powered Ultrafast Polarization-Sensitive Multifunctional Photodetector Driven by Phonon Anisotropy in a PtSe 2 /MoSe 2 Heterostructure Mukesh kumar, Priya Rani, Rohit Dahiya, Chaitanya Auti, Pradeep Kumar This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-9038386/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract Polarization-sensitive photodetectors (PSPDs) have attracted significant interest due to their ability to detect both the polarization state and intensity of light, thereby increasing information dimensionality for compact remote sensing, imaging, and communication systems. Conventional polarization-sensitive detectors rely on external polarization optical components, resulting in bulky device structures, complex architectures, and high cost. Herein, we report a self-powered, PSPD based on a PtSe 2 /MoSe 2 van der Waals heterostructure. The semimetal/semiconductor integration enables broadband photoresponse spanning 400–1200 nm with excellent polarization sensitivity. Angle-resolved polarized Raman spectroscopy confirms that interlayer coupling arising from heterostructure formation enhances phonon vibrational anisotropy, leading to stronger optical anisotropy compared to bare PtSe 2 . A remarkable polarization ratio of ⁓38 is obtained under self-bias operation. Efficient interlayer charge transport results in ultrafast response times of 66 µs at zero bias and 6 µs under a 5 V bias. Furthermore, the photodetector delivers a self-biased responsivity of 0.74 mA W − 1 and a detectivity of 10 10 Jones. Notably, bias-tunable polarization sensitivity and wavelength-dependent anisotropy further enhance imaging and target-detection capabilities. These results highlight the promise of two-dimensional transition metal dichalcogenides (TMDC) heterostructures for next-generation multidimensional imaging and integrated optoelectronic technologies. Physical sciences/Optics and photonics/Applied optics/Optoelectronic devices and components Physical sciences/Nanoscience and technology/Nanoscale devices/Sensors Full Text Additional Declarations There is NO Competing Interest. Supplementary Files Supporting.docx SUPPLEMENTARY INFO Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-9038386","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":615975212,"identity":"69600b15-8553-4abc-89ad-925ade9c8b17","order_by":0,"name":"Mukesh 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Conventional polarization-sensitive detectors rely on external polarization optical components, resulting in bulky device structures, complex architectures, and high cost. Herein, we report a self-powered, PSPD based on a PtSe\u003csub\u003e2\u003c/sub\u003e/MoSe\u003csub\u003e2\u003c/sub\u003e van der Waals heterostructure. The semimetal/semiconductor integration enables broadband photoresponse spanning 400\u0026ndash;1200 nm with excellent polarization sensitivity. Angle-resolved polarized Raman spectroscopy confirms that interlayer coupling arising from heterostructure formation enhances phonon vibrational anisotropy, leading to stronger optical anisotropy compared to bare PtSe\u003csub\u003e2\u003c/sub\u003e. A remarkable polarization ratio of ⁓38 is obtained under self-bias operation. Efficient interlayer charge transport results in ultrafast response times of 66 \u0026micro;s at zero bias and 6 \u0026micro;s under a 5 V bias. Furthermore, the photodetector delivers a self-biased responsivity of 0.74 mA W\u003csup\u003e\u0026minus;\u0026thinsp;1\u003c/sup\u003e and a detectivity of 10\u003csup\u003e10\u003c/sup\u003e Jones. Notably, bias-tunable polarization sensitivity and wavelength-dependent anisotropy further enhance imaging and target-detection capabilities. 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