Field-modulated quantum dot solids enable exceptional gain–bandwidth product of infrared photodetector

Field-modulated quantum dot solids enable exceptional gain–bandwidth product of infrared photodetector | 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 Field-modulated quantum dot solids enable exceptional gain–bandwidth product of infrared photodetector Se-Woong Baek, Seo Young Lee, Min-Jae Si, Dongeon Kim, Benjamin Rehl, and 9 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-6492192/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 Solution-processed shortwave infrared (SWIR) photodetectors are crucial for a wide range of applications, including autonomous systems and quantum technologies. To meet the demands of these applications, achieving both high gain and high bandwidth at 1550 nm—comparable to that of commercial InGaAs photodetectors—is essential. In this study, we present a universal strategy for enhancing gain in photodiode structures via carrier multiplication. We employ solution-processed heterogeneous colloidal quantum dot (CQD) solids to tailor the internal electric field distribution within the device. Notably, by harnessing quantum confinement effects, we demonstrated the localized electric field concentration that facilitates efficient carrier multiplication. The resultant CQD photodetector yields an exceptionally high gain exceeding 3000 at an operating voltage of approximately − 7.6 V, along with a record-high gain–bandwidth product of 72.7 GHz among all previously reported solution-processed infrared photodetectors. Physical sciences/Nanoscience and technology/Nanoscale devices Physical sciences/Materials science/Materials for devices/Sensors and biosensors Physical sciences/Chemistry/Physical chemistry Colloidal quantum dot (CQD) Photodetector Shortwave Infrared Solution-processed Electric-field modulation Full Text Additional Declarations There is NO Competing Interest. Supplementary Files CQDAPDSINatureformattingphotonics.docx Supporting information 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. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. 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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-6492192","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":455825875,"identity":"91aaea85-ffbc-4136-8828-ebc7f7763812","order_by":0,"name":"Se-Woong 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To meet the demands of these applications, achieving both high gain and high bandwidth at 1550 nm\u0026mdash;comparable to that of commercial InGaAs photodetectors\u0026mdash;is essential. In this study, we present a universal strategy for enhancing gain in photodiode structures via carrier multiplication. We employ solution-processed heterogeneous colloidal quantum dot (CQD) solids to tailor the internal electric field distribution within the device. Notably, by harnessing quantum confinement effects, we demonstrated the localized electric field concentration that facilitates efficient carrier multiplication. 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