Nanoscale geometrical patterning for junctionless thermoelectrics

Nanoscale geometrical patterning for junctionless thermoelectrics | Research Square 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 Help Center Sign In Submit a Preprint Cite Share Download PDF Article Nanoscale geometrical patterning for junctionless thermoelectrics Sergio Gonzalez-Munoz, Peng Xiao, Charalambos Evangeli, Eli Castanon, and 9 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-8885712/v1 This work is licensed under a CC BY 4.0 License Status: Under Review Version 1 posted You are reading this latest preprint version Abstract Classical thermoelectric (TE) phenomena require a junction between two dissimilar materials with different Seebeck coefficients to either generate current via temperature differences at the junctions (Seebeck effect) or to cool/heat these junctions by applying external current (Peltier effect). While modifying the Seebeck coefficient via material composition and heterostructuring using different materials is well known, changing the Seebeck coefficient of a uniform material just by geometrical patterning was neither known, nor foreseen. Here, we report, for the first time, the ability to engineer the Seebeck coefficient, the dominant parameter of TE performance, in an arbitrary large area of a single uniform two-dimensional (2D) material by geometrical patterning. The Seebeck coefficient modification decays in an exponential manner, over a characteristic “decay length”, dTE ~ 1 μm, that we link to the product of Fermi velocity of the charge carriers and the time of phonon-electron energy exchange in a 2D material. By constructing nanopatterns of voids with pitch smaller than dTE, we effectively create TE “junctions”, opening up novel avenues for thermal management in nanoelectronics, photodetector arrays and TE energy generation. Physical sciences/Nanoscience and technology/Nanoscale materials/Two-dimensional materials Physical sciences/Energy science and technology/Thermoelectric devices and materials Physical sciences/Physics/Techniques and instrumentation/Microscopy/Scanning probe microscopy Physical sciences/Nanoscience and technology/Nanoscale devices/Electronic devices Physical sciences/Materials science/Materials for devices/Electronic devices Full Text Additional Declarations There is NO Competing Interest. Supplementary Files SupportingInformation.docx Supporting Information Cite Share Download PDF Status: Under Review 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. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. Also discoverable on Platform About Our Team In Review Editorial Policies 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

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