Manipulating thermal and electronic transports in thermoelectric Bi2Te3 nanowires by porphyrin adsorption
Source abstract
Abstract
Decoupling the electronic thermal and electrical conductivities is one of the limitations hindering a breakthrough in thermoelectric efficiency. After a conformal surface coating of bismuth telluride nanowires (Bi2Te3 NWs) by porphyrins, the thermal conductivity increases from 0.8 to 1.0 Wm-1K-1 at 300 K without any obvious change in electrical conductivity. Density Functional Theory (DFT) calculations assisted by Boltzmann Transport Equation (BTE) simulations of electronic transport properties indicate that the electronic thermal transport is enhanced by the depletion of surface charge carriers, which results in transition from metallic to semiconducting behavior. Thus, the adsorption of porphyrin onto the Bi2Te3 NWs layer suppresses the surface electronic conduction, resulting in thermal electronic conduction dictated by the bulk of the NW. The results mean that electronic thermal transport can be decoupled from the electrical conductivity by changing the density of surface states on Bi2Te3 NWs.
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Research context
OpenAlex topics: Advanced Thermoelectric Materials and Devices · Topological Materials and Phenomena · Thermal properties of materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Chemical & Materials Engineering, New Mexico State University 1 , Las Cruces, New Mexico 88003, USA
Department of Materials Science and Engineering, Technion - Israel Institute of Technology 2 , Haifa 32000, Israel
Department of Physics, Indiana University 3 , Bloomington, Indiana 47405, USA
Electrical and Computer Engineering, Center for High Technology Materials, University of New Mexico 4 , Albuquerque, New Mexico 87106, USA
Center for Integrated Nanotechnologies, Sandia National Laboratories 5 , Albuquerque, New Mexico 87185, USA
Chemical Engineering Department, Manhattan College 6 , Riverdale, New York 10471, USA
Funding
National Aeronautics and Space Administration · United States-Israel Binational Science Foundation
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