Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.159
Publication date: 7th February 2022
Thermoelectricity enables the direct and reversible conversion between heat and electricity through solid-state devices. However, despite many potential applications, their extended use has been seriously hampered by the relatively high production cost and low efficiency of thermoelectric materials. The problem is that thermoelectric materials require high electrical conductivity (s), high thermopower (S), and low thermal conductivity (k), three strongly interdependent properties.
Thermoelectric materials are often dense, polycrystalline inorganic semiconductors. Among the various strategies to produce them, the use of solution-processed nanoparticles as precursors allows their production with mild synthesis conditions, inexpensive equipment, and the possibility of high-throughput processing. However, solution synthesis generally involves the presence of additional molecules or ions belonging to the precursors or added to enable solubility and/or regulate nucleation and growth. These molecules or ions can end up in the particles either as impurities within the crystal lattice or as surface adsorbates and, therefore, interfere in the material properties.
Herein, we demonstrate the unavoidable but generally overlooked presence of ionic adsorbates in solution-processed surfactant-free synthesis and their importance in the transport properties. Furthermore, we explain the rationale behind its presence based on the fundamentals of colloidal science. These findings highlight the importance of evaluating possible unintentional impurities and their origin to i) establish the proper structure-property relationships and ii) redefine synthetic protocols to tune material properties controllably [1].
Werner Siemens Foundation
European Union's Horizon 2020
FWF “Lise Meitner Fellowship”
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