Séminaire Cethil : Atomic-level crystal lattice chemistry for high- performance bulk thermoelectric materials, In Chung, Seoul University, Korea

The introduction of foreign atoms and/or vacancies into bulk crystal lattices induces atomic-level defects, forming unique defect structures depending on their atomic coordination chemistry and sizes relative to constituent atoms in the matrix. These defects can develop into more complex structures such as one-dimensional dislocations and multidimensional nanostructures. They uniquely interact with charge carriers and phonons that determine many important physical properties of materials, consequently serving as an effective means of manipulating properties of bulk solids for extraordinary behaviors. Accordingly, elucidating formation mechanisms of these defects is the innovative foundation of developing highly predictable design principles for desired defect structures within bulk crystals. Understanding atomic-level crystal lattice design can be extended to more macroscopic lattice chemistry to stabilize unique heterostructured nanohybrid materials. This unique material design can realize extraord