Dr. Hang Chi has been actively pursuing advanced energy materials research, and (co-)authored 50+ publications in Science, Nature Communications, Journal of the American Chemical Society, Physical Review Letters, Physical Review B, Applied Physics Letters, and other top journals (with 1,000+ citations on Google Scholar).
Dr. Chi’s research primarily focuses on extraordinary thermoelectric, superconducting and Dirac materials that may transform the future of energy, combining first-principles simulations and transport measurements on high-quality bulk crystals, thin films grown by molecular beam epitaxy (MBE)/pulsed laser deposition (PLD), and devices fabricated via focused-ion-beam (FIB) and electron-beam (e-beam) lithography.
Dr. Chi’s expertise and research interests include:
● Novel electronic and topological materials for energy and environmental applications
● Advanced material preparation, modification and characterization techniques
● Transport processes in condensed matter systems (crystals, thin films and interfaces)
● Ab initio simulation of thermodynamic and electromagnetic properties of solids
As his ongoing and past projects, Dr. Chi has
● Studied temperature (down to 0.3 Kelvin) and magnetic field (up to 35 Tesla) dependent transport properties of topologically non-trivial transition metal di-, penta-chalcogenide single crystals, along with FeSe1-xTex-based superconducting thin films;
● Measured transport properties of CoSb3-based skutterudites, and illustrated the profound influence of microscopic atomic configurations on the macroscopic thermal conductivity;
● Investigated SnSe-based crystals holding a record ZTdev (surrogate of energy conversion efficiency in thermoelectric devices), along with other advanced IV-VI compound thermoelectrics such as SnTe, PbSe, and PbTe;
● Led examinations on Bi2Te3– and ZnTe-based crystals and/or thin films, revealing unprecedented phenomena including the strong phonon-drag thermopower in ZnTe and the tunability of the Fermi level and phonon-drag peak position in Bi2Te3;
● Carried out experiments on magnesium silicides (Mg2Si-Mg2Sn), copper chalcogenides (Cu2Se and Cu2Te), and mineral tetrahedrites (Cu12Sb4S13), enabling thermoelectrics with light elements and/or earth-abundant constituents;
● Developed novel materials preparation techniques such as the self-propagating high-temperature synthesis (SHS) combustion technique, which allows for ultrafast and large-scale industrial production of thermoelectric compounds.