COVER GALLERY

Highlighting a study on the band nestification of AgBiSe2-CuBiSe2 by a group of researchers led by Prof. Yeon Sik Jung from Korea Advanced Institute of Science and Technology and Prof. Min-Wook Oh from Hanbat National University.

Environmentally benign AgBiSe2-CuBiSe2 solid solutions are demonstrated as high-performance thermoelectric materials. By incorporating Cu atoms into Ag sites, multiple electronic bands are formed at an identical K point, abruptly increasing the weighted mobility of the material.

​

Selected as a back cover in J. Mater. Chem. A

Surface-Enhanced Raman Spectroscopy

In article number 2100640, Yeon Sik Jung, In-Hwan Lee, and co-workers demonstrate detection of antibiotics present in aqueous solutions via surface-enhanced Raman spectroscopy without using any Raman reporter molecules. Using the solvent-assisted nanotransfer printing technique, ultrafine Ag nanowires are conformally printed on GaN nanopillars to form a metal/semiconductor hybrid structure, which achieves a significant improvement of Raman signals.

​

Selected as a front cover in Advanced Science

Defect Engineering

​

In article number 2100895, Yeon Sik Jung, Min-Wook Oh, and co-workers demonstrate the underlying defect chemistry on the rebounding power factor of an Na and Ag co-doped PbTe. Excess Ag doping is proven to be effective to be the Te vacancy scavenger by forming interstitial Ag clusters, which is confirmed by advanced STEM and in situ characterizations.

​

Selected as a front cover in Advanced Science

​

​

Thermoelectric Materials

In article number 2204132, G. Jeffrey Snyder, Yeon Sik Jung, Min-Wook Oh, and co-workers show that charged cation antisites are principal defects forestalling p-type dopability of AgBiSe2-based thermoelectric materials via saturation annealing under selenium vapor. This finding offers a rational design rule for stabilizing thermoelectric properties of chalcogenide-based materials.

​

Selected as a front cover in Advanced Materials

​

​

​

Showcasing research from Professor Min-Wook Oh’s laboratory, Department of Materials Science and Engineering, Hanbat National University, Daejeon, South Korea

Electrically textured and thermally random characteristics are enabled by an unconventional microstructure–twisted grain boundary in tellurium (Te) crystal–towards high thermoelectric performance. The twisted Te crystal exhibits higher electrical conductivity and a comparable lattice thermal conductivity to that of polycrystalline Te, leading to an unprecedented zT value of 1.42 at 623 K.

​

Selected as a back cover in Energy Environ. Sci.