Thermal and Electronic Properties of Exfoliated Metal Chalcogenides

• DOI: 10.5012/bkcs.2010.31.11.3225
• Publication Date: 2010-12-14T04:01:31Z
• Authors: Jong-Young Kim; Soon-Mok Choi; Won-Seon Seo; Woo-Seok Cho
• Keywords: Exfoliation joint; Metastability

The thermal conductivity of layered metal chalcogenides such as <TEX>$MT_2$</TEX> (M = Mo, W; T S, Se) shows a marked decrease after exfoliation and subsequent restacking process. Random stacking two-dimensional crystalline sheets circumvents conduction pathways along longitudinal direction, which results in reduction conductivity. <TEX>$WS_2$</TEX> <TEX>$WSe_2$</TEX> compounds retain p-type conducting behavior with decreased electrical due to the change carrier concentration. <TEX>$MoSe_2$</TEX> compound exhibits metallic < <TEX>$130^{\circ}C$</TEX> small Seebeck coefficient, from metastable 1T-<TEX>$MoSe_2$</TEX> structure restacked phase.