Browsing by Author "Li, Chien-He"

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Ternary Chalcogenides GeSb2Se3 and Ge3Sb4Se7 Containing a (1)(infinity)[Sb2Se2](2-) 1D Chain and a 2D Structure Related to SnSe
(2020-08-17)
Chen, Guan-Ruei
;
Li, Chien-He
;
Yu, Ching-Yi
;
Wang, Ming-Fang
;
Lee, Chi-Shen
Ternary chalcogenides, GeSb2Se3 and Ge3Sb4Se7, were synthesized and characterized. These chalcogenides are the first ternary selenides in a ternary Ge-Sb-Se system that feature a layer structure related to black phosphorus and SnSe-type structures. Both compounds contain a(infinity)( 1)[Sb2Se2](2-) unit with Sb+ cations in a zigzag Sb-Sb chain structure, and Sb3+ cations in a distorted NaCl100-type of (1)(infinity)[Gen-2Sb2Sen](2+) unit (n = 4, 5). These materials exhibit n-type semiconducting properties with thermal conductivity significantly lower than that of GeSe and Sb2Se3, which could be correlated to the 1D Sb+ chain and disordered sites with different Ge/Sb compositions. It is anticipated that these newly discovered ternary chalcogenides may provide unique properties with enhanced thermoelectric properties.