Ternary Chalcogenides GeSb2Se3 and Ge3Sb4Se7 Containing a ∞1[Sb2Se2]2- 1D Chain and a 2D Structure Related to SnSe

Guan-Ruei Chen; Chien-He Li; Ching-Yi Yu; Ming-Fang Wang; Chi-Shen Lee

doi:10.1021/acs.inorgchem.0c00515

Ternary Chalcogenides GeSb₂Se₃ and Ge₃Sb₄Se₇ Containing a _∞¹[Sb₂Se₂]^2- 1D Chain and a 2D Structure Related to SnSe

Inorg Chem. 2020 Aug 17;59(16):11207-11212. doi: 10.1021/acs.inorgchem.0c00515. Epub 2020 Jul 30.

Authors

Guan-Ruei Chen¹, Chien-He Li², Ching-Yi Yu¹, Ming-Fang Wang¹, Chi-Shen Lee^{1

3}

Affiliations

¹ Department of Applied Chemistry, College of Science, National Chiao Tung University (NCTU), Hsinchu 30010, Taiwan.
² Graduate Degree Program for Science and Technology of Accelerator Light Source, College of Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan.
³ Center for Emergent Functional Matter Science, National Chiao Tung University, Hsinchu 30010, Taiwan.

PMID: 32799507
DOI: 10.1021/acs.inorgchem.0c00515

Abstract

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 _∞¹[Sb₂Se₂]^2- unit with Sb⁺ cations in a zigzag Sb-Sb chain structure, and Sb³⁺ cations in a distorted NaCl¹⁰⁰-type of _∞¹[Ge_n-2Sb₂Se_n]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.