Electronic and Thermoelectric Properties of Layered Oxychalcogenides (BiO)CuCh (Ch = S, Se, Te)
| Autor: | Andrivo Rusydi, Toshiki Nagasaki, Atsushi Higashiya, Shogo Nakamura, Kouichi Takase, Atsushi Yamasaki, Yudi Darma, Awabaikeli Rousuli, Yudhi Kurniawan, Seiya Ishiwata, Hitoshi Sato, Shibghatullah Muhammady, Yoshiaki Hara |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Chemistry
business.industry Analytical chemistry Fermi energy 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Spectral line 0104 chemical sciences Inorganic Chemistry Metal Semiconductor Electrical resistivity and conductivity visual_art Thermoelectric effect visual_art.visual_art_medium Crystallite Physical and Theoretical Chemistry 0210 nano-technology business Spectroscopy |
| Zdroj: | Inorganic Chemistry. 57:10214-10223 |
| ISSN: | 1520-510X 0020-1669 |
| DOI: | 10.1021/acs.inorgchem.8b01396 |
| Popis: | We study the new details of electronic and thermoelectric properties of polycrystalline layered oxychalcogenide systems of (BiO)CuCh (Ch = Se, Te) prepared by using a solid-state reaction. The systems were characterized by using photoemission (PE) spectroscopy and four-probe temperature-dependent electrical resistivity ρ(T). PE spectra are explained by calculating the electronic properties using the generalized-gradient approximation method. PE spectra and ρ(T) show that (BiO)CuSe system is a semiconductor, while (BiO)CuTe system exhibits the metallic behavior that induces the high thermoelectric performance. The calculation of electronic properties of (BiO)CuCh (Ch = S, Se, Te) confirms that the metallic behavior of (BiO)CuTe system is mainly induced by Te 5p states at Fermi energy level, while the indirect bandgaps of 0.68 and 0.40 eV are obtained for (BiO)CuS and (BiO)CuSe systems, respectively. It is also shown that the local symmetry distortion at Cu site strongly stimulates Cu 3d-t2g to be partially... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|