| Autor: |
S Radha, J Mani, R Rajkumar, M Arivanandhan, R Jayavel, G Anbalagan |
| Jazyk: |
angličtina |
| Rok vydání: |
2023 |
| Předmět: |
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| Zdroj: |
Materials Research Express, Vol 10, Iss 2, p 025501 (2023) |
| Druh dokumentu: |
article |
| ISSN: |
2053-1591 |
| DOI: |
10.1088/2053-1591/acacea |
| Popis: |
Most promising oxide thermoelectric (TE) materials such as perovskites, layered oxide materials, Al-doped ZnO, etc, have been reported. In the present work, Zn _1− _x Cu _x Al _2 O _4 (0.0 ≤ x ≤ 0.1) samples were synthesized by a simple hydrothermal method. The structural, optical, morphological, and TE properties of Zn _1− _x Cu _x Al _2 O _4 (0.0 ≤ x ≤ 0.1) have been investigated. XRD analysis reveals that ZnAl _2 O _4 has a single-phase cubic structure and Cu is completely dissolved in the ZnAl _2 O _4 lattice. Thermal analysis shows that ZnAl _2 O _4 has high thermal stability up to 1000 °C. From the UV–vis DRS analysis, the energy band gap of ZnAl _2 O _4 decreased from 3.30 eV to 2.82 eV with increasing the content of Cu. Carrier concentration and mobility of the samples were measured by the Hall effect. The values of a carrier concentration of undoped ZnAl _2 O _4 and Zn _0.9 Cu _0.1 Al _2 O _4 are obtained to be 3.836 × 10 ^13 cm ^−3 and 3.3 × 10 ^16 cm ^−3 at 313 K and 9.6 × 10 ^13 cm ^−3 for pure and 5.5 × 10 ^16 cm ^−3 for Zn _0.9 Cu _0.1 Al _2 O _4 at 673 K. TE properties of the synthesized samples have been analyzed as a function of temperature. With the optimum values of Seebeck coefficient and electrical conductivity, Zn _0.9 Cu _0.1 Al _2 O _4 shows the highest power factor of 0.50 μ W/mK ^2 while the pure ZnAl _2 O _4 shows a maximum power factor of 0.19 μ W/mK ^2 at 673 K. The Zn _0.9 Cu _0.1 Al _2 O _4 exhibits a relatively high zT of 2.4 × 10 ^−4 at 673 K, while pure ZnAl _2 O _4 has a zT value of 0.4 × 10 ^−4 at 673 K. The obtained values reveal the improvement of TE properties by increasing the Cu content in the sample. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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