Effect of Grain Size and Film Thickness on the Thermoelectric Properties of Flexible Sb2Te3 Thin Films
In this work, stoichiometric Sb2Te3 thin films with various thicknesses were deposited on a flexible substrate using RF magnetron sputtering. The grain size and thickness effects on the thermoelectric properties, such as the Seebeck coefficient (S), electrical conductivity (σ), power factor (PF), an...
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2019-01-01
|
| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2019/6954918 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832552078957871104 |
|---|---|
| author | Pornsiri Wanarattikan Piya Jitthammapirom Rachsak Sakdanuphab Aparporn Sakulkalavek |
| author_facet | Pornsiri Wanarattikan Piya Jitthammapirom Rachsak Sakdanuphab Aparporn Sakulkalavek |
| author_sort | Pornsiri Wanarattikan |
| collection | DOAJ |
| description | In this work, stoichiometric Sb2Te3 thin films with various thicknesses were deposited on a flexible substrate using RF magnetron sputtering. The grain size and thickness effects on the thermoelectric properties, such as the Seebeck coefficient (S), electrical conductivity (σ), power factor (PF), and thermal conductivity (k), were investigated. The results show that the grain size was directly related to film thickness. As the film thickness increased, the grain size also increased. The Seebeck coefficient and electrical conductivity corresponded to the grain size of the films. The mean free path of carriers increases as the grain size increases, resulting in a decrease in the Seebeck coefficient and increase in electrical conductivity. Electrical conductivity strongly affects the temperature dependence of PF which results in the highest value of 7.5 × 10−4 W/m·K2 at 250°C for film thickness thicker than 1 µm. In the thermal conductivity mechanism, film thickness affects the dominance of phonons or carriers. For film thicknesses less than 1 µm, the behaviour of the phonons is dominant, while both are dominant for film thicknesses greater than 1 µm. Control of the grain size and film thickness is thus critical for controlling the performance of Sb2Te3 thin films. |
| format | Article |
| id | doaj-art-524e2b9eecc141cba21748198a4b14b0 |
| institution | Kabale University |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-524e2b9eecc141cba21748198a4b14b02025-02-03T05:59:38ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422019-01-01201910.1155/2019/69549186954918Effect of Grain Size and Film Thickness on the Thermoelectric Properties of Flexible Sb2Te3 Thin FilmsPornsiri Wanarattikan0Piya Jitthammapirom1Rachsak Sakdanuphab2Aparporn Sakulkalavek3Faculty of Science and Technology, Huachiew Chalermprakiet University, Samut Prakarn 10540, ThailandCollege of Advanced Manufacturing Innovation, King Mongkut’s Institute of Technology Ladkrabang, Chalongksrung Rd., Ladkrabang, Bangkok 10520, ThailandCollege of Advanced Manufacturing Innovation, King Mongkut’s Institute of Technology Ladkrabang, Chalongksrung Rd., Ladkrabang, Bangkok 10520, ThailandFaculty of Science, King Mongkut’s Institute of Technology Ladkrabang, Chalongkrung Rd., Ladkrabang, Bangkok 10520, ThailandIn this work, stoichiometric Sb2Te3 thin films with various thicknesses were deposited on a flexible substrate using RF magnetron sputtering. The grain size and thickness effects on the thermoelectric properties, such as the Seebeck coefficient (S), electrical conductivity (σ), power factor (PF), and thermal conductivity (k), were investigated. The results show that the grain size was directly related to film thickness. As the film thickness increased, the grain size also increased. The Seebeck coefficient and electrical conductivity corresponded to the grain size of the films. The mean free path of carriers increases as the grain size increases, resulting in a decrease in the Seebeck coefficient and increase in electrical conductivity. Electrical conductivity strongly affects the temperature dependence of PF which results in the highest value of 7.5 × 10−4 W/m·K2 at 250°C for film thickness thicker than 1 µm. In the thermal conductivity mechanism, film thickness affects the dominance of phonons or carriers. For film thicknesses less than 1 µm, the behaviour of the phonons is dominant, while both are dominant for film thicknesses greater than 1 µm. Control of the grain size and film thickness is thus critical for controlling the performance of Sb2Te3 thin films.http://dx.doi.org/10.1155/2019/6954918 |
| spellingShingle | Pornsiri Wanarattikan Piya Jitthammapirom Rachsak Sakdanuphab Aparporn Sakulkalavek Effect of Grain Size and Film Thickness on the Thermoelectric Properties of Flexible Sb2Te3 Thin Films Advances in Materials Science and Engineering |
| title | Effect of Grain Size and Film Thickness on the Thermoelectric Properties of Flexible Sb2Te3 Thin Films |
| title_full | Effect of Grain Size and Film Thickness on the Thermoelectric Properties of Flexible Sb2Te3 Thin Films |
| title_fullStr | Effect of Grain Size and Film Thickness on the Thermoelectric Properties of Flexible Sb2Te3 Thin Films |
| title_full_unstemmed | Effect of Grain Size and Film Thickness on the Thermoelectric Properties of Flexible Sb2Te3 Thin Films |
| title_short | Effect of Grain Size and Film Thickness on the Thermoelectric Properties of Flexible Sb2Te3 Thin Films |
| title_sort | effect of grain size and film thickness on the thermoelectric properties of flexible sb2te3 thin films |
| url | http://dx.doi.org/10.1155/2019/6954918 |
| work_keys_str_mv | AT pornsiriwanarattikan effectofgrainsizeandfilmthicknessonthethermoelectricpropertiesofflexiblesb2te3thinfilms AT piyajitthammapirom effectofgrainsizeandfilmthicknessonthethermoelectricpropertiesofflexiblesb2te3thinfilms AT rachsaksakdanuphab effectofgrainsizeandfilmthicknessonthethermoelectricpropertiesofflexiblesb2te3thinfilms AT aparpornsakulkalavek effectofgrainsizeandfilmthicknessonthethermoelectricpropertiesofflexiblesb2te3thinfilms |