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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2410.20705 |
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| _version_ | 1866914993215111168 |
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| author | Nguyen, Kien Trung Dong, Lan Anh Dinh, Hien Thi Bui, Thi Huyen Trang Chu, Son Truong Nguyen-Tran, Thuat Hoang, Chi Hieu Nguyen, Hung Quoc |
| author_facet | Nguyen, Kien Trung Dong, Lan Anh Dinh, Hien Thi Bui, Thi Huyen Trang Chu, Son Truong Nguyen-Tran, Thuat Hoang, Chi Hieu Nguyen, Hung Quoc |
| contents | Thermoelectricity in telluride materials is often improved by replacing telluride with selenium in its crystal. Most work, however, focuses on bulk crystal and leaves the 2D thin films intact. In this paper, we optimize the fabrication of selenium-doped bismuth telluride (Bi$_2$Te$_{3-\rm{x}}$Se$_{\rm{x}}$) thin films using a 3-source thermal co-evaporation. Thermoelectric properties, including the Seebeck coefficient and electrical resistivity, are systematically characterized to evaluate the material's performance for thermoelectric applications near room temperature. The thin films were deposited under carefully controlled conditions, with the evaporation rates of bismuth, tellurium, and selenium precisely monitored to achieve the desired stoichiometry and crystalline phase. Finally, thermoelectricity in Bi$_2$Te$_{3-\rm{x}}$Se$_{\rm{x}}$ at the ultra-thin regime is investigated. We consistently obtain films with thickness near 30 nm with a Seebeck coefficient of 400 $μ$V/K and a power factor of 1 mW/mK$^2$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_20705 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Optimization and Characterization of Thermoelectric Properties in Selenium-Doped Bismuth Telluride Ultra Thin Films Nguyen, Kien Trung Dong, Lan Anh Dinh, Hien Thi Bui, Thi Huyen Trang Chu, Son Truong Nguyen-Tran, Thuat Hoang, Chi Hieu Nguyen, Hung Quoc Materials Science Thermoelectricity in telluride materials is often improved by replacing telluride with selenium in its crystal. Most work, however, focuses on bulk crystal and leaves the 2D thin films intact. In this paper, we optimize the fabrication of selenium-doped bismuth telluride (Bi$_2$Te$_{3-\rm{x}}$Se$_{\rm{x}}$) thin films using a 3-source thermal co-evaporation. Thermoelectric properties, including the Seebeck coefficient and electrical resistivity, are systematically characterized to evaluate the material's performance for thermoelectric applications near room temperature. The thin films were deposited under carefully controlled conditions, with the evaporation rates of bismuth, tellurium, and selenium precisely monitored to achieve the desired stoichiometry and crystalline phase. Finally, thermoelectricity in Bi$_2$Te$_{3-\rm{x}}$Se$_{\rm{x}}$ at the ultra-thin regime is investigated. We consistently obtain films with thickness near 30 nm with a Seebeck coefficient of 400 $μ$V/K and a power factor of 1 mW/mK$^2$. |
| title | Optimization and Characterization of Thermoelectric Properties in Selenium-Doped Bismuth Telluride Ultra Thin Films |
| topic | Materials Science |
| url | https://arxiv.org/abs/2410.20705 |