Abstract
Thermoelectric materials with optimum carrier concentration of the order of 1019–1020/cm3 are required to obtain a high figure of merit (ZT) value. As undoped In0.8Ga0.2Sb has a lower carrier concentration (~1016/cm3), Te impurity was doped between low (1 × 1018/cm3) and high level (1 x 1021/cm3) to understand the effects of doping on its thermoelectric properties. The undoped and Te-doped In0.8Ga0.2Sb crystals retained cubic zinc blende crystal structure irrespective of heavy doping of Te element. In addition to the optical phonon vibrational modes, acoustic phonon modes were also present when the doping concentration exceeded 1 × 1018/cm3. The carrier concentration in Te-doped In0.8Ga0.2Sb crystals were varied in the range 1018–1020/cm3. Te-doped In0.8Ga0.2Sb with concentration 1 × 1018/cm3 was recorded a higher power factor because of its lower resistivity and higher mobility than other crystals. The ZT of Te-doped In0.8Ga0.2Sb (1 × 1018/cm3) was higher than other samples at 300–450 K. This study revealed that the optimum Te dopant concentration to enhance the ZT value of InxGa1−xSb is 1 x 1018/cm3 for optimizing its properties toward mid-temperature thermoelectric applications.
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Acknowledgements
The authors acknowledge Shizuoka University, Ibaraki University, and Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Japan for the support in material preparation and analyses. We also thank for the financial support by JSPS KAKENHI Grant-in-Aid for Scientific Research (B) (Grant no: JP19H02491) and CSIR-Institute of Minerals and Materials Technology, India (project grant OLP-114).
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The conception was done by NKV. The experiment, design and measurements were carried out by NKV, YH, HU and YI. The results were analyzed and manuscript draft was prepared by NKV. YH, HU, and YI validated and suggested corrections in the manuscript.
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Velu, N.K., Hayakawa, Y., Udono, H. et al. Effects of Te-doping on the thermoelectric properties of InGaSb crystals. J Mater Sci: Mater Electron 34, 1480 (2023). https://doi.org/10.1007/s10854-023-10900-1
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DOI: https://doi.org/10.1007/s10854-023-10900-1