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Investigation of PdTe2 Phase Segregation on Thermoelectric Properties of n-Type Bi2Te2.7Se0.3 Fabricated by Melt-Spinning Technique for Possible Carrier Filtering Effect

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Abstract

Influence of secondary phases of PdTe2 in n-type thermoelectric Cu0.008Bi2Te2.7Se0.3 alloys on their thermoelectric properties was investigated through in situ phase separation by melt spinning process. The phase segregation of PdTe2 in the Cu0.008Bi2Te2.7Se0.3 matrix were successfully induced by using the melt spinning process. Since heterointerfaces of PdTe2 and Cu0.008Bi2Te2.7Se0.3 form potential barriers, low energy carrier filtering effect could be expected; however, the power factor and effective mass decreased with the PdTe2 addition, which implies that the carrier filtering effect did not occur. The potential barrier of 0.06 eV expected at the interfaces between PdTe2 and Cu0.008Bi2Te2.7Se0.3 matrix seems not to induce carrier energy filtering effect. However, further investigation based on single parabolic band model shows that the non-degenerate mobility and quality factor B are enhanced by PdTe2 addition, suggesting that the further optimization of the carrier concentration would increase zT further in PdTe2-added Cu0.008Bi2Te2.7Se0.3 samples. This implies that the favorable carrier filtering effect could be attained by further controlling the optimal carrier concentration even with small barrier heights.

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Acknowledgements

This work was supported by the Samsung Research Funding & Incubation Center of Samsung Electronics under Project Number SRFC-MA1701-05.

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  1. Dong Ho Kim and Hyun-Sik Kim have contributed equally to this work.

Authors and Affiliations

  1. Department of Materials Science and Engineering, University of Seoul, Seoul, 02504, South Korea

    Dong Ho Kim, Seokown Hong, Ju Hyeong Lee, Jae Gwan Han, Hong Sik Cho, Se Woong Lee & Sang-il Kim

  2. Department of Materials Science and Engineering, Hongik University, Seoul, 04066, South Korea

    Hyun-Sik Kim

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  1. Dong Ho Kim
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Correspondence to Sang-il Kim.

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Kim, D.H., Kim, HS., Hong, S. et al. Investigation of PdTe2 Phase Segregation on Thermoelectric Properties of n-Type Bi2Te2.7Se0.3 Fabricated by Melt-Spinning Technique for Possible Carrier Filtering Effect. Electron. Mater. Lett. 17, 436–442 (2021). https://doi.org/10.1007/s13391-021-00300-0

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