Prasad, Shyam K. and Rao, Ashok and Gahtori, Bhasker and Bathula, Sivaiah and Dhar, Ajay and Chang, Chia-Chi and Kuo, Yung-Kang (2017) Low-temperature thermoelectric properties of Pb doped Cu2SnSe3. Physica B: Condensed Matter, 520. 7-12. ISSN 0921-4526

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A series of Cu2Sn1-xPbxSe3 (0 <= x <= 0.04) compounds was prepared by solid state synthesis technique. The electrical resistivity (rho) decreased with increase in Pb content up to x = 0.01, thereafter it increased with further increase in x (till x = 0.03). However, the lowest value of electrical resistivity is observed for Cu2Sn0.96Pb0.04Se3. Analysis of electrical resistivity of all the samples suggests that small poloron hoping model is operative in the high temperature regime while variable range hopping is effective in the low temperature regime. The positive Seebeck coefficient (S) for pristine and doped samples in the entire temperature range indicates that the majority charge carriers are holes. The electronic thermal conductivity (kappa(e)) of the Cu2Sn1-xPbxSe3 compounds was estimated by the Wiedemann-Franz law and found that the contribution from kappa(e) is less than 1% of the total thermal conductivity (kappa). The highest ZT similar to 0.013 was achieved at 400 K for the sample Cu2Sn0.98Pb0.04Se3, about 30% enhancement as compared to the pristine sample.

Item Type: Article
Additional Information: Copyright for this article belongs to M/s Elsevier.
Subjects: Applied Physics/Condensed Matter
Depositing User: Users 27 not found.
Date Deposited: 12 Nov 2018 07:05
Last Modified: 12 Nov 2018 07:05

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