BiCuSeO/GdH2 thermoelectric composite: a p-type to n-type promoter with superior charge transport

R. Bhat Bhoomika, K. Gurukrishna, N. P. Madhukar, U. Deepika Shanubhogue, Ashok Rao, Ruei Yu Huang, Yung Kang Kuo, K. K. Nagaraja

Research output: Contribution to journalArticlepeer-review

Abstract

We herein report on compositing highly conductive GdH2 with BiCuSeO, with an aim to modulate the electronic transport and the nature of conductivity in the high-temperature regime. The incorporation of GdH2 as a minor matrix in BiCuSeO, as confirmed by structural studies, has considerably enhanced electrical conductivity in the system, thereby demonstrating the existence of thermal activation of the charge carriers. The effect of minor matrix is directly on the conversion of p-type to n-type conductivity in BiCuSeO system at near room temperature. Electronic quality factor (BE) has identified the ambiguities in the transport behaviour at near room temperature due to the addition of minor matrix. Enhancement in the power factor is seen due to GdH2, with a highest attained value of 221 μW m K−2 at 700 K for the sample with x = 11 wt%, which is nearly twice the value of pristine BiCuSeO. Highest ZT of 0.011 is obtained for the pristine BiCuSeO sample at 380 K.

Original languageEnglish
Article number775
JournalJournal of Materials Science: Materials in Electronics
Volume34
Issue number8
DOIs
Publication statusPublished - 03-2023

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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