Enhancement of low-temperature thermoelectric performance via Pb doping in Cu3SbSe4

Anand Pal, K. Shyam Prasad, K. Gurukrishna, Suraj Mangavati, P. Poornesh, Ashok Rao, Yin Chun Chung, Y. K. Kuo

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2 Citations (Scopus)


We investigated the synthesis protocols of the pure and Pb-doped bulk polycrystalline Cu3Sb1-xPbxSe4 (0 ≤ x ≤ 0.04) system and studied their crystallographic and thermoelectric properties intending to reach a high figure of merit (ZT). The solid-state reaction method under a 10−5 Torr vacuum was employed to synthesize the pristine and doped samples. The Rietveld analysis of room-temperature X-ray diffraction confirmed tetragonal structure with space group I4‾2m for all studied compositions. The electrical resistivity [ρ(T)] demonstrated a degenerate semiconducting behavior for pure as well as doped samples. The overall ρ(T) increased with increasing Pb content. The positive values of Seebeck coefficient [S(T)] data in the investigated temperature range for all the studied compositions revealed that holes played a major role in the conduction mechanism. The S(T) values rose with increased temperature, a characteristic of degenerate semiconductors. The temperature-dependent Seebeck coefficient data analysis revealed a narrow bandgap behavior for all studied samples. The analysis suggests that the electronic thermal conductivity only contributed up to 1% to the total thermal conductivity, and the remaining 99% was contributed by lattice thermal conductivity. The estimated ZT values showed as much as 20% enhancement at 380 K for a 1% doped sample, Cu3Sb0.99Pb0.01Se4. The thermoelectric compatibility factor decreased with doping, and a maximum value (1.14 V−1) was found for the pristine sample at 250 K.

Original languageEnglish
Article number111197
JournalJournal of Physics and Chemistry of Solids
Publication statusPublished - 04-2023

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics


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