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<p>The harnessing of thermoelectric materials to convert waste heat into valuable green energy has garnered considerable global interest, driven by the swift depletion of fossil fuels and the abundance of untapped waste heat reservoirs. Researchers are actively seeking ways to develop highly efficient thermoelectric materials, aiming to create cost-effective systems that will expedite the technology’s transition to commercial viability. This study introduces a novel method to enhance Cu<sub>2</sub>Se’s thermoelectric properties by optimizing electronic and thermal transport through Ni and Zn co-doping, which has not been explored previously. Incorporating Ni and Zn simultaneously into the lattice of Cu<sub>2</sub>Se using a low-temperature hydrothermal route synergistically manipulates the electrical and thermal behaviour by augmenting carrier mobility and scattering phonons through lattice defects. Lattice defects induced by Ni and Zn co-doping reduce phonon relaxation time, achieving ultra-low thermal conductivity of 0.41&#xa0;W/mK at 573&#xa0;K. This, alongside an improved power factor, results in a maximum ZT of 0.761 for the Ni 1wt% Zn 1.5wt% co-doped sample, a fourfold enhancement over pristine Cu<sub>2</sub>Se. This research not only fills a gap in understanding the effects of dual doping on Cu<sub>2</sub>Se but also demonstrates its potential for advancing thermoelectric applications and improving thermal energy management.</p>

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Thermal energy management through thermoelectric generation using Ni, Zn co-doped Cu2Se nanocrystallites

  • 期刊论文

  • 发表日期：

    2025年1月27日

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  • T. Parvathy,
  • P. P. Pradyumnan

摘要

The harnessing of thermoelectric materials to convert waste heat into valuable green energy has garnered considerable global interest, driven by the swift depletion of fossil fuels and the abundance of untapped waste heat reservoirs. Researchers are actively seeking ways to develop highly efficient thermoelectric materials, aiming to create cost-effective systems that will expedite the technology’s transition to commercial viability. This study introduces a novel method to enhance Cu2Se’s thermoelectric properties by optimizing electronic and thermal transport through Ni and Zn co-doping, which has not been explored previously. Incorporating Ni and Zn simultaneously into the lattice of Cu2Se using a low-temperature hydrothermal route synergistically manipulates the electrical and thermal behaviour by augmenting carrier mobility and scattering phonons through lattice defects. Lattice defects induced by Ni and Zn co-doping reduce phonon relaxation time, achieving ultra-low thermal conductivity of 0.41 W/mK at 573 K. This, alongside an improved power factor, results in a maximum ZT of 0.761 for the Ni 1wt% Zn 1.5wt% co-doped sample, a fourfold enhancement over pristine Cu2Se. This research not only fills a gap in understanding the effects of dual doping on Cu2Se but also demonstrates its potential for advancing thermoelectric applications and improving thermal energy management.