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CdSe Quantum Dots Enable High Thermoelectric Performance in Solution-Processed Polycrystalline SnSe.

Wei Dou1, Yaru Gong1, Xinqi Huang1

  • 1National Key Laboratory of Advanced Casting Technologies, MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology, Engineering Research Center of Materials Behavior and Design, Ministry of Education, Nanjing University of Science and Technology, Nanjing, 210094, China.

Small (Weinheim an Der Bergstrasse, Germany)
|February 3, 2024
PubMed
Summary
This summary is machine-generated.

High thermoelectric performance was achieved in germanium (Ge) and cadmium (Cd) codoped tin selenide (SnSe) using a solution process. Introducing CdSe quantum dots and lattice strain significantly reduced thermal conductivity and enhanced power factor.

Keywords:
SnSepeak ZTquantum dotssolution‐processedthermoelectric

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Nanotechnology

Background:

  • Tin selenide (SnSe) is a promising thermoelectric material.
  • Improving the thermoelectric performance of SnSe is crucial for energy harvesting applications.

Purpose of the Study:

  • To enhance the thermoelectric performance of solution-processed polycrystalline SnSe.
  • To investigate the effects of Ge and Cd codoping and CdSe quantum dots on SnSe's properties.

Main Methods:

  • Solution processing to introduce CdSe quantum dots into Ge and Cd codoped SnSe.
  • Microstructural characterization to confirm the presence of CdSe quantum dots.
  • Ultraviolet photoelectron spectroscopy to analyze electronic structure modifications.
  • Measurement of thermoelectric properties (Seebeck coefficient, electrical conductivity, thermal conductivity).

Main Results:

  • A high figure of merit (ZT) of ≈2.0 was achieved in Ge and Cd codoped SnSe.
  • CdSe quantum dots enhanced the density of states, leading to a larger Seebeck coefficient.
  • Ge and Cd codoping optimized carrier concentration and improved electrical conductivity.
  • CdSe quantum dots and lattice strain induced strong phonon scattering, resulting in ultralow lattice thermal conductivity.

Conclusions:

  • Solution-processed polycrystalline SnSe with Ge and Cd codoping and CdSe quantum dots exhibits excellent thermoelectric performance.
  • Microstructural manipulation, including quantum dot integration and lattice strain, is an effective strategy for designing advanced thermoelectric materials.