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Thermal expansion and Thermal stress: Problem Solving01:27

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San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in temperature (ΔT) is 55...
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Improving the Long-Term Stability of PbTe-Based Thermoelectric Modules: From Nanostructures to Packaged Module

Philipp Sauerschnig1, Noriyuki Saitou2, Masanori Koshino3

  • 1Global Zero Emission Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8569, Japan.

ACS Applied Materials & Interfaces
|August 2, 2024
PubMed
Summary

This study demonstrates stable nanoprecipitates in nanostructured lead telluride (PbTe) thermoelectric materials. A new module design enhances durability and achieves 6.8% conversion efficiency with minimal degradation over 740 hours.

Keywords:
electronic packaginglead telluridelong-term stabilitynanostructuringpower generationthermoelectricthermoelectric module architecture

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Energy Conversion

Background:

  • Nanostructured lead telluride (PbTe) is a leading thermoelectric material for intermediate temperatures.
  • Fabrication challenges include material stability, particularly nanoprecipitates, and electrical contact bonding.
  • Improving module durability and preventing material-electrode interactions are crucial for practical applications.

Purpose of the Study:

  • To investigate the thermal stability of nanoprecipitates in p-type PbTe.
  • To develop and optimize a novel module architecture for enhanced durability and performance.
  • To evaluate the long-term operational stability and power generation characteristics of the developed module.

Main Methods:

  • In situ high-temperature transmission electron microscopy (TEM) for nanoprecipitate stability analysis.
  • Finite element method (FEM) simulations for thermal stress and power generation optimization.
  • Module fabrication using nanostructured p-type and n-type PbTe with flexible diffusion barriers and interconnecting electrodes.

Main Results:

  • Nanoprecipitates in p-type Pb0.973Na0.02Ge0.007Te remained stable up to ~786 K.
  • The new module architecture effectively prevented material-electrode interactions and reduced thermal stress.
  • A maximum conversion efficiency of ~6.8% was achieved for a temperature difference of ~480 K.
  • Long-term operation (~740 h) showed only a ~3% reduction in output power and efficiency.

Conclusions:

  • The developed module architecture ensures good long-term stability for nanostructured PbTe thermoelectric generators.
  • The findings address key challenges in fabricating durable and efficient PbTe-based power modules.
  • This work paves the way for practical applications of high-performance thermoelectric devices.