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High thermoelectric efficiency realized in SnSe crystals via structural modulation.

Bingchao Qin1, Dongyang Wang2, Tao Hong1

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Summary
This summary is machine-generated.

High-performance tin selenide (SnSe) crystals were developed for efficient thermoelectric applications. Alloying with strontium optimized crystal structure, significantly boosting performance for power generation and electronic cooling.

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Area of Science:

  • Materials Science
  • Solid State Physics

Background:

  • Crystalline thermoelectrics are crucial for waste heat recovery and electronic cooling.
  • Tin selenide (SnSe) crystals are representative thermoelectric materials.

Purpose of the Study:

  • To enhance the efficiency of SnSe crystals through structural modulation.
  • To investigate the effect of strontium alloying on SnSe crystal properties.

Main Methods:

  • Structural modulation via strontium alloying at tin sites.
  • Characterization of crystal structure and thermoelectric properties.

Main Results:

  • Achieved a power factor (PF) of ~85 μW cm⁻¹ K⁻².
  • Obtained an ultrahigh figure of merit (ZT) of ~1.4 at 300 K and an average ZT (ZTave) of ~2.0 from 300-673 K.
  • Demonstrated a single-leg device efficiency of ~8.9% and a maximum cooling temperature difference (ΔTmax) of ~50.4 K.

Conclusions:

  • Strontium alloying effectively optimizes multiband characteristics in p-type SnSe.
  • The enhanced SnSe crystals show superior performance for low- to mid-temperature thermoelectric applications.
  • These findings advance the practical application of p-type SnSe for waste heat recovery and electronic cooling.