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Graphene-Mediated Contact Engineering for a High Thermoelectric Performance in 2D PdSe2.

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  • 1Phonon Engineering Research Center of Jiangsu Province, Ministry of Education Key Laboratory of Numerical Simulation of Large-Scale Complex System, Center for Quantum Transport and Thermal Energy Science, Institute of Physics Frontiers and Interdisciplinary Sciences, School of Physics and Technology, Nanjing Normal University, Nanjing 210023, China.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Theoretical predictions suggest two-dimensional (2D) thermoelectric (TE) materials offer superior performance over bulk counterparts.
  • Experimental validation is hindered by high contact resistance in 2D materials due to their large surface-to-volume ratio.
  • Accurate evaluation of intrinsic TE properties requires mitigation of contact-related issues.

Purpose of the Study:

  • To develop a contact engineering strategy to overcome limitations in measuring 2D TE material properties.
  • To enhance the electrical performance and thermoelectric figure of merit (PF) in few-layer palladium diselenide (PdSe2).
  • To establish a reliable method for probing intrinsic TE properties of 2D materials.

Main Methods:

  • Fabrication of a field-effect transistor architecture using few-layer graphene electrodes.
  • Integration of a few-layer palladium diselenide (PdSe2) channel.
  • Full encapsulation of the device using hexagonal boron nitride (h-BN).
  • Characterization of contact resistance and thermoelectric performance.

Main Results:

  • Achieved significantly reduced contact resistance through engineered interfaces.
  • Demonstrated enhanced electrical performance and overcame the conductivity-Seebeck coefficient trade-off in few-layer PdSe2.
  • Attained a power factor (PF) of approximately 1.55 mW m⁻² K⁻² at room temperature, a record for 2D PdSe2 systems.

Conclusions:

  • The proposed contact engineering approach enables accurate probing of intrinsic TE properties in 2D materials.
  • The developed architecture significantly boosts the thermoelectric performance of 2D materials.
  • This work highlights the critical role of contact engineering for realizing high-efficiency 2D thermoelectric devices.