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Thermosensation01:43

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Peripheral thermosensation is the perception of external temperature. A change in temperature (on the surface of the skin and other tissues) is detected by a family of temperature-sensitive ion channels called Transient Receptor Potential, or TRP, receptors. These receptors are located on free nerve endings. Those detecting cold temperatures are closer to the surface of the skin than the nerve endings detecting warmth. These thermoTRP channels, while temperature selective, have relatively...
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Optothermotronic effect as an ultrasensitive thermal sensing technology for solid-state electronics.

T Dinh1,2, T Nguyen1, A R M Foisal1

  • 1Queensland Micro- and Nanotechnology Centre, Griffith University, Brisbane, Queensland, Australia.

Science Advances
|June 11, 2020
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Researchers developed optothermotronics, a new method using light and electric current to significantly boost temperature sensing in semiconductor nanofilms. This technique enhances thermal sensing performance by over 100 times, paving the way for advanced solid-state electronics.

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Area of Science:

  • Solid-state electronics
  • Nanotechnology
  • Optoelectronics

Background:

  • Thermal excitation and transport of charge carriers are crucial for high-performance sensing in solid-state electronics.
  • Current sensing technologies face challenges in achieving optimal thermal detection and regulation.
  • Nanoheterostructures offer potential for enhanced electronic properties and sensing capabilities.

Purpose of the Study:

  • To introduce and demonstrate a novel optoelectronic coupling method, termed optothermotronics, for giant temperature sensing.
  • To enhance thermal sensing performance in semiconductor nanofilms by manipulating charge carrier dynamics.
  • To explore the potential of silicon carbide (SiC) nanofilms in optothermoelectronic temperature sensing.

Main Methods:

  • Fabrication of SiC nanofilms on Si substrates to create nanoheterostructures.
  • Application of nonuniform light illumination to create a charge carrier gradient.
  • Coupling the charge carrier gradient with an electric tuning current to modulate thermal sensing.
  • Characterization of the temperature sensing effect and performance enhancement.

Main Results:

  • Demonstration of a giant temperature sensing effect in SiC nanofilms via optothermotronics.
  • Enhancement of sensing performance by over 100 times through photon excitation.
  • Achieved a giant temperature coefficient of resistance (TCR) of up to -50%/K.
  • Successfully coupled light-induced charge carrier gradients with electric current for improved sensing.

Conclusions:

  • Optothermotronics significantly enhances thermal sensing performance in semiconductor nanofilms.
  • The developed method offers a substantial improvement over existing solid-state sensing technologies.
  • This approach holds promise for advancing high-performance temperature sensing applications in electronics.