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P-N junction01:11

P-N junction

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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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Polycrystalline Silicon Thin-film Solar cells with Plasmonic-enhanced Light-trapping
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Janus Photothermal Films with Orientated Plasmonic Particle-in-Cavity Surfaces Enabling Heat Control in

Zongming Xie1, Junhao Zhuang1, Haowen Chen2

  • 1Fujian Provincial Key Laboratory of Biochemical Technology, Huaqiao University, Xiamen 361021, P. R. China.

ACS Applied Materials & Interfaces
|November 24, 2024
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Summary

Researchers developed advanced Janus photothermal films using Au@AgPd nanostructures. These films enhance solar thermoelectric generator (STEG) performance by reducing heat loss and improving solar-to-electric conversion efficiency.

Keywords:
Janus photothermal filmdirectional heat transferheat localizationnoble metal nanocrystalsplasmonic photothermal conversion

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Renewable Energy

Background:

  • Solar thermoelectric generators (STEGs) convert solar energy to electricity but suffer from performance limitations due to heat losses.
  • Increasing solar absorber area in STEGs exacerbates heat loss issues, hindering overall efficiency.

Purpose of the Study:

  • To develop novel Janus photothermal films with broadband plasmonic absorption for enhanced solar-thermal-electric conversion.
  • To investigate the effect of oriented nanostructures on heat management and energy conversion in STEGs.

Main Methods:

  • Preparation of Au@AgPd nanostructure monolayer/poly(vinyl alcohol) (PVA) Janus photothermal films.
  • Uniaxial stretching to align Au@AgPd nanostructures, creating particle-in-cavity structures.
  • Integration of Janus films with commercial thermoelectric generators (TEGs) and carbon-based solar absorbers.

Main Results:

  • Janus films exhibited broadband plasmonic absorption and effectively converted sunlight to heat.
  • Oriented particle-in-cavity structures trapped heat and facilitated directional transfer, reducing heat loss by ~50%.
  • Integration yielded an open-circuit voltage of 308 mV and an output power density of 1.3 W m⁻² in a conventional STEG.

Conclusions:

  • The developed Janus photothermal films with oriented nanostructures significantly improve STEG performance and heat management.
  • This design offers a promising approach for high-efficiency solar energy conversion in various solar-thermal systems.