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High-performance and self-powered visible light photodetector using multiple coupled synergetic effects.

José P B Silva1,2, Eliana M F Vieira3,4, Katarzyna Gwozdz5

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Materials Horizons
|November 27, 2023
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Summary
This summary is machine-generated.

This study introduces a novel self-powered photodetector by combining pyroelectric, photovoltaic, and plasmonic effects. This integration significantly enhances performance in the visible spectrum, offering superior responsivity and detectivity.

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Self-powered photodetectors are crucial for low-power electronic applications.
  • Enhancing photodetector performance, particularly in the visible spectrum, remains a key challenge.
  • Combining multiple physical effects offers a promising route for next-generation optoelectronic devices.

Purpose of the Study:

  • To demonstrate a novel method for significantly enhancing self-powered photodetector performance in the visible region.
  • To investigate the synergistic effects of pyroelectric, photovoltaic, and plasmonic phenomena in a single device.
  • To fabricate and characterize a tri-layered heterojunction photodetector incorporating silver nanoparticles.

Main Methods:

  • Fabrication of a tri-layered heterojunction photodetector using n-Si/p-SnO/n-ZnO.
  • Inclusion of silver (Ag) nanoparticles (NPs) at the SnO/ZnO interface to leverage the plasmonic effect.
  • Characterization of the device's photo-response under a chopped 650 nm laser excitation.
  • Optimization of Ag NPs size and shape for maximum performance enhancement.

Main Results:

  • The photodetector incorporating spheroidal Ag NPs (∼70 nm diameter) showed the most significant performance enhancement.
  • The optimized Al/Si/SnO/Ag NPs/ZnO/ITO device achieved responsivity of 210.2 mA W⁻¹, detectivity of 5.47 × 10⁹ Jones, and sensitivity of 15.0 × 10⁴.
  • The device exhibited fast response times with rise and fall times of 2.3 μs and 51.3 μs, respectively.
  • Performance metrics were superior to existing ZnO-based pyro-phototronic photodetectors.

Conclusions:

  • Coupling pyroelectric, photovoltaic, and plasmonic effects is a viable and effective strategy for high-performance self-powered photodetectors.
  • The developed photodetector demonstrates state-of-the-art performance for visible light detection.
  • This work paves the way for advanced optoelectronic applications utilizing synergistic physical effects.