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Modulating Persistent Photoconductivity through Barrier Engineering for High-performance and Multifunctional

Panpan Huo1, Xinhao Zhang1, Xiangyong Cui1

  • 1School of Physics and Optoelectronics, Shandong Normal University, Jinan, People's Republic of China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
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PubMed
Summary
This summary is machine-generated.

Researchers modulated persistent photoconductivity (PPC) in 2D optoelectronic devices by engineering Schottky barriers. This breakthrough enables tunable device performance for applications like photomemory and photodetectors.

Keywords:
2D materialsbarrier engineeringpersistent photoconductivityphotodetectorsphotomemory devices

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • 2D optoelectronic devices offer potential for multifunctional applications.
  • Persistent photoconductivity (PPC) modulation is crucial for device functionality and performance.
  • Challenges in PPC modulation include surface defects, Fermi level pinning, and Schottky barriers.

Purpose of the Study:

  • To demonstrate effective PPC modulation in 2D devices by reducing surface defects and Fermi level pinning.
  • To engineer Schottky barriers for tunable PPC gain (PPCG).
  • To explore applications of tailored PPC in optoelectronics.

Main Methods:

  • Utilized a van der Waals contact strategy to tailor Schottky barrier heights.
  • Engineered junctions with varying barrier heights using materials like Au/MoS2 and 1T'-WTe2/MoS2.
  • Characterized PPC gain, relaxation current linearity, on/off ratio, response time, and responsivity.

Main Results:

  • Achieved tunable PPCG from 307.6% to 4.72% by modifying Schottky barrier heights.
  • Demonstrated a high PPCG (307.6%) in a high-barrier Au/MoS2 junction (linearity 0.986) for photomemory and neuromorphic applications.
  • Achieved a low PPCG (4.72%) in a low-barrier 1T'-WTe2/MoS2 junction (on/off ratio 105, response time 2 ms, responsivity 30.1 A/W) for photodetectors.

Conclusions:

  • Reducing surface defects and Fermi level pinning enables effective PPC modulation through barrier engineering.
  • Tailoring Schottky barriers via van der Waals contacts provides a pathway for designing diverse 2D optoelectronic devices.
  • The study advances the understanding of PPC and offers strategies for high-performance 2D optoelectronic device design.