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Related Concept Videos

P-N junction01:11

P-N junction

508
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...
508

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Harnessing Persistent Photocurrent in a 2D Semiconductor-Polymer Hybrid Structure: Electron Trapping and Fermi Level

Seungho Bang1, Wooyoung Kang1, Dohyeong Kim1

  • 1Department of Physics, Hanyang University (HYU), Seoul 04763, Republic of Korea.

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|July 10, 2024
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Summary

This study explores 2D semiconductor optoelectronic memory, showing charge trapping enhances persistent photocurrent (PPC). Higher temperatures improve PPC, enabling memory function at 433 K.

Keywords:
Shockley−Read−Hall modelhigh-level injectionpersistent photocurrentphotogating effecttrap site

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Device Engineering

Background:

  • 2D semiconductors offer integrated optoelectronic memory solutions, overcoming von Neumann limitations.
  • Persistent photocurrent (PPC) in 2D materials is crucial for optoelectronic memory, driven by charge carrier trapping (Shockley-Read-Hall model).
  • Understanding quasi-Fermi level modulation's effect on PPC is vital for device optimization.

Purpose of the Study:

  • To demonstrate and investigate the mechanism of optoelectronic memory in a 2D semiconductor-polymer hybrid structure.
  • To explore the correlation between quasi-Fermi level modulation and persistent photocurrent (PPC).
  • To assess the temperature-dependent performance of the optoelectronic memory device.

Main Methods:

  • Fabrication of a 2D semiconductor-polymer hybrid optoelectronic memory device.
  • Utilizing the Shockley-Read-Hall (SRH) model to explain charge trapping mechanisms.
  • Investigating charge carrier dynamics, including electron transfer and quasi-Fermi level shifts under varying temperatures and light illumination.

Main Results:

  • The hybrid device exhibits optoelectronic memory behavior governed by charge trapping, consistent with the SRH model.
  • Electron transfer from polyvinylpyrrolidone to p-type tungsten diselenide induces high-level injection and carrier-type transitions.
  • Increasing temperature leads to an upward shift in the quasi-Fermi level, enhancing PPC and enabling memory operation up to 433 K.

Conclusions:

  • The study confirms charge trapping as the key mechanism for PPC in 2D semiconductor-polymer hybrid optoelectronic memory.
  • Quasi-Fermi level modulation, influenced by temperature, is critical for optimizing PPC and memory performance.
  • The findings provide a foundation for designing high-performance 2D semiconductor-based optoelectronic memory devices.