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Related Concept Videos

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Photoelectric Effect

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When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
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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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A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
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Self-Powered Photodetector Using Two-Dimensional Ferroelectric Dion-Jacobson Hybrid Perovskites.

In-Hyeok Park1, Ki Chang Kwon1, Ziyu Zhu1

  • 1Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore.

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|October 28, 2020
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We developed a novel photodetector using Dion-Jacobson phase organic-inorganic hybrid perovskites. This material offers enhanced stability and efficient visible light photodetection, paving the way for advanced optoelectronic devices.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Optoelectronics

Background:

  • Dion-Jacobson (DJ) phase organic-inorganic hybrid perovskites (OIHPs) offer superior chemical stability and ferroelectric properties compared to Ruddlesden-Poppers perovskites.
  • Ferroelectric materials enable tunable electronic properties, crucial for advanced device applications.

Purpose of the Study:

  • To fabricate and characterize a ferroelectricity-modulated photodetector using the n=2 homologue of DJ-OIHP, (AMP)(MA)Pb2I7.
  • To investigate the influence of ferroelectric polarization on photodetector performance.

Main Methods:

  • Synthesis and fabrication of the (AMP)(MA)Pb2I7 (DJP) thin films.
  • Characterization of ferroelectric properties, including out-of-plane polarization and coercive field.
  • Photodetection measurements to assess responsivity and carrier dynamics.

Main Results:

  • The fabricated DJP photodetector exhibited an out-of-plane polarization of 3.7 μC/cm².
  • DJP demonstrated a longer carrier lifetime and a red-shifted absorption edge (580 nm) compared to its n=1 counterpart.
  • A responsivity of 0.16 mA/W was achieved at 532 nm, indicating efficient visible light photodetection.

Conclusions:

  • The n=2 DJ-OIHP is a promising material for ferroelectricity-modulated photodetectors.
  • Remnant polarization significantly influences photocurrent direction and magnitude.
  • DJ-OIHPs present a viable alternative for stable and efficient optoelectronic devices.