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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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Photoluminescence: Applications01:14

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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
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Photoluminescence: Fluorescence and Phosphorescence01:23

Photoluminescence: Fluorescence and Phosphorescence

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Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
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Sensitive photodetection in a violet phosphorus tunnel junction.

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    This study presents a novel violet phosphorus photodetector with enhanced photoresponsivity. The gate-tunable vertical tunnel junction design improves charge carrier transport, boosting performance for advanced optoelectronic devices.

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    Area of Science:

    • Materials Science
    • Condensed Matter Physics
    • Nanotechnology

    Background:

    • Two-dimensional violet phosphorus (VP) shows promise for photodetectors due to its high on/off ratio and anisotropic detectivity.
    • Intrinsic resistance in VP limits its photoresponsivity, hindering practical applications.

    Purpose of the Study:

    • To develop a gate-tunable vertical tunnel junction device using violet phosphorus and graphene.
    • To enhance the photoresponsivity and expand the detection capabilities of violet phosphorus photodetectors.

    Main Methods:

    • Fabrication of a vertical tunnel junction device with thin-film violet phosphorus as the tunneling barrier and graphene as electrodes.
    • Characterization of the device's photoresponse under varying bias and gate voltages.
    • Analysis of photocurrent generation mechanisms for both visible and infrared light.

    Main Results:

    • The device achieved a light-to-dark current ratio over 2 × 10⁵ and a photoresponsivity of 0.58 A/W at 532 nm.
    • A photocurrent signal was observed even below the bandgap of violet phosphorus, indicating infrared detection capabilities.
    • Distinct temperature and polarization dependencies for visible and infrared responses suggest multi-mechanism photocurrent generation.

    Conclusions:

    • The gate-tunable vertical tunnel junction architecture effectively enhances violet phosphorus photodetector performance by reducing carrier recombination.
    • The device exhibits broad spectral detection, including infrared wavelengths, due to multiple photocurrent generation mechanisms.
    • This work paves the way for advanced, multi-wavelength optoelectronic devices based on violet phosphorus.