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Related Concept Videos

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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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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Related Experiment Video

Updated: May 5, 2026

Evaluating Plasmonic Transport in Current-carrying Silver Nanowires
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Photocurrent limit in nanowires.

Bruno Ullrich, Haowen Xi

    Optics Letters
    |December 11, 2013
    PubMed
    Summary

    Researchers uncovered a new method to analyze semiconductor nanowires. This technique accurately determines impurity concentration and electronic response times by analyzing photocurrent behavior under varying light intensities.

    Area of Science:

    • Materials Science
    • Condensed Matter Physics
    • Nanotechnology

    Background:

    • Photocurrents in semiconductor nanowires exhibit complex dependencies on light intensity.
    • Existing literature often reports square root dependencies without fully explaining the underlying limiting effects.

    Purpose of the Study:

    • To derive a theoretical relation that accurately describes the nonlinear photocurrent behavior in nanowires.
    • To demonstrate the practical application of this relation in determining key material properties.

    Main Methods:

    • Theoretical derivation of a photocurrent-light intensity relationship for nanowires.
    • Experimental validation using nano-sized semiconductor samples.
    • Analysis of fit parameters to extract material characteristics.

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    Main Results:

    • A novel relation was derived, providing an excellent fit to observed nonlinear photocurrent dependencies.
    • The fit parameters were shown to be directly correlated with impurity concentration.
    • The electronic response time of the nanowires could be accurately determined from the fit parameters.

    Conclusions:

    • The derived relation successfully clarifies the limiting effects in nanowire photocurrents.
    • This work provides a powerful, non-destructive method for characterizing semiconductor nanowires.
    • The findings are significant for the development and application of nano-electronic devices.