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Related Concept Videos

Schottky Barrier Diode01:27

Schottky Barrier Diode

331
Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...
331
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

332
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
332
Biasing of P-N Junction01:16

Biasing of P-N Junction

505
The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
505
P-N junction01:11

P-N junction

510
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...
510

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Related Experiment Video

Updated: Jun 22, 2025

Fabrication of Schottky Diodes on Zn-polar BeMgZnO/ZnO Heterostructure Grown by Plasma-assisted Molecular Beam Epitaxy
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Schottky-contact intrinsic current blocking layer for high efficiency AlGaInP-based red mini-LEDs.

Shengjun Zhou, Lang Shi, Siyuan Cui

    Optics Letters
    |July 1, 2024
    PubMed
    Summary

    A novel Schottky-contact current blocking layer (SCBL) improves current spreading in AlGaInP red mini-LEDs. This enhancement boosts external quantum efficiency (EQE) by 31.8% for advanced display applications.

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    Area of Science:

    • Optoelectronics
    • Semiconductor Devices

    Background:

    • AlGaInP-based red LEDs are crucial for full-color displays.
    • Vertical chip configuration is standard for these LEDs.
    • Current crowding around the p-electrode limits efficiency.

    Purpose of the Study:

    • To introduce a Schottky-contact current blocking layer (SCBL) for AlGaInP red mini-LEDs.
    • To improve current spreading and light extraction efficiency.
    • To overcome limitations of conventional vertical mini-LED structures.

    Main Methods:

    • Fabrication of mini-LEDs with and without SCBL.
    • Utilizing the Schottky contact between ITO and p-GaP for current blocking.
    • Employing the transfer length method to characterize ITO/p-GaP Schottky and ITO/p-GaP+ ohmic contacts.

    Main Results:

    • The SCBL effectively hinders current crowding around the p-electrode.
    • Current is redirected to inject through a p-GaP+ ohmic contact layer, reducing light absorption.
    • Mini-LEDs with SCBL demonstrated a 31.8% increase in external quantum efficiency (EQE) at 20 mA compared to devices without SCBL.

    Conclusions:

    • The SCBL is a viable strategy to enhance current spreading and light extraction in AlGaInP red mini-LEDs.
    • This approach offers a pathway to improved performance for next-generation displays.
    • The study validates the effectiveness of SCBL in boosting mini-LED efficiency.