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Related Concept Videos

P-N junction01:11

P-N junction

1.6K
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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Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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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...
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Biasing of P-N Junction01:16

Biasing of P-N Junction

2.4K
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...
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Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
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Semiconductors01:22

Semiconductors

1.8K
There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
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Bipolar Junction Transistor01:22

Bipolar Junction Transistor

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Bipolar Junction Transistors (BJTs) are essential elements in electronic circuits, playing a crucial role in the functionality of amplifiers, memories, and microprocessors. These transistors can be designed as NPN or PNP based on their doping patterns. They consist of three layers: the emitter, base, and collector. The configuration of these layers and their respective doping levels—with N-type or P-type impurities—define the transistor's type and its operational...
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Color tunable monolithic InGaN/GaN LED having a multi-junction structure.

Duk-Jo Kong, Chang-Mo Kang, Jun-Yeob Lee

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    This summary is machine-generated.

    Researchers developed a novel three-terminal, multi-junction Indium Gallium Nitride/Gallium Nitride (InGaN/GaN) light-emitting diode (LED). This device enables tunable blue-green color emission by independently controlling its blue and green active regions.

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    Area of Science:

    • Semiconductor Physics
    • Optoelectronics
    • Materials Science

    Background:

    • Traditional light-emitting diodes (LEDs) often have fixed emission colors.
    • Achieving tunable color emission in monolithic devices presents significant fabrication challenges.

    Purpose of the Study:

    • To fabricate a monolithic, color-tunable InGaN/GaN LED with a multi-junction structure.
    • To enable independent control over blue and green active regions for versatile color emission.

    Main Methods:

    • Utilized metal organic chemical vapor deposition (MOCVD) for epitaxial growth.
    • Fabricated a three-terminal device with stacked blue and green multi-quantum well (MQW) active regions.
    • Designed an n-GaN / blue-MQW / p-GaN / green-MQW / n-GaN / Al2O3 structure.

    Main Results:

    • Successfully demonstrated a blue-green color-tunable monolithic InGaN/GaN LED.
    • Achieved independent control of the blue and green active regions.
    • Identified and explained three distinct operation modes: green, blue, and cyan.

    Conclusions:

    • The developed three-terminal multi-junction InGaN/GaN LED offers a pathway to tunable color emission.
    • Independent control of active regions is key to achieving versatile optical properties.
    • This technology has potential applications in displays and lighting requiring variable color output.