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Related Concept Videos

Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

367
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...
367
MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

527
Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...
527
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

575
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...
575
Biasing of FET01:22

Biasing of FET

394
Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the...
394
MOSFET01:16

MOSFET

680
The Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) plays a pivotal role in modern electronics thanks to its versatility and efficiency in controlling electrical currents. This device, also known as IGFET, MISFET, and MOSFET, has three main terminals: the Source, Drain, and Gate. MOSFETs are classified into n-channel or p-channel types based on the doping characteristics of their substrate and the source or drain regions.
In an n-MOSFET, the structure includes n-type source and drain...
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Biasing of P-N Junction01:16

Biasing of P-N Junction

1.1K
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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    Researchers developed an ultra-thin selective emitter for efficient radiative cooling. This affordable device achieves near-unity heat emission within the atmospheric window, overcoming limitations of complex, material-intensive structures.

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    Area of Science:

    • Photonics
    • Materials Science
    • Thermal Engineering

    Background:

    • Efficient radiative cooling requires selective emitters that minimize heat absorption while maximizing thermal emission within the atmospheric transparent window.
    • Existing selective emitters, often based on metamaterials or multi-stacking structures, face challenges in mass production due to complex fabrication and material requirements.

    Purpose of the Study:

    • To introduce an ultra-thin, near-unity selective emitter (UNSE) for efficient radiative cooling.
    • To develop a fabrication process that is simple and affordable, enabling mass production.

    Main Methods:

    • Engineered a resonant structure combining infrared (IR) lossy layers and a high-index lossless layer.
    • Achieved significant emissivity enhancement in the long-wavelength IR region.

    Main Results:

    • Demonstrated an ultra-thin (approximately 1 μm) selective emitter.
    • Attained near-unity emissivity within the atmospheric window.
    • Utilized a simple and affordable fabrication process.

    Conclusions:

    • The developed UNSE offers a promising solution for efficient radiative cooling.
    • The device's thin profile and cost-effective fabrication pave the way for practical, large-scale applications.
    • This work advances the field of passive cooling technologies.