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Replicate the first experiment showing SiC led effect

wallpapers News 2021-08-31
The use of silicon carbide (SiC) power semiconductors in everything from electric cars to solar photovoltaics and industrial engines is accelerating, but where did the material come from? What's so special about it? Why did it take so long for silicon carbide to find favor in the semiconductor industry when it was first used as the base material for radio detectors more than a century ago?
Replicate the first experiment showing SiC led effect
We may never have noticed silicon carbide existed, but in 1891, The American inventor Edward G Acheson was trying to find a way to produce synthetic diamonds by heating clay (aluminum silicate) and carbon. He noticed glowing hexagonal crystals attached to a carbon-arc lamp used for heating, called composite emery, which he thought was a form of crystalline alumina similar to corundum. He probably thought he was second best because rubies and sapphires are corundum types, but he realized he had something new. The compound is almost as hard as a diamond and can be present on an industrial scale as a fragment or powder. Production. Abrasive.
SiC LEDs are ahead of transistors
In the early 20th century, experimentarians discovered that crystals of various substances, including germanium, could produce "asymmetric currents" or rectifiers, a discovery that has been applied to "crystal" radios. Something strange happens when you try to use silicon carbide. The crystals emit yellow light, sometimes green, orange or even blue. The first LED was discovered 40 years before the transistor.
Silicon carbide was rapidly replaced by gallium arsenide and gallium nitride as LEDs, and its luminescence performance was improved 10-100 times. However, as a material, SiC is still of great interest in electronics. It has 3.5 times the thermal conductivity of silicon and can achieve high electrical conductivity while maintaining a high electric field breakdown. Mechanically, it is very hard, inert, and has a very low coefficient of thermal expansion and a high-temperature rating. SiC doesn't even melt -- it sublimates at about 2,700 °C.