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MrCU204

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The semiconductor's semiconductivity does not lie in how easy it is to conduct electricity but in whether it can be controlled. If it is not controllable, it can only act as a resistor.

Not all high-resistance objects can be converted into semiconductors, and not just any two metals can be welded together to form a thermocouple. I certainly don't object to this, because I really don't understand it.

Diamond is considered to be a higher grade semiconductor material, and it is said that spectrally pure water is non-conductive. So, has anyone tried to slowly condense ultra-pure water into single crystal ultra-pure ice and measure its dielectric constant, piezoelectric effect, magnetic permeability, bandgap width and electron mobility? !

maychang

[Not all high-resistance objects can be converted into semiconductors]

It is true that not all high-resistance objects can be converted into semiconductors.

[It is not possible to make a thermocouple by simply pressing and welding two metals together]

Wrong. Any two metals (even non-metals, such as graphite) connected together can become a thermocouple.

lugl4313820

It seems that no title is better than a title. The moderator also gave an in-depth response to this. I admire you!

maychang

[Diamond is considered a higher-grade semiconductor material]

It is not “believed” but actually a better semiconductor material. Bipolar transistors made of diamond are more resistant to high temperatures and have better frequency characteristics than silicon transistors.

maychang

[Diamond is considered a higher-grade semiconductor material]

Diamond is made of carbon. Carbon has many isomers, one is diamond, and the other common one is graphite. Only crystals with diamond structure can be used to make transistors, while graphite cannot. Silicon also has many isomers, and only silicon with diamond structure can be used to make transistors. In fact, silicon crystals with diamond structure are similar to diamonds, very hard, harder than the hardest steel and harder than quartz, and can only be cut with diamonds.

qwqwqw2088

Diamond is not conductive, but adding impurities can make it conductive.

Is this what Untitled is trying to express?

For something this hard, it's probably difficult to mix it.

MrCU204

qwqwqw2088 posted on 2023-11-3 10:59 Diamond is not conductive, but by adding some impurities, it can be made conductive. What does the title mean? For such a super hard thing, it is estimated that the doping is...

Pure silicon, like glass, has a molten state, but carbon is said to sublime directly.

That means that doping may only be done by ion introduction, or by allowing impurities to be introduced during the process of vapor deposition into crystals, right? !

MrCU204

maychang posted on 2023-11-3 10:47 [Diamond is considered to be a higher-grade semiconductor material] It is not "considered", but a better semiconductor material. ...

Organic matter is not resistant to high temperatures or radiation, but is there any future for its frequency and photoelectric properties? !

MrCU204

Carbon is a tetravalent element. Graphene, like diamond, is pure carbon, a single substance, not a mixture or compound.

Pure silicon is not conductive, but graphene can conduct electricity. But whether it can conduct electricity or not, it is an intrinsic body. The key is, will the conductivity of an intrinsic body be affected by an electric field? !

Once upon a time, polyacetylene was also a "big name", but to become a practical conductor, it has to be mixed with nano silver powder (please note, it is mixed, not doped). I wonder, can polyacetylene itself be used as a semiconductor material? !

MrCU204

If I wrap this glass tube with copper, can it become a "FET"? !

MrCU204

MrCU204 posted on 2023-11-16 00:33 If I wrap this glass tube with copper, can it become a "FET"? !

It should be said that it is an electrostatic induction bidirectional thyristor.

Electrostatic induction thyristors have existed for a long time, and may be out of date now, but there seems to be no bidirectional ones.