[HSOoi]

Hi there,

Silicone it self is not a conductor because it doesn't have free moving charged particles ( ions / electrons ).
We add elements such as "Boron" or "Phosphorus" into the silicone crystal and this process is called doping.
Doping process only takes place after the Silicone is in a crystal state. The impurities arrange themselves together according to the silicone's crystal.

And I am stuck here with these questions.

1. How can the impurities push themselves into the crystal?
2. Where did the original silicone go?
3. Their charges did not match. How can they even stayed together?

Because their charges did not match. Electrons are able to move and this helps to conduct electric current.

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Image below shows the structure of Silicone crystal with Phosphorus impurities.

[Enthalpy]

I'd almost ask "how did we remove impurities" from silicon... because a heavy doping is for instance 10²⁰ dopant atoms per cm³, or 0.2% impurities. Starting from silicon as pure as usual chemistry can deliver, crystallization over month timescale can reduce the impurity level to 10¹³/cm³. The remaining ones are boron, the hardest to remove by crystallization because of its atomic diameter and is a dopant, and oxygen, which comes from the melting pot but isn't a big worry and can be displaced later from the surface. Some carbon as well, which is acceptable.

Other dopants are introduced voluntarily, either during crystal growth (then as a uniform dopant) or locally, by diffusion from the surface (must be outdated) or by implantation of ions with an accelerator. Subsequent heat rearranges the crystal: dopants take normal locations in the crystal (from interstitial, they become substitutional). If silicon atoms must move away, they can fill previously void locations, or rearrange dislocations a bit, or move to the surface. It is known that doping silicon changes its volume. This can and does create stress, which is important when making mechanical parts like sensors.

SiliconE uses to designate a polymer, poly(dimethyl siloxane).

I didn't understand question 3. Can you reformulate it?

[HSOoi]

I didn't understand question 3. Can you reformulate it?

Question 3:
Their charges did not match. How can they even stayed together?

What I meant there is. If atoms are going to form covalent bond. Their valence electrons must match in some ways so that there are no more remaining electrons.
For example:

2Al + 3O₂  2Al₂O₃

Aluminium has 3 more valence electrons and Oxygen has -2 less valence electrons
The bonds they made is such a way that there are no more remaining electrons and this satisfy both of them.

But in the doping case.
Phosphorus bond with Silicone in such a way that Phosphorus has 1 extra electron outside.
How can that be possible?

[HSOoi]

By the way...

Silicon is not Silicone right?

[Enthalpy]

The fifth electron of phosphorus uses to go away from the ion. The ion brings then 4 electrons as silicon atoms do, thus fitting in the scheme.

Beware "covalent bond" is misleading. The shared 4 electrons make bonds as global as the crystal itself; they are not restricted to an atom pair.

This extra electron is then available for conduction, while the four aren't. Doped silicon conducts electricity much better than pure silicon would - provided we were capable of producing it.

If dopant concentration is big, or temperature very low, some fifth electrons can stay near the phosphorus ions, which attract them by their charge. "Near" means at a few atoms mean distance. One may call a "Rydberg atom" the ion +electron +neutral silicon atoms.