Khaled Zeyada 🇵🇸 from Rafah on Nostr: Phosphorus is added to one layer of silicon. It adds many extra electrons, and it ...

Phosphorus is added to one layer of silicon. It adds many extra electrons, and it makes the layer of silicon negative-type. Phosphorus comes from mining, or also from guano (seabird excrements).

Boron is added to the other layer of silicon. It adds many electron holes (places where electrons are missing). It makes the layer positive-type. Boron is a mined mineral.