Question

Explain your mental model of how n-doping of a semi-conductor works. Include any diagrams if useful.

Answer 1

How n-doping of a semi-conductor work? Any Doping is the process of adding impurities to intrinsic semiconductors to alter their propertion. Normally, Privalent and pentarelent elements are used to dope silicon and germanium for making and n-type respectively. it p-tyre =) whon Si Si nonce =) when we pop in a ponta valent element into the lattice. As you can see the image, we have doped the silicon laftice with phosphorous, a pentavalent element. Now penfaralent element has 5 electons, so it shares an election with each of the four neighbouring silicon atorm u elections are tied up with the silicon atoms in the lattice. This leaves an exha extron, This excen elechon is free to move and is responsible for conduction. Hence N-tyre extrinsic silicon Semiconductor is made. And, the free election in the semiconductor enhance the conductivity.