PN junction diode | Depletion region | Potential barrier

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What is Semiconductor????
https://youtu.be/7UOD-mfPMKk

Intrinsic and Extrinsic Semiconductor (Comparison)_
https://youtu.be/lsvq40YP8r0

p type and n type semiconductor_
https://youtu.be/7AMPZorJopw