2022-09-18 14:54 Status: # p type substrate  [^2] A very lightly doped section of p-type material. High electrical resistance means current cannot pass between source and drain if there is zero voltage on the gate. Applying a positive potential to the gate of an NMOS creates a strong electric field within the p-type and the holes in the region are repelled and electrons begin to fill the conduction band. [^1] --- # References [^1]: [Do It Poms](https://www.doitpoms.ac.uk/tlplib/semiconductors/mosfet.php#:~:text=The%20p%2Dtype%20doped%20substrate,zero%20voltage%20on%20the%20gate.) [^2]: [Image](https://www.zerotoasiccourse.com/Construction-of-MOSFET.png#invert)