Why is NMOS substrate lightly doped?

Discussion in 'General Electronics Chat' started by Simon-circuit, Sep 12, 2016.

  1. Simon-circuit

    Thread Starter New Member

    Sep 12, 2016
    2
    0
    I have been confused by this question: why is NMOS substrate lightly doped? Why is it necessary for MOSFETs but not for TFTs? Can anybody help me? Thanks!
     
  2. dl324

    Distinguished Member

    Mar 30, 2015
    3,211
    619
    Welcome to AAC!

    Different manufacturing techniques.

    TFT's are made by depositing material on an insulator and the insulator provides isolation for the transistors.

    For IC's, all of the transistors are produced on the same substrate and devices need to be separated by the relatively high resistance of the substrate and by putting implants between transistors to isolate them.
     
    Simon-circuit likes this.
  3. Simon-circuit

    Thread Starter New Member

    Sep 12, 2016
    2
    0
    Thanks for your reply! Is it that a p-n junction is formed between an nMOS and a pMOS so that there is an energy barrier to decrease the carrier flow between the two components, and also between the components and the substrate?
     
Loading...