Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

PN junction's behavior near corners

  1. Mar 17, 2017 #1
    Hey all,

    Consider a general 2D configuration of a P+N junction where a small P+ material rectangle is placed upon a much larger N-material rectangle. So, the interface between the P+ and the N comprises a flat boundary line terminated on each side by a right-angled corner (hope I'm being clear enough). My question is how to find the depletion region's profile on the N side (shape and width) near these corners.

    The depletion region along the flat boundary interface follows the simple 1D Poisson's eq. analysis, which is no longer valid when approaching the corner area.

    Any idea on how to formulate an analytic expression for the depletion region around corners?

    Thanks a Bunch
  2. jcsd
  3. Mar 22, 2017 #2
    Thanks for the thread! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post? The more details the better.
  4. Mar 23, 2017 #3


    User Avatar
    Science Advisor
    Gold Member

    The depletion zone is where the diffusion potential is balanced by the electrostatic potential, so you need to calculate both a potential and a streamline (for the diffusion current). You may be able to compute them both using conformal mapping-- in particular, the Schwartz-Christoffel transform. This will involve elliptic integrals so you need to decide how important it is to have an analytic va. numeric answer.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted

Similar Threads - junction's behavior near Date
Bizarre Behavior in Discrete PMOS Jan 27, 2018
P-n junction built in voltage Jul 6, 2016
Depletion zone and current in forward-biased PN junction Jan 30, 2016