Semiconductor diode
This presentation is the property of its rightful owner.
Sponsored Links
1 / 8

Semiconductor diode PowerPoint PPT Presentation


  • 97 Views
  • Uploaded on
  • Presentation posted in: General

Semiconductor diode. A semiconductor device model. Introduction. The diode is the classical semiconductor device, and is mainly used as a rectifier From a modeling perspective the device has a well known theoretical behavior, so it often serves as a benchmark structure for device simulations

Download Presentation

Semiconductor diode

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Semiconductor diode

Semiconductor diode

A semiconductor device model


Introduction

Introduction

  • The diode is the classical semiconductor device, and is mainly used as a rectifier

  • From a modeling perspective the device has a well known theoretical behavior, so it often serves as a benchmark structure for device simulations

  • A simple implanted diode structure have been modeled in COMSOL Multiphysics, and analyzed using stationary and transient analysis

  • In particular, the electrical IV-characteristic, and the reverse recovery is studied


Model definition geometry

Model Definition – Geometry

  • The geometry is a cross-section of the diode, using depth of 1 µm of the implanted pn-junction


Model definition equations

Model Definition – Equations

  • The Poisson equation is coupled with the drift-diffusion equations for electrons and holes:

  • Electrons and holes assume to have a Boltzmann distribution, which is an approximation for the Fermi-Dirac distribution

  • Shockley-Reed-Hall recombination is present inside the semiconductor


Model definition mesh

Model Definition – Mesh

  • The mesh have to be dense near the pn-junctions and in the transition between the lowly doped and highly doped n-type regions


Results

Results

  • The electrical IV-characteristics can be used to extract the diode’s ideality factor, on-resistance, and saturation current


Results1

Results

  • A surface plot in log scale of the hole concentration reveals that the diode has entered high-level injection at 0.2 mA forward current


Results2

Results

  • The transient simulation studies the transition from the high-level injection state at forward bias to the blocked state in reverse bias

  • The diode reach a high reverse voltage with a high current, maximizing the risk of failure due to the large dissipated power


  • Login