11 - PN junction electrostatics

11 - PN junction electrostatics - EECS 320 P-N Junction...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
EECS 320 P-N Junction Electrostatics J. Phillips EECS 320 Diode It is desirable to have a rectifying device i.e., A one way valve Easy flow Difficult flow Forward direction Reverse direction Need a physical junction for such a device
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
J. Phillips EECS 320 Diode For electronics, need a one way valve for current Ideal behavior: • How do we implement in a semiconductor? • Vary spatial composition (e.g. doping) I V N P J. Phillips EECS 320 Joining P-type and N-type What happens when you join p-type and n-type material? PN e - diffuse h + diffuse Ionized acceptors Ionized donors E Diffusion drives e’s and h’s to lower concentration regions Ionized dopants remain, creating an electric field Under equilibrium, diffusion and drift processes are balanced
Background image of page 2
J. Phillips EECS 320 Energy Band Picture J. Phillips EECS 320 Energy Band in Equilibrium
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
J. Phillips EECS 320 Energy Band Diagram P N V bi E V E C E F E vac E C E V q φ p p-type n-type E f E vac E C E V E f q φ n q χ E G J. Phillips EECS 320
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 9

11 - PN junction electrostatics - EECS 320 P-N Junction...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online