lecture11

lecture11 - 6.720J/3.43J - Integrated Microelectronic...

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

View Full Document Right Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 6.720J/3.43J - Integrated Microelectronic Devices - Spring 2007 Lecture 11-1 Lecture 11 - Carrier Flow (cont.) March 1, 2007 Contents: 1. Dynamics of majority-carrier-type situations 2. Dynamics of minority-carrier-type situations Reading assignment: del Alamo, Ch. 5, 5.4 Cite as: Jess del Alamo, course materials for 6.720J Integrated Microelectronic Devices, Spring 2007. MIT OpenCourseWare (http://ocw.mit.edu/), Massachusetts Institute of Technology. Downloaded on [DD Month YYYY]. 6.720J/3.43J - Integrated Microelectronic Devices - Spring 2007 Lecture 11-2 Key questions What is the characteristic time constant of majority-carrier-type stuations? What is the characteristic time constant of minority-carrier-type situations? Always? Cite as: Jess del Alamo, course materials for 6.720J Integrated Microelectronic Devices, Spring 2007. MIT OpenCourseWare (http://ocw.mit.edu/), Massachusetts Institute of Technology. Downloaded on [DD Month YYYY]. 6.720J/3.43J - Integrated Microelectronic Devices - Spring 2007 Lecture 11-3 1. Dynamics of majority-carrier-type situations Continuity equation for net volume charge: J t = x t Under static conditions: = 0 J t = 0 J t uniform in space t x Under dynamic conditions: = 0 charge redistribution t J t = 0 charge ow x eventually: 0, sample quasi-neutral again How long does it take for quasi-neutrality to be restablished? Answer: Dielectric relaxation time [see AT5.1 in notes]: d = Hence, for t d : J t 0 x Cite as: Jess del Alamo, course materials for 6.720J Integrated Microelectronic Devices, Spring 2007. MIT OpenCourseWare (http://ocw.mit.edu/), Massachusetts Institute of Technology. Downloaded on [DD Month YYYY]. 6.720J/3.43J - Integrated Microelectronic Devices - Spring 2007 Lecture 11-4 Dielectric relaxation time d = Depends on doping level: The higher the doping level, the faster quasi-neutrality is established after a perturbation....
View Full Document

Page1 / 13

lecture11 - 6.720J/3.43J - Integrated Microelectronic...

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