lecture2 - 6.720J/3.43J- Integrated Microelectronic...

Info iconThis preview shows pages 1–6. 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

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 2-1 Lecture 2- Carrier Statistics in Equilibrium February 8, 2007 Contents: 1. Conduction and valence bands, bandgap, holes 2. Intrinsic semiconductor 3. Extrinsic semiconductor 4. Conduction and valence band density of states Reading assignment: del Alamo, Ch. 2, 2.1-2.4 (2.4.1) Announcement: Go to http://ilab.mit.edu and register. Select member ship in the 6.720 group. You will need this to access the lab for the Device Characterization Projects. 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 2-2 Key questions What are these energy band diagrams? What are these holes? In a perfectly pure semiconductor, how many electrons and holes are there? Can one engineer the electron and hole concentrations in a semi conductor? 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 2-3 1. Conduction and valence bands, bandgap, holes energy E c conduction band valence band E c bandgap E g E v E v space coordinate Conduction and valence bands: bonding electrons occupy states in valence band free electrons occupy states in conduction band holes : empty states in valence band CB electrons and VB holes can move around: carriers + +-- a) a) b) c) b) c) 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 2-4 electron energyelectron energy hole energyhole energy E c E v ---- + + + + Elements of energy band diagrams: at edges of bands, kinetic energy of carriers is zero electron energies increase upwards hole energies increase downwards electron energyelectron energy h = Eg = Eg h > > Eg Eg -- + +- + h > Eg > Eg a) b) E c E v 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 2-5 2. Intrinsic semiconductor Define intrinsic semiconductor , or ideal semiconductor: perfectly crystalline (no perturbations to periodic lattice)...
View Full Document

This note was uploaded on 09/24/2010 for the course EECS 6.720J taught by Professor Jesúsdelalamo during the Spring '07 term at MIT.

Page1 / 17

lecture2 - 6.720J/3.43J- Integrated Microelectronic...

This preview shows document pages 1 - 6. Sign up to view the full document.

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