Conductance and Conductivity
Electrical conductance measures how easily electricity flows
through a bar or wire made out of conducting material.
The conductance G of an object of cross-sectional area A and length
L can be determined from the material's

Announcement
There will be a Quiz (Quiz #2) on Tuesday, October 11
Quiz #2 will cover Lecture #8 to Lecture #14
Homework #2 Solution has been posted in the Blackboard
ELCT 363: Intro. to Microelectronics
Mandal/Fall 2011
Lecture 15; Slide
1
Concept of k-S

Announcement
Homework #2 is due today
Midterm will be on Thursday, October 27th
Closed-books/Closed-notes exam, but you may bring a face page
of equations or notes
No cell phones/smart phones are allowed (no texting or web
browsing)
Exam will cover Lectur

Fermi level in n-type semiconductor
Extra free electron
Phosphorus (P)
has 5 outer
shell electrons.
In the n-type material most of
the mobile charges are free
electrons.
Therefore, the average
energy of mobile charges is
close to EC:
EC
EFn
EFi
EV
EF EC
E

Announcement
Homework #2 is posted in the Assignment
section of the Blackboard.
Due date is : October 4, 2011
ELCT 363: Intro. to Microelectronics
Mandal/Fall 2011
Lecture 12; Slide
1
Doped Semiconductors
Donor dopants n-type semiconductor the most of

Carrier Concentration
Neamen, Chapter 4
ELCT 363: Intro. to Microelectronics
Mandal/Fall 2011
Lecture 11; Slide
1
Determination of Electron Concentration using Fermi
Distribution Function
exp
( E EF )
kT
if (E - E F ) > kT
Concentrations of electrons/ ho

Energy Band Structure (summary)
Semiconductors have allowed bands of energy levels. Only these energy
levels or bands may be filled with electrons .
The energy bands between these allowed bands are called forbidden bands;
electron can not stay in these

Solution to Homework 1
PROBLEM No 1- Assuming each atom is a hard sphere and in contact
with the surface of its nearest neighbor, find out (a) number of atoms
per unit cell, (b) volume density and (c) packing fraction of the body
centered cubic lattice.
S

Energy Band
Neamen, Chapter 3
ELCT 363: Intro. to Microelectronics
Mandal/Fall 2011
Lecture 8; Slide
1
Energy Band
When isolated atoms are brought together to form a solid, various interactions
occur between neighboring atoms. Attraction and repulsion is

Announcements
Homework Assignment #1 is due Today.
Quiz #1 (5% toward final grade) will be on
next Tuesday, September 13, covering the
course lectures until today (September 8).
ELCT 363: Intro. to Microelectronics
Mandal/Fall 2011
Lecture 7; Slide 1
Ep

Announcements
Homework #1 is posted on the Blackboard
Homework Assignment #1 is due on
Thursday, September 8
There will be a Quiz #1 (5% toward final
grade) on next Tuesday, September 13,
covering the course lectures until September
8.
ELCT 363: Intro.

Crystal Lattice
Neamen: Chapter 1
ELCT 363: Intro. to Microelectronics
Dr. Mandal/Fall 2011
Lecture 5; Slide
1
Structure of Solids
Charge transport through a semiconductor depends not only on the
properties of electron but also on the arrangements of ato

Solution to Assessment Quiz
1. Units and dimensions:
(a) Unit of charge is Coulomb
(b) The unit of electric power is Watt or Joule per second
(c) Unit of energy is Joule
(d) 30 C is equal to
(0C 273 K) 30C 30 + 273 = 303 Kelvin
(e) 10 m = 1000 cm = 107 m