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5.112 Principles of Chemical Science
Fall 2005
Professor Sylvia Ceyer
Professor Christopher Cummins
LECTURE 34
BONDING IN METALS AND SEMICONDUCTORS
I.
Dimensionality of Materials
II.
From Bonds to Bands
A. Bands for metals
1. Conduction band
2. Valence band
B. Conductor
C. Semiconductor
D. Insulator
E. Probability of electrons in C.B.
F. Intrinsic / Extrinisic Semiconductors
1. Intrinsic
2. Extrinsic
3. P-type semiconductor
4. N-type semiconductor
III. LED device
A. Direct bandgap material