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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
