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Introduction to Semiconductors

- Electronic Devices and Circuits Lecture 1 - Introduction to Semiconductors - Outline Introductions/AnnouncementsHandouts: 1. General information, reading assignments (4 pages) 2. Syllabus3. Student info sheet (for tutorials, do/due in recitation tomorrow!) 4. Diagnostic exam (try it on-line) 5. Lecture 1 Rules and regulations (next foil) Why Semiconductors , devices, circuits? Mobile charge carriers in semiconductorsCrystal structures, bonding Mobile holes and electrons Dopants and doping Silicon in thermal equilibriumGeneration/recombination; nopo product no , po given Nd, Na; n- and p-types Drift Mobility Conductivity and resistivity Resistors (our first device) Clif Fonstad, 9/10/09 Lecture 1 - Slide 1 Comments/Rules and expectations Recitations: They re-enforce lecture.

¥ Concentration of conduction electrons " n ¥ Concentration of conduction electrons " p In thermal equilibrium: ¥ n=n o ¥ p=p o and n o =p o =n i (T) The intrinsic carrier concentration, n i, is very sensitive to temperature, varying exponentially with 1/T: In silicon at room temperature, 300 K: ! n i (T)"T 3/2 exp(#E g /2kT) A very important

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