Lecture1a - Lecture 1. PHYSICS OF SEMICONDUCTORS Topics:...

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Lecture 1. PHYSICS OF SEMICONDUCTORS Objectives: Describe the physical structure of semiconductors Describe carrier motion Describe current components in semiconductors Topics: Materials structure, energy bands Impurities (dopants) Current flow in semiconductors
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Materials Used in Electronic Devices - semiconductors combined with metals and insulators What materials conduct electric current? ALL!!! (just apply enough voltage) Conductors – very little voltage is sufficient (even a few mV) Semiconductors – moderately low voltages (Example: CMOS circuits ~ 5V, TTL ~ 3.7V) Insulators – high voltage results in electrical breakdown (Example: arcing, lightning, etc) What is needed to maintain current in a material? We need charge carriers Current definition dt dq i = amount of charge carried per unit time
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atom core bonds free electron a) Apply electric field (attach voltage source) E b) Free electrons start moving and carry charges e - What is current direction? Always from `+` to `-`!!!
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Lecture1a - Lecture 1. PHYSICS OF SEMICONDUCTORS Topics:...

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