Chapter21_22_Crystal

Chapter21_22_Crystal - Chapter 2 Semiconductor Device...

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Chapter 2 – Semiconductor Device Physics Fundamentals 2.1 Semiconductor Materials 2.2 Crystal Structure 2.3 Semiconductor Models 2.4 Semiconductor Doping 2.5 Carrier Statistic 2.6 Carrier Transport 2.7 Carrier Generation/Recombination Literature: Pierret, Chapter 1-3, page 1-132 Sze, Chapter 1-3, page 1-83 Slides courtesy of Prof. Oliver Brand
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2 2.1 Semiconductor Materials Material Classification by Resistivity : Literature: Pierret, Chapter 1.1, page 3-6 Material Resistivity ρ [ Ω· cm] Insulators 10 5 < ρ Semiconductors 10 -3 < ρ < 10 5 (–10 8 ) Conductors ρ < 10 -3 Jaeger, Blalock, Table 2.1
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3 Semiconductor Materials Semiconductors have conductivities between those of insulators and those of conductors Semiconductors are materials whose electric properties (e.g. conductivity & resistivity) can be controlled over a wide range by doping , i.e. addition of controlled amounts of specific impurity atoms Semiconductor materials are the base of all semiconductor devices, such as diodes and transistors (BJT and MOSFET) Pierret, Fig. 3.8
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4 Resistivity/Conductivity of Insulators, Semiconductor and Conductors Sze, Fig. 2.1
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5 What Elements are Semiconductors based on? Elemental Semiconductors: Silicon (Si), Germanium (Ge) Compound Semiconductors: III-V: e.g. Gallium Arsenide (GaAs) II-VI: e.g. Zinc Selenide (ZnSe) IV-IV: Silicon Carbide (SiC) Alloy Semiconductors: Binary: Si 1-x Ge x Ternary: Al x Ga 1-x As Al x In 1-x As GaAs 1-x P x Quaternary: Ga x In 1-x As 1-y P y Because of its well-developed fabrication technology, SILICON is by far the most important semiconductor material Jaeger, Blalock, Table 2.2 Shaded = most important semiconductor elements
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Element and Compound Semiconductors
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Chapter21_22_Crystal - Chapter 2 Semiconductor Device...

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