E E 339 - CN1-Introduction(1)

E E 339 - CN1-Introduction(1) - Introduction Introduction 1...

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1 Introduction 1 1. “What starts here changes the world” 2. Better devices mean better video games (etc.) Why should you care? (top 5 reasons) 3. Where talking “nano” 4. It’s fun (or is that just me) 5. It’s part of a well rounded ECE education 2
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2 Solid-state devices typically consist of “semiconductors” (intermediate conductivity) in combination with metals (very high conductivity) and insulators (very low conductivity). What’s so special about semiconductors? Critically , the conductivity of the semiconductor(s) and/or semiconductor devices can be altered over orders of magnitude (!) by introduction of impurity atoms (called dopants) voltage/electric-field-induced charge carrier accumulation voltage/electric field induced charge carrier accumulation or depletion (switching!) incident light (optical detection, switching!) 3 Can even vary the type of charge (current) carrier : negatively charged electrons, or positively charged (quasi-particle) “holes” (to be discussed (TBD)) … which is what puts the “C” (for “complimentary”) in “CMOS” and the“B” (for “bipolar”) in “BJT”. Can vary conductivity very (!) quickly via application of
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E E 339 - CN1-Introduction(1) - Introduction Introduction 1...

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