Lec03 Electrical Conduction _ Crystal Structure

Lec03 Electrical Conduction _ Crystal Structure - EECS 320...

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EECS 320 Electrical Conduction
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Electronic Devices We have just learned about electronic devices How do they work? How do they control electrical current/voltage? Let’s start with examining electrical current flow in a solid material Anode Cathode +- Gate Drain Source I V
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Response of Electron to Electric Field What happens to an electron when we apply a voltage/electric field? E dt dv m q 0 Force = = E m 0 =electron rest mass q=charge on an electron (amplitude, 1.6x10 -19 C) =electric field v=velocity (“-” sign for electron) What happen when the electron is in vacuum?
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Scattering Events Determine Electron Velocity What happen when the electron is in a solid? E Carriers are accelerated by electric field Carriers scatter from imperfections in material Average electron velocity for a given electric field We need to determine the average velocity-electric field relation for a given material!
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Ohm’s Law Voltage across resistor is proportional to current I IR V = I V R = V Resistance: ability to resist flow of electric current l V +- A l A l R σ ρ = = I Units of ρ , σ ? You will encounter CGS (cm-g-s) unit a lot! ρ= resistivity A σ= conductivity Resistivity and conductivity are material parameters Looks like should be related to average electron velocity
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Can We Relate Conductivity and Velocity?
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Lec03 Electrical Conduction _ Crystal Structure - EECS 320...

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