EE40 Lecture 18 – Diodes

EE40 Lecture 18 – Diodes - EE40 Lecture 18...

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Unformatted text preview: EE40 Lecture 18 Diodes Neel Shah 8/8/11 Class Final this Friday, 8/12, in-class Start at 12.05 pm, end at 1.55 pm, open book/notes Calculator required, no cell phones, internet, etc. HW6, HW4 regrades, extra credit due this Wednesday 8/10 Today is the final iClicker day click away for extra credit! bSpace will be updated with the right scores, but quite frankly it is not a high priority right now Neels Wed/Fri OH cancelled Neels Thursday review session: 10 AM - 12, Cory 521 Also Wed 8/10 lecture is open Q&A, email me with requests for topics to cover The final will be comprehensive to some degree, so questions on any of the material this session are welcomed Before we get into diodes Semiconductor devices such as diodes and transistors are made of silicon In particular they are made of doped silicon Our MOSFET had two strong n-doped wells in a weak p-doped substrate + V C- - - - - - - - - - - - - (Drain) (Source) (Gate) +- Before we get into diodes Silicon doesnt conduct very well, but if we dope it with impurities it becomes a conductor P-doping refers to doping silicon with an atom with fewer valence electrons (i.e. boron) N-doping refers to doping silicon with an atom with more valence electrons (i.e. phosphorus) These asymmetries result in positive or negative charge carriers that are free to conduct We add lots of these impurities to get tons of conducting charges Before we get into diodes 1. A normal silicon crystal Thanks, Ali Javey! Before we get into diodes 2. A p-doped silicon crystal Thanks, Ali Javey! Before we get into diodes 3. An n-doped silicon crystal Thanks, Ali Javey! Before we get into diodes Typical doping densities: 10 16 ~10 19 cm-3 Atomic density for Si: 5 x 10 22 atoms/cm 3 Dopant concentration of 10 18 cm-3 is 1 in 50,000 Doping is like Two people in all of Berkeley wearing a green hat What is a diode?...
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EE40 Lecture 18 – Diodes - EE40 Lecture 18...

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