E&S:Lecture 9

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Author:
dante01
ID:
154367
Filename:
E&S:Lecture 9
Updated:
2012-05-17 03:35:46
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midterm
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study
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  1. Photovoltaics
    • 1.Coversion of photons directly into flowing electrons
    • 2. Semiconductor technology
  2. What explains the differences in properties between metals and non-metals?
    The prescence of free electrons
  3. Metals
    • 1. High electrical and thermal conductivity
    • 2.Metallic lust;opaque solids
  4. Non-metals
    • 1. Low electrical and thermal conductivity
    • 2. Solids,liquids, or gases
  5. Doping
    adding small amounts of contaminants to the pure silicon structure
  6. p-n Junctions
    • 1. materials, excess electrons from the n side diffuse across the junction into the p side, and excess holes from the p side diffuse across the junction to the n side
    • 2. Storng permanent electrostatic field
  7. Pros/cons: Mono-crystalline
    • 1. Pro
    • -High efficiency
    • 2. Con
    • -Increased manufacturing cost caused by the supply shortage silicon
  8. Pros/cons: Poly-crystalline
    • 1. Pro
    • -High efficiency with respect to price
    • 2. Con
    • -Increased manufacturing cost caused by the supply shortage silicon
  9. Pros/cons: Amorphous(Thin-film type_
    • 1. Pro
    • -lowprice
    • 2. Con
    • -low efficiency

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