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This is were the action is - in 2007. Organic
semiconductors are hot topics in R&D, and first products in the form of OLED's are on the market.
RFID's may or may not follow soon. |
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Materials Science and technology for organic conductors and semiconductors is
far from being well understood and there are major technological challenges, too. To give just one example: Oxygen, quite
ubiquitous
in air, is deadly for organic semiconductor devices. How can you keep a (cheap) device absolutely airtight for 20
years or so? |
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But first things first: What exactly are organic semiconductors? |
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There is no simple answer. Essentially you need two ingredients: Some organic molecule with
a conjugated carbon-carbon chain. This means that there is a
succession of "single bond - double bond", i.e. –C=C–C=C–C=C–C=C– with all
kinds of stuff on the one remaining free valence of any C atom. There also must be some "doping" because
the conjugated backbone chain of the polymer molecule is (surprisingly?!) not conductive or semi-conductive. |
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Doping is written in quotation marks because
it has nothing to do with what we have learned about doping in Si - except that you add some impurities to your semiconductor. |
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We will come back to this topic later (if there is time). Meanwhile you may activate
the folllwing links: |
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© H. Föll (Semiconductor Technology - Script)
