12-Cha-presentation

12-Cha-presentation - Sigma and Pi bondings Resulting in...

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Conjugated Polymer Organic Semiconductor ECE3080 Jeongwon Cha 11/30/2004
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Contents What is conjugated polymer? History of conducting polymer Bonding Bandgap Conductivity Organic transistor
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What is conjugated polymer? Organic Carbon backbone Oxygen, hydrogen, or nitrogen Semiconductors Emits light Generates currents upon absorbing light Transistor Amplifier Band gaps - 1.2 eV to 3 eV
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Advantages and disadvantages Advantages Low cost Flexibility Disadvantages Density Speed
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History of conjugated polymers Prior to 1970s All synthetic polymers were insulators. In 1978, Conducting polymer as a poor metal Alan Heeger, Hideki Shirakawa, and Alan MacDiarmid received Nobel prize
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Bonding with 2 molecules Hybridization 2s orbital and 2p orbital in carbon
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Bonding with 2 molecules
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Unformatted text preview: Sigma and Pi bondings Resulting in double bonds Bonding with 3 molecules Hybridization 2s orbital and 2p orbital in carbon Delocalization Sigma bonding Pi bonding Delocalization Resonance Delocalization Bonding and anti-bonding 2 electrons in phase form bonding Lower energy 2 electrons out of phase form anti-bonding Higher energy Can be empty Bandgap Pi bondings form conduction band Pi anti-bondings form valence band Conductivity - oxidation An electron is removed from the highest pi orbital The positive charge (polaron) can move along the polymer chain Oxidants I2, FeCl3 Organic transistor Organic Thin Film Transistor ( p-type ) Off On Questions?...
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12-Cha-presentation - Sigma and Pi bondings Resulting in...

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