pi-conjuagted polymers_short_2005 - -conjugated polymers...

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1) π -conjugated polymers. What are they ? applications 4) Light emitting diodes 5) Solar cells π -conjugated polymers Α π -conjugated polymer: polyacetylene H H acetylene H H n n polyacetylene Extended π -orbitals in which electrons can move
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π -conjugated polymers N=2 N=4 π∗ π π∗ π π∗ π lumo homo bandgap N= lumo homo n poly(acetylene) poly(dimethoxyphenylene vinylene) OCH 3 CH 3 O n n poly(phenylene) E g = 2.1 eV E g = 1.0 eV E g = 1.5 eV E g = 1.9 eV E g = 3.0 eV poly(isothionaphthalene) S n poly(3-alkylthiophene) S R n poly(3 π - π * Band gaps of selected conjugated polymers
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Glass Indium tinoxide + Electroluminescent polymer Transparent conducting polymer Light Polymer light-emitting diode Philips Research University of Cambridge: Burroughes et al., Nature 1990, 347 , 539 Ca ITO: Indium tin oxide Hole Injection (oxidation of polymer) O O n Electron Injection (reduction of polymer) PLED band diagram E lumo homo Vacuum level =Energy of an electron in vacuum at infinte distance
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pi-conjuagted polymers_short_2005 - -conjugated polymers...

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