Lesson 26 - Polymers in Electronics

Lesson 26 - Polymers in Electronics - Fundamentals and...

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Fundamentals and Applications of Organic Electronic Materials Jiangeng Xue Department of Materials Science and Engineering University of Florida ue@mse.ufl.edu uest lecture for EMA3066 ( jxue@mse.ufl.edu ) Guest lecture for EMA3066 Nov. 9, 2010
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Outline • Introduction to semiconductors troduction to organic electronic materials Introduction to organic electronic materials • Bonding and energy levels in organic materials • Charge transport and excitons in organic semiconductors • Organic light-emitting devices Organic photovoltaic cells • Conclusion Jiangeng Xue
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Semiconductors • Conductors – Materials that can easily carry electricity – Examples include many metals (such as Cu, Au, Ag, Al) and some eavily doped oxides (ZnO:Al ITO) heavily doped oxides (ZnO:Al, ITO) • Insulators – Materials that cannot carry electricity – Examples: plastics, rocks, dry wood, glass • Semiconductors lectrical conductivity falls in between conductors and insulators – Electrical conductivity falls in between conductors and insulators, and can be modulated over several orders of magnitude by doping, injection from electrodes, or photo excitation here exists a “band gap” of 0 5 5 eV (1 eV = 1 6 0 -19 ) etween There exists a band gap of 0.5-3.5 eV (1 eV = 1.6 10 J) between filled states (valence band) and empty states (conduction band) – Foundation of modern electronics and optoelectronics Jiangeng Xue More on semiconductors, see EMA 3413 -- “Electronic Properties of Materials”, Spring 2011
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Conventional (Inorganic) Semiconductor Materials and Devices Elemental semiconductors: Si, Ge Integrated cicuits Compound semiconductors: GaAs, InP, In x Ga 1 x N, ZnSe, CdTe, etc. Silicon wafers Photovoltaic (solar) cells Light emitting i d (LED ) Consumer Electronics diodes (LEDs) Jiangeng Xue
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Next Next-Generation Electronic and Generation Electronic and ptoelectronic Devices Optoelectronic Devices Faster Larger Cheaper Lighter Foldable Unbreakable rintable Printable (Semi-)Transparent ulti- nctional Jiangeng Xue Multi functional ……
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Scientific Interest in Organic Materials 1828 - Wöhler first synthesized urea without the assistance of a living organism 950’s - eady work on crystalline organics starts 1950 s steady work on crystalline organics starts 1970’s – conducting polymers and organic photoconductors (xerography) 1980’s - organic non-linear optical materials 1986 - Kodak group reported the first efficient organic solar cell 1987 - Kodak group reported the first efficient organic light emitting device (OLED) nce then the field has dramatically expanded both Since then, the field has dramatically expanded both commercially and scientifically (OLEDs, transistors, solar cells, lasers, modulators, . .. ) to date, about two million organic compounds have been made - this constitutes nearly 90% of all known materials this constitutes nearly 90% of all known materials -
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lan J Heeger niversity of California at Santa Barbara USA Nobel Prize in Chemistry for 2000 Alan J. Heeger, University of California at Santa Barbara, USA, Alan G. MacDiarmid,
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This note was uploaded on 11/16/2011 for the course EMA 3066 taught by Professor Douglass during the Fall '10 term at University of Florida.

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Lesson 26 - Polymers in Electronics - Fundamentals and...

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