10-Major Smith - LATE -3080 Presentation (Major Smith)

10-Major Smith - LATE -3080 Presentation (Major Smith) -...

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Unformatted text preview: Organic Semiconductors Organic By Major Smith Objectives Objectives What are Organic Semiconductors? How are they made? How What are they good for? Overview Overview An organic semiconductor is any organic material that has semiconductor properties. There are two classes of organic semiconductors: charge-transfer complexes and linear backbone polymers. Have been used with inorganic semiconductors and now are being researched. Polymers Polymers Consists mostly of polyacetylene, polypyrrole, polyaniline and their derivatives. Physical composition leads to the development of LUMO (Lowest Unoccupied Molecular Orbital) and HOMO (Highest Occupied Molecular Orbital). Doped chemically, electrochemically or self doped. Polymers Polymers Early Works 1963 DE Weiss and coworkers 1963 reported high conductivity in polypyrrole. 1974 John McGinness and coworkers built and reported the voltagecontrolled organic-polymer switch. 1977 Shirakawa, Alan G. MacDiarmid, Alan J. Heeger reported high conductivity in polyacetylene which led to awarding of the 2000 Nobel prize in Chemistry. Organic polymer voltage-controlled switch created in 1974. Polymers Polymers Applications Flat Panel Displays using OLED’s Solar Panels Optical Amplifiers Transistors - OFET Charge-Transfer Complexes Charge An electron-donor–electron-acceptor complex, characterized by electronic transitions to an excited state in which there is a partial transfer of electronic charge from the donor to the acceptor. Made by pairing an electron donor molecule with an electron acceptor molecule. Superconductors can be made at low temperatures. Charge-Transfer Complexes Charge Early Works 1954 Bell Lab researchers and others report chargetransfer complexes 1962 a acceptor, tetracyanoquinodimethane (TCNQ) was reported. 1970 a donor, tetrahiafulvalene (TTF), was synthesized. 1973 A charge-transfer complex of (TTF)-(TCNQ) was discovered References References http://www.oec-europe.com/persp_overview.htm http://en.wikipedia.org/wiki/Conductive_polymers http://en.wikipedia.org/wiki/Charge_transfer_complex#cite_note-4 http://www.organicsemiconductors.com/ ...
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