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Chapter 2. Organic semiconductor devices

Chapter 2. Organic semiconductor devices. Organic light-emitting diodes (OLED) Thin-film transistors (TFT) Photovoltaic cell (solar cell) Bio-sensor FRID tag. Organic Electronics. Light emitting diod (LED).

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Chapter 2. Organic semiconductor devices

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  1. Chapter 2. Organic semiconductor devices • Organic light-emitting diodes (OLED) • Thin-film transistors (TFT) • Photovoltaic cell (solar cell) • Bio-sensor • FRID tag

  2. Organic Electronics

  3. Light emitting diod (LED) An organic passive-matrix display on a substrate of polyethylene terephthalate, a lightweight plastic, will bend around a diameter of less than a centimeter. The 18-mm-thick, 5-by-10-cm monochrome display consists of 128 by 64 pixels, each measuring 400 by 500 µm, and is being operated at conventional video brightness of 100 cd/m2. It was fabricated by Universal Display Corp., Ewing, N.J., with a moisture barrier built into the plastic that prevents degradation of the pixels.

  4. Eastman Kodak and Sanyo Electric developed this active-matrix, full-color organic display, only 1.8 mm thick, for digital still and video cameras and other portable imaging products. With a 2.4-inch diagonal screen and integrated drive electronics, the bright display has 852 by 222 pixels, a contrast ratio of more than 250:1, and a peak luminance of 200 cd/m2.

  5. Work function: the energy needed to move an electron from the Fermi energy level into vacuum Ionization potential:the energy required to remove an electron from the isolated atom or ion Electron affinity: the energy given off when a neutral atom in the gas phase gains an extra electron to form a negatively charged ion

  6. Displays (OLED) • One of the biggest applications of organic transistors right now. Organic TFTs may be used to drive LCDs and potentially even OLEDs, allowing integration of entire displays on plastic. • Brighter displays • Thinner displays • More flexible

  7. Field effect transistor (FET) n-channel vs. p-channel Organic thin-film transistors (OTFTs) are constructed of an organic or inorganic gate insulator and an organic semiconducting channel linking the source and drain.

  8. Organic thin film transistor

  9. Pentacene

  10. photovoltaic cell The same device preparation procedure can be used to produce a photovoltaic cell, a device that converts light into voltage (or current). A solar cell, made from a monocrystalline silicon wafer

  11. Solar Cells • The light falls on the polymer • Electron/hole is generated • The electron is captured C60 • The electricity is passed by the nanotube

  12. Bio-sensor

  13. a b PCR-amplified DNA fragments Complementary probes (resulting in Au-np aggregation) Noncomplementary probes (preventing Au-np aggregation) Excess PCR primers

  14. RFID • Passive RF Devices that talk to the outside world … so there will be no need for scanners. • Quicker Checkout • Improved Inventory Control • Reduced Waste • Efficient flow of goods from manufacturer to consumer

  15. www.polyic.com What’s next For RFID? Chips Based On Printable Organic Semiconductors? “Cheap, smart, thin and eventually completely disposable.” Organic Semiconductor Conference program, Cambridge, UK, 2003

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