Organic Semiconductor Technology

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  • 1. ORGANIC TRANSISTOR TECHNOLOGY SAMI UR REHMAN 1
  • 2. Thin-film transistor (TFT) Sony Technology• Video link: http://www.youtube.com/watch?v=mtLfJ-mFsA8 SAMI UR REHMAN 2 (sami-rehman.blogspot.com)
  • 3. Organic Vs Inorganic Semiconductors• Silicon based inorganic  Polymer based organic material material• Covalently bonded Van der Waals bonded crystals crystals SAMI UR REHMAN 3 (sami-rehman.blogspot.com)
  • 4. Advantages of organic electronics• Organic electronics are lighter, more flexible• Low-Cost Electronics – No vacuum processing – No lithography (printing) – Low-cost substrates (plastic, paper, even cloth…) – Direct integration on package (lower insertion costs) SAMI UR REHMAN 4 (sami-rehman.blogspot.com)
  • 5. Comparison of organic and Si based technologies Organic Electronic Silicon Cost $5 / ft2 $100 / ft2 Fabrication Cost Low Capital $1-$10 billion Device Size 10 ft x Roll to Roll < 1m2 Material Flexible Plastic Substrate Rigid Glass or MetalRequired Conditions Ambient Processing Ultra Cleanroom Process Continuous Direct Printing Multi-step Photolithography Courtesy: Sara Saedinia University of California, Irvine SAMI UR REHMAN 5 (sami-rehman.blogspot.com)
  • 6. Disadvantages of organic technology• Conductive polymers have high resistance and therefore are not good conductors of electricity.• Because of poor electronic behavior (lower mobility), they have much smaller bandwidths.• Shorter lifetimes and are much more dependant on stable environment conditions than inorganic electronics would be. SAMI UR REHMAN 6 (sami-rehman.blogspot.com)
  • 7. 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 SAMI UR REHMAN 7 (sami-rehman.blogspot.com)
  • 8. Solar Cells • The light falls on the polymer • Electron/hole is generated • The electron is captured C60 • The electricity is passed by the nanotube SAMI UR REHMAN 8 (sami-rehman.blogspot.com)
  • 9. Organic Thin Film Transistors (OTFTs) Organic material Organic material SAMI UR REHMAN 9 (sami-rehman.blogspot.com)
  • 10. An Example of an I-V of OTFTs Lg = 20 µm W = 220 µm 400 nm SiO2 50 nm organicCourtesy: 10
  • 11. Equipment and materials SAMI UR REHMAN 11 (sami-rehman.blogspot.com)
  • 12. PEDOT:PSS• PEDOT:PSS or Poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) is a polymer mixture of two ionomers.• Commercially available PEDOT:PSS products are produced by Heraeus with the trade name Clevios and by AGFA with the trade nameOrgacon.• Heraeus Clevios™ P VP AI 4083 - one of the most commonly used PEDOT:PSS formulations for spin coated OPVs and OLEDs. Spins to ~40 nm at 5000 rpm. SAMI UR REHMAN 12 (sami-rehman.blogspot.com)
  • 13. PEDOT:PSSResistivity: 500-5000 ohm cmSolid content: 1.3 to 1.7%Na content: 400 ppm maximumSulfate content: 40 ppm maximumViscosity: 5-12 mPa sPEDOT:PSS ratio: 1:6Usage: <100 μl per standard (20 mm x 15mm) substrate.Price: £149 per 100ml SAMI UR REHMAN 13 (sami-rehman.blogspot.com)
  • 14. Encapsulation Epoxy• Encapsulation epoxy can be used as an adhesive for organic light-emitting diodes and organic photovoltaics without damaging the polymer or cathode.• In conjunction with a glass coverslip it can provide a robust barrier against ingress of oxygen and water to provide extended lifetimes for measurement and storage.• Cost: £69 per 10 ml SAMI UR REHMAN 14 (sami-rehman.blogspot.com)
  • 15. Glass substrate(Silicon TFT)• Glass substrates can be used to prepare organic photovoltaic cells and organic light emitting diodes. SAMI UR REHMAN 15 (sami-rehman.blogspot.com)
  • 16. Plastic Substrate• Glass substrates (silicon TFT). are difficult to bend.• However, a display with organic transistors on a plastic substrate would be completely flexible. Such a display could also be dropped without breaking, rolled up, or folded.• PET, PEN or Kapton are the examples of flexible substrates SAMI UR REHMAN 16 (sami-rehman.blogspot.com)
  • 17. Dimatix materials printer dmp-2800• The DMP-3000 has a printable area of 300 x 300 mm with a positional accuracy and repeatability of ± 5 µm and ± 1 μm, respectively.• The DMP-3000 uses a temperature controlled vacuum platen to accurately register, maintain and thermally manage substrates during printing.• These substrates include plastic, glass, ceramics, and silicon, as well as flexible substrates from membranes, gels, and thin films to paper products.• Cost: US 49,000$ (including shipping cost) SAMI UR REHMAN 17 (sami-rehman.blogspot.com)