Modifications in Organic Electronic Devices
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Home > Mathematics and Science books > Chemistry > Modifications in Organic Electronic Devices: Uncovering the Mechanisms of Performance Enhancement Using Interfacial Self Assembled Monolayers.
Modifications in Organic Electronic Devices: Uncovering the Mechanisms of Performance Enhancement Using Interfacial Self Assembled Monolayers.

Modifications in Organic Electronic Devices: Uncovering the Mechanisms of Performance Enhancement Using Interfacial Self Assembled Monolayers.


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About the Book

Organic light emitting diodes (OLEDs) are fabricated and characterized on anodes modified by a variety of surface treatments. OLED performance response is correlated to the treatment conditions with current-voltage (I-V) measurements and impedance spectroscopy. Small-scale OLED arrays are fabricated using a novel shadow mask approach and are characterized with electrical measurements, and the observation and sources of device-to-device variations are probed. An additional fabrication procedure for small-scale OLEDs via soft lithography is attempted, and a new approach to patterning soft lithographic stamps is developed. Finally, the electrical properties of self-assembled monolayers (SAMs) are studied in response to changes in the substrate surface and electrode composition. This study begins with an examination of the macro-scale OLED performance response to a variety of anode surface treatments. The inclusion of a SAM at the anode/organic interface dramatically influences the transient behavior of the diode, as observed via impedance spectroscopy and subsequent equivalent circuit analysis. A thorough investigation of OLED response to changes in device geometry has allowed the creation of a detailed OLED equivalent circuit model. Variations in the OLED anode cleaning procedures, interpreted with the aid of an equivalent circuit model, have afforded additional insight into the mechanism of performance enhancement upon the inclusion of a SAM. The presence of charge traps at the anode/organic interface hinders the establishment of a uniform electrode field across the diode, and passivation of charge traps through the inclusion of SAMs or through proper surface treatment improves OLED performance and efficiency. After elucidation of the detailed OLED equivalent circuit model, the size of the OLEDs was reduced to sub-micron dimensions through the use of a novel shadow mask fabrication scheme. Patterned suspended-membrane silicon nitride shadow masks with sub-micron dimensions have been fabricated by combing electron beam lithography (EBL) and traditional semiconductor processing. In addition, two new atomic force microscopy (AFM) techniques have been developed to characterize sub-micron diodes, atomic force electroluminescence microscopy (AFEM) and bridge-enhanced nano-scale impedance microscopy (BE-NIM). AFEM allows the traditional OLED performance metrics (I-V plots) to be gathered for devices


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Product Details
  • ISBN-13: 9781243500120
  • Publisher: Proquest, Umi Dissertation Publishing
  • Publisher Imprint: Proquest, Umi Dissertation Publishing
  • Height: 254 mm
  • Sub Title: Uncovering the Mechanisms of Performance Enhancement Using Interfacial Self Assembled Monolayers.
  • Width: 203 mm
  • ISBN-10: 1243500123
  • Publisher Date: 02 Sep 2011
  • Binding: Paperback
  • Spine Width: 14 mm
  • Weight: 445 gr


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Modifications in Organic Electronic Devices: Uncovering the Mechanisms of Performance Enhancement Using Interfacial Self Assembled Monolayers.
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Modifications in Organic Electronic Devices: Uncovering the Mechanisms of Performance Enhancement Using Interfacial Self Assembled Monolayers.
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