Title page for ETD etd-12212005-001600


Type of Document Dissertation
Author Sankir, Nurdan Demirci
Author's Email Address
URN etd-12212005-001600
Title FLEXIBLE ELECTRONICS: MATERIALS and DEVICE FABRICATION
Degree PhD
Department Materials Science and Engineering
Advisory Committee
Advisor Name Title
Claus, Richard O. Committee Chair
Corcoran, Sean Gerald Committee Member
Lu, Guo-Quan Committee Member
Stilwell, Daniel J. Committee Member
Viehland, Dwight D. Committee Member
Keywords
  • field effect transistor.
  • flexible electronics
  • inkjet printing
  • organic semiconductors
  • organic electronics
  • line patterning
  • electrical conductivity
Date of Defense 2005-12-07
Availability unrestricted
Abstract
This dissertation will outline solution processable materials and fabrication techniques to manufacture flexible electronic devices from them. Conductive ink formulations and inkjet printing of gold and silver on plastic substrates were examined. Line patterning and mask printing methods were also investigated as a means of selective metal deposition on various flexible substrate materials. These solution-based manufacturing methods provided deposition of silver, gold and copper with a controlled spatial resolution and a very high electrical conductivity. All of these procedures not only reduce fabrication cost but also eliminate the time-consuming production steps to make basic electronic circuit components. Solution processable semiconductor materials and their composite films were also studied in this research. Electrically conductive, ductile, thermally and mechanically stable composite films of polyaniline and sulfonated poly (arylene ether sulfone) were introduced. A simple chemical route was followed to prepare composite films. The electrical conductivity of the films was controlled by changing the weight percent of conductive filler. Temperature dependent DC conductivity studies showed that the Mott three dimensional hopping mechanism can be used to explain the conduction mechanism in composite films. A molecular interaction between polyaniline and sulfonated poly (arylene ether sulfone) has been proven by Fourier Transform Infrared Spectroscopy and thermogravimetric analysis. Inkjet printing and line patterning methods also have been used to fabricate polymer resistors and field effect transistors on flexible substrates from poly-3-4-ethyleneoxythiophene/poly-4-sytrensulfonate. Ethylene glycol treatment enhanced the conductivity of line patterned and inkjet printed polymer thin films about 900 and 350 times, respectively. Polymer field effect transistors showed the characteristics of traditional p-type transistors. Inkjet printing technology provided the transfer of semiconductor polymer on to flexible substrates including paper, with high resolution in just seconds.

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