“Printing Methods, Stability and Efficiency Improvements
in Organic Electronic Devices”
Dr. Amare Benor, Bowling Green State University
Flexible and lightweight organic electronics realized on large areas have gained considerable attention in recent years. The interest is particularly generated by the increasing demand in low-cost large area displays, smart cards and radio frequency identification tags and the like. We studied alternative printing approaches, including methods to improve the stability and efficiency of organic electronic devices. The combination of microcontact printing and selective wetting/dewetting provides a universal route to pattern a variety of different materials, including polymers and metal films. The methods can be applied in both organic and inorganic electronic device fabrications. The influence of the printing methods on organic thin-film transistor (TFT) performance will be presented. Furthermore, the electrical stability of the transistors in relation to the creation of electronic defects by oxygen exposure was studied. The study indicates fabrication strategies for improved stability of the device during operation. Finally, a method that tremendously improved efficiency of organic light-emitting diodes (OLEDs), derived by the TFTs, will be introduced. The method is based on treatment of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate), PEDOT:PSS, films by ultraviolet light-ozone exposure. Detailed device physics of the charge balance and the related efficiency improvement will be discussed.
Amare Benor is a postdoc at Bowling Green State University.