Huai-Yuan (Michael) Tseng EE C235

 Organic / flexible electronics ◦ Low cost solution process  Spin / drop cast  Printing ◦ Large area  Plastic substrate  Difficult to scale down to sub-micron feature sizes

 Top-down technique – Self align printing Noh, Y. Y.; Zhao, N.; Caironi, M.; Sirringhaus, H. Nat. Nanotechnol. 2007, 2 (12), 784–789. Sele, C. W.; Von Werne, T.; Friend, R. H.; Sirringhaus, H. AdV. Mater. 2005, 17 (8), 997–1001  However, low device densities, limited by printing feature size

 Large area organics/flexible nanoelectronics ◦ High density of nanodevices ◦ Addressing  Nanoarrays and crossbars Beckman, R.; Johnston-Halperin, E.; Luo, Y.; Green, J. E.; Heath, J. R. Science 2005 (310 )p465 Only a single wire conduct

PEDOT:PSS =Poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) PDMS Molding

On/off is controlled by switching the conductivity of a transistor channel consisting of PEDOT/PSS in contact with a common electrolyte. Doping and de-doping of PEDOT can result in conductivity changes of up to five orders of magnitude

 This work has successfully demonstrate ◦ Large area patterning of connected micro/nanolines from the conducting polymer PEDOT, assembled from fluids ◦ Nanotransistors  Large area nanoregistration