Micro- and Nanopatterning Techniques for Organic Electronic and Optoelectronic Systems

Abstract

Daniel Shir graduated with distinction and obtained a B.S. degree in materials science and engineering from the Pennsylvania State University in 2005. He is currently pursuing a Ph.D. degree in materials science and engineering at the University of Illinois at Urbana−Champaign under Professor John A. Rogers's guidance. Yun-Suk Nam obtained a Ph.D. degree in chemical engineering from Sogang University, Seoul, South Korea, in 2004. He is currently a postdoctoral researcher in the Department of Materials Science and Engineering at the University of Illinois at Urbana−Champaign. Seokwoo Jeon was born in Seoul, Korea, in 1975. He received his B.S. degree in 2000 and his master's degree with Professor Shinhoo Kang from Seoul National University in 2003 after one year as an exchange graduate student with Professor Paul V. Braun at the University of Illinois at Urbana−Champaign (UIUC). He is currently pursuing his Ph.D. degree in materials science and engineering at UIUC under the direction of Professor John A. Rogers. His research interests include soft lithography, 3D nanopatterning, microfluidic systems, and optically functional materials and devices. John A. Rogers obtained B.A. and B.S. degrees in chemistry and in physics from the University of Texas, Austin, in 1989. From MIT, he received S.M. degrees in physics and in chemistry in 1992 and the Ph.D. degree in physical chemistry in 1995.

Transparent Triboelectric Nanogenerators and Self-Powered Pressure Sensors Based on Micropatterned Plastic Films

“…Hence, through rational design we have significantly improved its ability in the power generation utilizing polymer patterned arrays to increase the triboelectric effect and the capacitance change. Here, PDMS film plays an important role and benefits the performance in two aspects: (1) it is a soft, transparent material and could easily be fabricated into a patterned array with various features, (2) the location of PDMS in the triboelectric series is far away from that of PET, which is critical for achieving a higher performance (Supporting Information Figures S5 and S6). Furthermore, since the entire structure is based on polymer materials, the FTNG exhibits excellent mechanical robustness and stability, and it can still work properly after being tested for ∼10 5 cycles ( Figure 3D).…”

Reversible Optical Control of Conjugated Polymer Solubility with Sub-micrometer Resolution

“…Proposed solutions to these deposition issues include cross-linking reactions, 16À19 tailored synthesis, 14,20 self-assembly, 21 orthogonal solvents, 12,13 evaporated protecting layers, 8 improved photoresists, 13,22À26 soft lithography, 21,27À29 and surfacedirected pattering. 2,3,11,14,28 Unfortunately, none of these methods are universally effective and many require numerous processing steps, reducing the cost advantage of solution-processing.…”

“…Other techniques such as soft lithography are not easily applied to devices requiring pattering over disparate length scales 5,21,27,29,30 or requiring precise alignment. In short, despite the promise of cheap, solution-processed large-area electronics, the lack of a disruptive patterning methodology, like photolithography was for inorganic semiconductors, is holding back commercial adoption of polymeric electronics.…”

Ambient Electronics

“…Various prototype integrated circuits with organic transistors have been fabricated by printing technologies such as inkjet printing, 27,[46][47][48] microcontact printing, [49][50][51] nanoimprinting, 52,53) offset printing, 54) and screen printing. 48) In 2004, Ana Arias of Palo Alto Research Center, Xerox, and colleagues fabricated 128 Â 128 cell organic transistor matrix arrays with a resolution of 75 dpi (340 m pixel size) by inkjet printing.…”