Printed OTFTs with excellent DC and AC characteristics and record transition frequencies of >300 kHz using high speed Micro Gravure Printing at UC Berkeley.
"Here, we demonstrate high-performance printed TFTs [thin-film transistors], scaling to unprecedented levels via advanced femtoliter-scale micro-gravure printing (µGravure), to realize devices with excellent DC and AC characteristics. This is achieved through a combination of novel and dramatically improved gravure printing processes, properly optimized and characterized materials, and proper electrostatic scaling. By proper scaling, we achieve record transition frequencies of > 300 kHz, and> 1000 × improvement over other work. We are able to print sheets of devices at printing speeds of almost 1 m s-1, an important step in the development of truly low-cost fabrication
Report: "High-Performance Printed Transistors Realized Using
Femtoliter Gravure-Printed Sub-10 μm Metallic
Nanoparticle Patterns and Highly Uniform Polymer
Dielectric and Semiconductor Layers" from Hongki Kang, Rungrot Kitsomboonloha, Jaewon Jang, and Vivek Subramanian
Read the whole report here:
Ohio Gravure Technologies (www.OhioGT.com) offers their engraving expertise with the next generation engraver, the Gravostar Spectrum, and the most advanced engrave head, the multi-tune Vision IV 12 KHz. The company also offers unique products for the Printed Electronics market with the MicroStar system and the AccuPress system. The MicroStar system, which unlike laser engraving and etching, provides low roughness inside the cell, variable cell shapes and depths, screenless cell placement, all with a single cut. The award-winning AccuPress system, with layer to layer registration accuracy below 5 micron, will soon be available with a light curing and Roll to Roll addition.
For more information about our services and unique machines for gravure engraving, printed electronics and other high precision applications, please contact us.