|About this Abstract
||2013 TMS Annual Meeting & Exhibition
||2013 and Beyond: Flexible Electronics
||Flexible, Large-Area Sensor Circuits Fabricated by Additive Printing
||Tse Nga Ng, David Schwartz, Gregory Whiting, Robert Street, Janos Veres
|On-Site Speaker (Planned)
||Tse Nga Ng
Organic materials have been demonstrated as good candidates for large-area flexible sensors, because they allow wide tolerance of sensor geometry and thickness, which would ease fabrication problems such as strain induced cracking on deformable platforms. Here we present organic photodiodes and control circuits that were fabricated by inkjet printing. The photodiode was made from a polymer blend, and an optimized photodiode film was integrated with an active-matrix transistor array. The flexible image sensor array showed sensitivity of 30 pW/cm^2 and was suitable for large-area x-ray imaging. In addition to active-matrix arrays, the printed transistors were developed into logic circuits for processing the sensor signals. For example, a shift register and a threshold detector were demonstrated to control sensor arrays. Device characterization and circuit simulations were carried out to achieve designs that tolerate the variations in printed devices, as well as to determine design rules for reliable printed electronic systems.