Solution-Processed Flexible Memory Devices Dr. Nadine Gergel-Hackett Dr. Behrang Hamadani Dr. Curt Richter Dr. David Gundlach

Technology Motivation Flexible electronics is an emerging industry that sprays electronic devices onto inexpensive plastic sheets (like inkjet printer on an overhead transparency) Problem: Currently no method exists in flexible electronics for fabricating non-volatile low operation voltage memory devices ie devices that hold written state without an applied voltage Completed design and fabrication of electronic memory devices on inexpensive plastic substrates actual devices

Commercial Applications Integrated Sensor is Structure – T. Clark/DARPA sensor pack power supply processor & RFID communication Memory in display Sensor Tape – J. Ricklin/DARPA Flexible memory devices would have applications in almost all flexible electronics circuits, some possible uses of flexible electronics include:

Advantages of Method of Device Fabrication: Can be performed at room temperature and pressure Simplified design Inexpensive fabrication procedures Technology - Combining separate existing technologies (a) Contact Flexible Substrate Sol gel TiO 2 actual devices

Technology Devices showed an electrical switching with memory behavior Electrical characteristics of device

Technology Applications Areas for Improvement: write and erase voltage values, and on/off ratios vary between devices, and increase with operation Devices switched maximum of <10 times before permanently remaining in high state Source of electrical switching behavior not yet well studied

Technology Applications

Potential Applications : The Missing Piece for the Realization of Flexible Electronics Display Sensors Logic (computing) Memory (Low Power, Re-Writeable)

Solution-Processed Flexible Titanium Dioxide Memory Devices Provisional patent application filed 1/22/08 serial # 51/022,534 Licensing & Collaboration Opportunity

Contact Information Nadine Gergel-Hackett, Ph.D David Gundlach, Ph.D Curt Richter, Ph.D