By Oana D. Jurchescu
Denton Fellow and Physics Professor, Department of Physics and Center for Functional Materials, Wake Forest University, Winston-Salem, NC
Plastic is ubiquitous in many sectors of our lives, from large industries to personal use. This is due to its low cost, lightweight, and ease of molding into any shape. In the electronics industry, for many years the use of plastic was restricted to that of an encapsulant. The birth of plastic electronics has changed that and an increasing number of products are approaching the marketplace, including rollable displays, tattoo-like smart bandages that inform medical professionals in real time, conformable electronics inserted into clothes and even human body. In this presentation I will focus on several opportunities and challenges faces by organic materials and devices. Organic semiconductors are highly susceptible to defect formation, owing to their weak intermolecular interactions, and the electronic states formed in the gap typically reduce device performance. I will discuss the origin and energetic distribution of several different types of traps in organic semiconductors and their impact on device performance. I will first focus on isomer coexistence and its impact on device performance. Next, the influence of the polaronic effects and thermally generated microstrain at device interfaces will be described. The consecutive layers often have very different mechanical and thermal properties, therefore exhibiting different responses to external stimuli. These effects are widely overlooked despite their ubiquitous presence in layered devices. Since the uncontrollable nature of the film formation overwhelms the fabrication benefits of solution deposition, in the last part of the talk I will introduce laser-printing, a solvent-free additive manufacturing method that allowed for simultaneous deposition and patterning of organic transistors on flexible substrates.
Oana Jurchescu is a Professor and the Associate Chair of The Physics Department at Wake Forest University (WFU). She received her PhD in 2006 from University of Groningen, the Netherlands, and was a postdoctoral researcher at the National Institute of Standards and Technology in Gaithersburg, MD, until 2009, when she joined WFU. Her expertise is in charge transport in organic and organic/inorganic hybrid semiconductors, device physics and semiconductor processing. She published 90 peer-reviewed articles, 4 invited book chapters, 3 patents and gave over 50 invited or plenary talks at conferences. She won the National Science Foundation CAREER award, the ORAU Ralph E. Powe Junior Faculty Enhancement award, the WFU award for excellence in research, the WFU innovation award, the WFU prize for excellence in teaching and the WFU award for excellence in mentoring. She is associate editor for Journal of Materials Chemistry C (Royal Chemical Society), and a member of the editorial boards of Organic Electronics (Elsevier), JPhys Materials (IOP Publishing), and Scientific Reports (Nature publishing group). She served in a variety of capacities, including program chair and co-chair, for over 30 international conferences and workshops such as MRS, APS, SPIE, etc.
Zoom Webinar: https://stevens.zoom.us/j/96875673368
For more information, please contact Vanessa Irizarry at [email protected]