Bulletin of the American Physical Society
APS March Meeting 2017
Volume 62, Number 4
Monday–Friday, March 13–17, 2017; New Orleans, Louisiana
Session C21: Flexible and Stretchable Organic ElectronicsInvited
|
Hide Abstracts |
Sponsoring Units: DPOLY Chair: Bryan Boudouris Brian Collins, Purdue University, Washington State University Room: 281-282 |
Monday, March 13, 2017 2:30PM - 3:06PM |
C21.00001: Small Molecules for Large-Area Applications Invited Speaker: Yueh-Lin Loo Because of their inherent narrow and tunable absorption properties, organic semiconductors are particularly suited for use in unconventional solar cells, such as visibly transparent devices that can be deployed in buildings-integrated applications. We report solar cells with record single-junction photovoltages that use organic active layers designed to selectively harvest near-ultraviolet (near-UV) light while transmitting visible and near-infrared light. Cells comprising contorted hexabenzocoronene (cHBC) derivatives as electron donor and acceptor produce up to 100{\%} more power per harvested UV photon than conventional crystalline silicon cells. Power generation in these solar cells is scalable with area while architectural simplicity, fabrication and integration ease for large-area applications is retained through their single-junction structure. Integration with electrochromic windows thus enables intelligent management of the solar spectrum, with the solar cells harvesting near-UV photons to power the regulation of visible and near-infrared photons for natural lighting and heating purposes. [Preview Abstract] |
Monday, March 13, 2017 3:06PM - 3:42PM |
C21.00002: Plastic Deformation as a Means to Achieve Stretchable Polymer Semiconductors Invited Speaker: Brendan O'Connor Developing intrinsically stretchable semiconductors will seamlessly transition traditional devices into a stretchable platform. Polymer semiconductors are inherently soft materials due to the weak van der Waal intermolecular bonding allowing for flexible devices. However, these materials are not typically stretchable and when large strains are applied they either crack or plastically deform. Here, we study the use of repeated plastic deformation as a means of achieving stretchable films. In this talk, critical aspects of polymer semiconductor material selection, morphology and interface properties will be discussed that enable this approach of achieving stretchable films. We show that one can employ high performance donor-acceptor polymer semiconductors that are typically brittle through proper polymer blending to significantly increase ductility to achieve stretchable films. We demonstrate a polymer blend film that can be repeatedly deformed over 65{\%}, while maintaining charge mobility consistently above 0.15 cm2/Vs. During the stretching process we show that the films follow a well-controlled repeated deformation pattern for over 100 stretching cycles. [Preview Abstract] |
Monday, March 13, 2017 3:42PM - 4:18PM |
C21.00003: Interfacing with the Brain using Organic Electronics. Invited Speaker: George Malliaras One of the most important scientific and technological frontiers of our time lies in the interface between electronics and the human brain. Interfacing the most advanced human engineering endeavor with nature's most refined creation promises to help elucidate aspects of the brain's working mechanism and deliver new tools for diagnosis and treatment of a host of pathologies including epilepsy and Parkinson's disease. Current solutions, however, are limited by the materials that are brought in contact with the tissue and transduce signals across the biotic/abiotic interface. The field of organic electronics has made available materials with a unique combination of attractive properties, including mechanical flexibility, mixed ionic/electronic conduction, enhanced biocompatibility, and capability for drug delivery. I will present examples of organic-based devices for recording and stimulation of brain activity, highlighting the connection between materials properties and device performance. I will show that organic electronic materials provide unparalleled opportunities to design devices that improve our understanding of brain physiology and pathology, and can be used to deliver new therapies. [Preview Abstract] |
Monday, March 13, 2017 4:18PM - 4:54PM |
C21.00004: Molecularly Stretchable Electronics for Energy and Healthcare. Invited Speaker: Darren Lipomi The term ``plastic electronics'' masks the wide range of mechanical behavior possessed by films of $\pi $-conjugated (semiconducting) small molecules and polymers. Such materials are promising for biosensors, large-area displays, low-energy lighting, and low-cost photovoltaic modules. There is also an apparent trade-off between electronic performance and mechanical compliance in films of some of the best-performing semiconducting polymers, which fracture at tensile strains not significantly greater than those at which conventional inorganic semiconductors fail. The design of intrinsically deformable electronic materials---i.e., imagine a semiconducting rubber band---would facilitate roll-to-roll production, mechanical robustness for potable applications, and conformal bonding to curved surfaces. This seminar describes my group's efforts to understand and control the structural parameters that influence the mechanical properties of $\pi $-conjugated polymers. The techniques we employ include synthetic chemistry, spectroscopy and microstructural characterization, computation from the molecular to continuum level, and electrical measurements of devices. A complex picture emerges for the interplay between molecular structure, the way the process of solidification influences the morphology, and how molecular structure and morphology combine to produce a film with a given modulus, elastic range, ductility, and toughness. We are also exploring ways to introduce other properties into organic semiconductors that are inspired by biological tissue. That is, not just elasticity and toughness, but also biodegradability and the capacity for self-repair. The seminar will also touch on our use of self-assembled metallic nanoislands on graphene for ultra-sensitive mechanical sensing using piezoresistive and ``piezoplasmonic'' mechanisms. The applications for these materials are in detecting human motion and measuring the mechanics of cardiac and musculoskeletal cells. My group is broadly interested in the intersection of soft materials and human touch for virtual and augmented reality, and I will briefly mention our work in these areas. [Preview Abstract] |
Monday, March 13, 2017 4:54PM - 5:30PM |
C21.00005: High-Throughput Printing Process for Flexible Electronics Invited Speaker: Woo Jin Hyun Printed electronics is an emerging field for manufacturing electronic devices with low cost and minimal material waste for a variety of applications including displays, distributed sensing, smart packaging, and energy management. Moreover, its compatibility with roll-to-roll production formats and flexible substrates is desirable for continuous, high-throughput production of flexible electronics. Despite the promise, however, the roll-to-roll production of printed electronics is quite challenging due to web movement hindering accurate ink registration and high-fidelity printing. In this talk, I will present a promising strategy for roll-to-roll production using a novel printing process that we term SCALE (Self-aligned Capillarity-Assisted Lithography for Electronics). By utilizing capillarity of liquid inks on nano/micro-structured substrates, the SCALE process facilitates high-resolution and self-aligned patterning of electrically functional inks with greatly improved printing tolerance. I will show the fabrication of key building blocks (e.g. transistor, resistor, capacitor) for electronic circuits using the SCALE process on plastics. [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700