Calendar Details

For more information about item submission and attendance, see About the Technical Calendar.

Friday, November 20

Encapsulation Methods for Organic Electronic Devices

Samuel Graham, Georgia Institute of Technology, Atlanta
Energy Efficiency and Electric Technologies Program Seminar
11:00 AM, Weinberg Auditorium, Building 4500-N
Contact: Melissa Lapsa (lapsamv@ornl.gov), 865.576.8620

Abstract

We will report on a low-temperature thin-film encapsulation method for organic devices based on a thin layer of SiOx or SiNx, coated with a layer of Al2O3 and capped with parylene. Layers of SiOx and SiNx (100 nm) were deposited by plasma enhanced chemical vapor deposition (PECVD) to provide for a fast coverage of the devices forming the basis of the encapsulation. A thin layer (10 nm) of Al2O3 was deposited using atomic layer deposition (ALD), essentially sealing the defects in the PECVD layer and yielding effective water vapor transmission rates on the order of 10-5 g/m2/day at 20 °C and 50 % relative humidity. The barrier films were integrated with pencacene/C60 organic solar cells which showed no decrease in power conversion efficiency after 7,000 h of exposure to air, demonstrating the usefulness of this encapsulation technique. In addition, a new sealing technology which enables the "lamination" of flexible encapsulation layers over organic LEDs and photovoltaics with long term stability will be discussed.

Prof. Samuel Graham joined the Georgia Institute of Technology in 2003, where he is currently an Associate Professor and the Joseph H. Anderer Faculty Fellow in the Department of Mechanical Engineering. Prior to joining the Georgia Institute of Technology, Prof. Graham served as a Senior Member of the Technical Staff at Sandia National Laboratories in Livermore, CA (1999-2003). Currently he serves as an Associate Director of the NSF STC MDITR where he is the packaging team leader for organic electronics. He is also a member of the Center for Organic Photonics and Electronics based at Georgia Tech. His research currently expands the integration of new materials and understanding the reliability in organic electronic, photovoltaics, and GaN electronics for energy applications. As of October 1, 2009, Prof. Graham also holds a Joint Faculty Appointment with ORNL's Building Technology Research and Integration Center.

Host: Tom King, Director, Energy Efficiency and Electric Technologies Program