Seminar 2/22/2012 - Qibing Pei, University of California-Los Angeles: Transparent Composite Electrodes for Stretchable Polymer Thin Film Devices
Abstract: Both single wall carbon nanotubes and silver nanowires have been employed to fabricate transparent electrodes by an in-situ composite synthesis and transfer technique. The composite electrodes retain the high conductivity of the conductive network and the mechanical flexibility of the polymer matrix. Surface roughness of the composites is less than 10 nm, suitable for the fabrication of thin film electronic devices. The electrodes can be stretched by up to large strains without significant loss of sheet resistance. The composites are used to fabricate three flexible devices: (1) polymer LEDs, (2) polymer solar cells, and (3) bistable electroactive polymer actuators. The LEDs show 15-50% higher efficiency than control devices fabricated on ITO/glass substrate. The solar cells exhibit lower efficiency than controls due to insufficient surface coverage. When a stack of short and long silver nanowires are employed in the composite, the photovoltaic performance is increased to being comparable to the controls. The composite electrodes have also been used for Joule heating and the actuation of polymer actuators to large strains. I will additionally describe the fabrication of intrinsically stretchable polymer LEDs and refreshable Braille readers.
All seminars are held on Wednesdays from 12:00 noon-1:00 p.m. in the Bowen Hall Auditorium Room 222. A light lunch is provided at 11:30 a.m. in the Bowen Hall Atrium immediately prior to the seminar.
Location: Bowen Hall Auditorium
Date/Time: 02/22/12 at 12:00 pm - 02/22/12 at 1:00 pm
Category: PRISM/PCCM Seminar Series