Interfacial Widths of Conjugated Polymer Bilayers
The interfaces of conjugated polyelectrolyte (CPE)/poly[2-methoxy-5-(2{prime}-ethylhexyloxy)-p-phenylene vinylene] (MEH-PPV) bilayers cast from differential solvents are shown by resonant soft X-ray reflectivity (RSoXR) to be very smooth and sharp. The chemical interdiffusion due to casting is limited to less than 0.6 nm, and the interface created is thus nearly 'molecularly' sharp. These results demonstrate for the first time and with high precision that the nonpolar MEH-PPV layer is not much disturbed by casting the CPE layer from a polar solvent. A baseline is established for understanding the role of interfacial structure in determining the performance of CPE-based polymer light-emitting diodes. More broadly, we anticipate further applications of RSoXR as an important tool in achieving a deeper understanding of other multilayer organic optoelectronic devices, including multilayer photovoltaic devices.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- Advanced Light Source Division
- DOE Contract Number:
- DE-AC02-05CH11231
- OSTI ID:
- 1023375
- Report Number(s):
- LBNL-4689E; JACSAT; TRN: US201118%%973
- Journal Information:
- JACS, Vol. 131, Issue 35; ISSN 0002-7863
- Country of Publication:
- United States
- Language:
- English
Similar Records
Enhanced photooxidative stability of conjugated polymers via C{sub 60} doping
Investigation of electrical and optical properties of MEH-PPV: ZnO nanocomposite films for OLED applications