Buried interfaces: interfacial interactions in materials for polymer-LED applications
✍ Scribed by Andersson, A.; Kugler, Th.; Lögdlund, M.; Holmes, A. B.; Li, X.; Salaneck, W. R.
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 169 KB
- Volume
- 28
- Category
- Article
- ISSN
- 0142-2421
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✦ Synopsis
Chemical interactions at the interface between a precursor polymer for poly(p-phenylenevinylene), namely poly(p-xylylene-a-tetrahydrothiophene chloride), and an indium-tin-oxide (ITO) transparent electrode, have been studied through polymer films of >10 nm thick using x-ray photoelectron spectroscopy. The HCl released in the conversion process interacts with the surface of the ITO substrate at the polymer/substrate interface, leading to the formation of indium chloride, which then diffuses into the polymer. It appears that ITO, or possibly the indium chloride generated at the interface, acts as a catalyst for the thermal elimination reaction. The results show unequivocally that interfacial interactions are of major importance in understanding, and ultimately improving, the performance of polymer-based electroluminescent devices, and that interfaces buried under >10 nm of polymer may be studied.