17 May 2000 Combinatorial synthesis of π-conjugated polymer thin films for functional material research
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Combinatorial approach was employed to fabricate single and bi- layer films of (pi) -conjugated polymers for exploring their new electrical and/or photofunctional properties. (pi) -conjugated polymer sources were synthesized from organo-nickel or -palladium complexes, and evaporated by vacuum evaporation. A variety of films with different thickness, those with a bi-layer structure, and so on were integrated on substrates such as ITO coated glass, quartz glass, and silicon wafer by defining the area of the film deposition using physical masks. IR measurements revealed that the evaporated single layer polymer film retained the bulk structure and that of the double layered films gave absorption as the sum of single layered films. As the first step for exploration of electroluminescent device, various bilayer films composed of p-type and n-type (pi) -conjugated polymer layers were fabricated combinatorially on ITO coated glass substrate and their electrical properties were investigated. Diode property was observed in the (ITO/PPP(poly(p-phenylene)/PPy (poly(pyridine- 2,5-diyl)/Ag) heterostructures and their current density was mainly dependent on the thickness of PPy. Optimization of metal employed for electron injection was carried out by combinatorial technique. Smaller turn-on voltage was observed for Mg than for Ag and In. This result can be explained on the basis of work function of metals and LUMO energy of PPy. Insertion of thin LiF layer between the PPy and metal electrode resulted in more smooth electron injection.
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Takuya Hashimoto, Yukiko Muramatsu, Tomohiro Hayakawa, Hiroki Fukumoto, Takakazu Yamamoto, Hideomi Koinuma, "Combinatorial synthesis of π-conjugated polymer thin films for functional material research", Proc. SPIE 3941, Combinatorial and Composition Spread Techniques in Materials and Device Development, (17 May 2000); doi: 10.1117/12.385417; https://doi.org/10.1117/12.385417

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