Material- und Technologieentwicklung zur Erzeugung von Multilayer-Funktionspolymer-Devices fuer die Polymerphotovoltaik Abschlussbericht

In the scope of this research project, flexible solar cells are constructed using semiconductor polymers and a combination of materials from which an improvement of efficiency and long-term stability can be expected. Solar cells of donator/acceptor type are prefered. Both components are procured as photoactive composite on the substrate by spincoating. Regioregular poly(3-alkylthiophene) (P3DDT, P3OT), poly[2,2'-bipyridin-5,5'-diylethynylen-(2,5-octadecyloxy-1,4-phenylene)]ethynyle ne and the new poly[1,4-phenyleneethynylene-1,4-(2,5-didodecyloxyphenylene)-1,4-phenylenethene- 1,2-diyl-1,4-(2,5-didodecyloxyphenylene)-ethene-1,2-diyl] are used as p-conducting semiconductor polymers (donators). Polymers which contain carbon-carbon triple bonds have a distinct higher oxidation potential in comparison to the homopolymer phenylenevinylene. The higher oxidation potential increases the stability of the materials. C60 fullerene, its derivatives and N,N'-bisalkylperylenediimides are used as n-conducting semiconductor polymers (acceptors). The authors synthesized and characterized C_60-dimethylpyrrolidiniumiodide. With the aid of photoluminescence extinction and light induced electron spin resonance spectroscopy, the donator acceptor charge transfer is measured beside the investigation of absorption coefficients. The solar cells consist of polyester foils coated with indium tin oxide. The surface area of these solar cells amount 0.25 to 4 cm"2. The author describes three types of polymeric solar cells by means of efficiency, surface area and illumination intensity. The new polymers with carbon-carbon triple bond have an improved no-load voltage in comparison to P3DDT and P30T. Furthermore, these new polymers have an improved stability with respect to solar cells using PPV homopolymers.SIGLEAvailable from TIB Hannover: F04B56 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman