[seminar] Seminar na IF-u, 8. srpnja 2013. u 15:00h

[Osor Barisic]

Institut za fiziku, Bijenička cesta 46, 

predavaonica u zgradi Mladen Paić 

ponedjeljak, 8. srpnja 2013., u 15:00 sati 


The use of cyanine dyes in solid state organic heterojunction solar cells 


Prof. F. A. Nüesch 


Laboratory for Functional Polymers, Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland 


Today a plethora of soluble cyanine dyes absorbing from the ultra-violet to the near-infrared domain are available owing to more than a century of research and development, mostly in photographic industry. Numerous properties of cyanine dyes suggest that this material class would be most interesting for organic solar cell applications, but only few works have employed these dyes as organic semiconductor. Most importantly the unparalleled absorption coefficients allow using very thin films for harvesting the solar photons. Cyanines also present favourable redox potentials making it possible to use them as electron donors and acceptors in organic heterojunction solar cells. With respect to crystallinity, these polymethine dyes tend to form aggregates where charge and excited states are delocalized over hundreds of molecules. Furthermore, cyanines are cationic polymethine dyes, offering the possibility to tune the materials by defining the counter-anion. Under applied bias, counter ions can be moved across the organic heterointerface and induce substantial photocurrent increase. So far charge carrier transport in thin cyanine films has been rather deceiving and inhibited exploitation of high performance in solid state organic heterojunction devices. Recently it became possible to go around this bottleneck. 




Voditelji seminara IF-a: Nikša Krstulović i Osor Bari šić 







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