Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Today organic electronics require ability to create devices by solution deposition methods, preferably using simple, inexpensive and easily purified materials. Organic photovoltaic devices are made of multiple layers and high performance is only possible using materials which have good compatibility with each-other. Therefore, synthesis of durable charge transporting materials that have appropriate energy levels and high charge drift mobility for organic photovoltaic devices is a significant task.
Nitrogen containing organic derivatives of triphenylamine and carbazole are well known HTM materials for organic photovoltaic devices. Unfortunatelly, majority of these materials have rather average charge mobilities. Introduction of the phenylethenyl moieties into a triphenylamine core proved to be highly effective [1] method to increase hole drift mobility. Due to the positive influence of these sidearms on the triphenylamine molecule’s conjugated π-electron system and charge mobility, the same fragments have been added to various N-alkyl subsituted carbazoles, as well. Carbazoles with phenylethenyl moieties were synthesized in a one-step synthesis procedure using commercially available materials. Glass transition temperature, energy levels and packing of the molecules in the solid state can be influenced by changing size of the alkyl chain.
Malinauskas, T.; Tomkute-Luksiene, D.; Daskeviciene, M.; Jankauskas, V.; Juska, G.; Gaidelis, V.; Arlauskas, K.; Getautis, V. One small step in synthesis, a big leap in charge mobility: diphenylethenyl substituted triphenylamines. Chemical Communications 2011,47, 7770-7772.
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