Novel small molecule hole transporting materials for perovskite hybrid solar cells, replacing spiro-MeOTAD with something less fancy

Vytautas Getautis^a, Maryte Daskeviciene^a, Artiom Magomedov^a, Tadas Malinauskas^a, Paul Gratia^b, Mohammad K. Nazeeruddin^b, Michael Grätzel^b

^aDepartment of Organic Chemistry, Kaunas University of Technology, Radvilenu 19, 50254, Kaunas, Lithuania

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Tadas Malinauskas, 092
Publication date: 5th February 2015

Today organic electronics require ability to create devices by solution deposition methods, preferably using simple, inexpensive and easily purified compounds. Therefore, synthesis of efficient charge transporting materials meeting all these requirements is an important task. During last few years, a number of various charge transporting materials was synthesized and investigated for application in perovskite photovoltaic devices. A lot of these molecules are prepared using relatively complicated and expensive synthesis procedures involving organotin, organolithium, or organomagnesium reagents and often more than five synthesis steps. From the technological and commercial point of view simplification of the synthesis procedures, reduction of the materials costs and time needed to produce charge transporting materials are very welcome indeed. Star-shaped charge transporting materials with aromatic or arylamine core and varying number of different arylamine, phenylethenyl or heterocycle side-arms could be a promising alternative to spiro-OMeTAD. These hole transporting organic semiconductors are obtained in one or two step synthesis procedures from commercially available or relatively inexpensive starting materials. By varying structure and amount of the attached fragments crystallinity, glass transition temperature, size of the π-conjugated system, energy levels, and the way molecules pack in the solid state can be significantly influenced. The research leading to these results has received funding from the European Union Seventh Framework Programme [FP7/2007-2013] under grant agreement n° 604032 of the MESO project.

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