Influence of TiO_2 nanoparticles on the photovoltaic efficiency of the ITO/PEDOT:PSS/fluorine copolymers/polythiophene: TiO_2/Al architecture

摘要

Results of a study on the application of a copolymer of fluorine as acceptor and lΗ-pyrazolo[3,4-b]quinoxaline as a donor in bulk heterojunction solar cells are given. To the best of our knowledge, lΗ-pyrazolo[3,4-b]quinoxaline co-polymers were not applied in organic photovoltaic devices yet. Organic photovoltaic devices as well as devices of active layers with TiO_2 nanocrystals of different crystallite size were investigated. The methods of polymer and TiO_2 nanocrystllites synthesis are presented and their physical properties are given. The fabricated photovoltaic structures possess high values of U_(oc) voltage as as well as relatively high parameters of I_(sc) currents. The maximally achieved parameters corresponded to open circuit voltage U_(oc) - 1.13[V], and short current density I_(sc) = 33.49[μA] under illumination 1,3 [μW cm~(-2)], which correspond to energy conversion efficiency equal to about 0.80 %. The TiO_2 nanocrystallites play a crucial role in the photovoltaics parameters.