Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.155
Publication date: 22nd December 2022
Lately, non-fullerene acceptors (NFA’s) have received increasing attention for use in polymer-based bulk-heterojunction organic solar cells, as improved photovoltaic performance compared to classical polymer-fullerene blends could be demonstrated. In this study, polymer solar cells based on high-efficiency donor polymers are used in combination with a number of different electron-accepting materials. Both donors and acceptors are either fluorinated and/or chlorinated (or, in more general terms, halogenation) and compared with the non-halogenated version. To see the influence of end-group fluorination of ITIC in a photovoltaic application, the well-known donor polymers PBDB-T (PCE12) and its fluorinated and chlorinated representative, PBDB-T-2F (PM6), PBDB-T-2Cl (PM7) were used to process bulk heterojunction solar cells. Different thermal annealing during device processing is investigated from their photovoltaics parameters. Charge generation and recombination mechanism upon annealing were investigated via several optoelectronic characterization methods. Especially, Time-Delayed Collection Field (TDCF) measurements demonstrate that field-dependent charge generation and bimolecular recombination processes affect the fill factor and, thus, the efficiency of devices.
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