Publication date: 31st May 2020
Conjugated polymers represent a promising type semiconductor materials for organic solar cells (OSСs). The commercially competitive power conversion efficiencies (PCE) of >18.2%1 were achieved using state-of-the art conjugated polymers in single-junction device geometry. However, the synthesis of these materials is usually a multistep and complicated process impeding the commercialization of OSCs.
In this work, we designed novel conjugated polymer Tz-T4B2 based on thiazolothiazole . A straightforward synthesis of Tz-T4B2 allows to produce this polymer on a large scale and at low cost.Organic solar cells based on Tz-T4B2/[70]PCBM blends delivered high short-circuit current densities of 19.3 mA/cm2 with decent fill factors of ~60% and PCE > 7%. We believe that further molecular optimization of Tz-T4B2 structure (e.g. using fluorine substitution) and using appropriate non-fullerene acceptors might deliver higher efficiencies required for commercially feasible organic photovoltaics.
This work was financially supported by the Russian Foundation for Basic Research, (project No. 18-33-20025)
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