Publication date: 23rd October 2020
In the last two decades organic solar cells (OSCs) have attracted a considerable attention of the research community and industry due to their advantages such as flexibility, semitransparency, cheap and simple solution-based fabrication. The development of high-performance organic solar cells requires donor and acceptor materials with optimal optoelectronic and physicochemical properties, which can be tailored by variation of alkyl side chains on the polymeric backbone [1-3].
In this work, we present the synthesis and investigation of three novel conjugated polymers based on benzodithiophene block bearing different alkyl side chains in combination with alternating 5,6-difluorobenzothiadiazole acceptor and thiophene donor units (Fig. 1).
It has been shown that modification of alkyl side chains in the benzodithiophene block noticeably impacts the optoelectronic properties of polymers. Conjugated polymer P2 bearing 2-ethylhexyl and CH3O substituents has the widest band gap of 1.72 eV and the highest HOMO energy, whereas polymer P1 loaded with n-decyl and 2-ethylhexylsulfide substituents exhibited the deep-lying HOMO (-5.7 eV) and the narrowest band gap of 1.68 eV. The properties of P1 are beneficial for achieving high open-circuit voltages and short-circuit current densities in OSCs.
Preliminary investigation of the designed polymers in OSCs processed using doctor blading technique and fullerene-based acceptors delivered promising efficiencies approaching 7.3% in case of P1 (Fig. 1). The obtained results show that the side-chain variation is a promising strategy for tuning the optoelectronic properties and photovoltaic performance of conjugated polymers.
This work was funded by the Russian Science Foundation (grant No.18-13-00205)
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