Development of New Donor-Acceptor Copolymers Containing 3,8-Difluoro Indoloindole and Benzothiadiazole Deriatives
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Organic solar cells (OSCs) have received powerful attention because of their light, low cost, flexible photovoltaics properties. In this report, the new 3,8-difluoro-indolo[3,2-b]indole (IDID) donor unit was developed for organic electronic applications. Novel donor-accept copolymers based on PFDHI-THT, PFDHI-TFT, PFDHI-T2FT were prepared using notorious benzothiadiazole derivatives including fluorine atoms as the acceptors. The optical, electrochemical, thermal properties of these all new synthesized copolymers were characterized. The solar cell using PFDHI-TFT as donor showed PCE of 5.98% with VOC of 0.80 V, JSC of 10.56 mA cm–2 and FF of 0.71, respectively, under AM 1.5G illumination (100 mW/cm2) in the absence of annealing.