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Abstract
Three pi-conjugated terpolymers based on the nonconventional molecular design strategy D1–D2–D1–A comprising two different multi-fused ladder-type arene electron-donating units and an electron-withdrawing unit are synthesized for organic photovoltaics.
Highlights
For better fine-tuning of the EHOMO and ELUMO levels, and, as a consequence, the bandgap of the donor materials, a nonconventional molecular design strategy, beyond the classical D–A approach, for new p-conjugated polymers with high photovoltaic performance is being explored in the field; very limited studies have been presented up to now.[25,26,27,28,29,30,31,32] Taking this into account, a facile D1–D2–D1–A p-conjugated polymer backbone is presented in this work by the addition of another multi-fused ladder-type arene as a building block between the D and A moieties in a regular alternation and not in a random approach
Silole-containing organic materials have shown higher charge transport[38] and better solar cell properties[39] compared to their carbon analogues,[40] which are mainly due to the longer Si–C bond length (1.89 Å) than the C–C bond length (1.53 Å) in the cyclopentadiene unit, allowing efficient interchain packing and strong p–p interactions.[37]. With these favourable features in mind, DTS and DFBT were combined to synthesize 4,7-bis(6-bromo-4,4-bis(2-ethylhexyl)-4Hsilolo[3,2-b:4,5-b0]dithiophen-2-yl)-5,6-difluorobenzo[c][1,2,5]thiadiazole (M1) (Scheme 1) which is expected to enforce the high coplanarity of the resulting polymer backbone and tight p–p stacking due to the presence of two fused polycyclic DTS units around DFBT and the strong non-covalent interactions (HÁ Á ÁF, SÁ Á ÁF, SÁ Á ÁN,)[41,42,43] among the different building blocks within the polymer chains
We synthesized a series of novel and well-defined terpolymers (D1–D2–D1–A) and explored their photovoltaic behaviour when blended with a nonfullerene acceptor (IEICO-4F)
Summary
For better fine-tuning of the EHOMO and ELUMO levels, and, as a consequence, the bandgap of the donor materials, a nonconventional molecular design strategy, beyond the classical D–A approach, for new p-conjugated polymers with high photovoltaic performance is being explored in the field; very limited studies have been presented up to now.[25,26,27,28,29,30,31,32] Taking this into account, a facile D1–D2–D1–A p-conjugated polymer backbone is presented in this work by the addition of another multi-fused ladder-type arene as a building block between the D and A moieties in a regular alternation and not in a random approach. The EQE spectrum of the P(DTS-BDT-DFBT):IEICO-4F device demonstrates a significantly higher photoresponse in the whole range of the spectrum as compared to the alkylthio- or fluoro-substituted terpolymer based OSC devices, resulting in higher Jsc. It is widely known that Jsc is primarily determined by the generation and dissociation of the excitons at the donor/acceptor (D/A) interfaces and the transport of the charge carriers to the electrodes.
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