Department of Chemistry and Centre for Plastic Electronics, Imperial College London, London, SW7 2AZ, UK.
Department of Physics and Centre for Plastic Electronics, Imperial College London, London, SW7 2AZ, UK.
Adv Mater. 2018 Feb;30(8). doi: 10.1002/adma.201705209. Epub 2018 Jan 9.
A new synthetic route, to prepare an alkylated indacenodithieno[3,2-b]thiophene-based nonfullerene acceptor (C8-ITIC), is reported. Compared to the reported ITIC with phenylalkyl side chains, the new acceptor C8-ITIC exhibits a reduction in the optical band gap, higher absorptivity, and an increased propensity to crystallize. Accordingly, blends with the donor polymer PBDB-T exhibit a power conversion efficiency (PCE) up to 12.4%. Further improvements in efficiency are found upon backbone fluorination of the donor polymer to afford the novel material PFBDB-T. The resulting blend with C8-ITIC shows an impressive PCE up to 13.2% as a result of the higher open-circuit voltage. Electroluminescence studies demonstrate that backbone fluorination reduces the energy loss of the blends, with PFBDB-T/C8-ITIC-based cells exhibiting a small energy loss of 0.6 eV combined with a high J of 19.6 mA cm .
报道了一种新的合成路线，用于制备烷基化茚并二噻吩[3,2-b]噻吩基非富勒烯受体（C8-ITIC）。与报道的具有苯基烷基侧链的 ITIC 相比，新型受体 C8-ITIC 的光学带隙减小，吸收性更高，结晶倾向增加。因此，与给体聚合物 PBDB-T 的混合物表现出高达 12.4%的功率转换效率（PCE）。通过对给体聚合物进行主链氟化，得到了新型材料 PFBDB-T，进一步提高了效率。由于开路电压的提高，与 C8-ITIC 的混合物表现出高达 13.2%的令人印象深刻的 PCE。电致发光研究表明，主链氟化降低了混合物的能量损失，基于 PFBDB-T/C8-ITIC 的电池表现出 0.6 eV 的小能量损失，同时具有 19.6 mA cm 的高 J。
