A spirobifluorene and diketopyrrolopyrrole moieties based non-fullerene acceptor for efficient and thermally stable polymer solar cells with high open-circuit voltage
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AbstractIn this study, we design and synthesize a new non-fullerene electron acceptor, SF(DPPB)(4), in which a spirobifluorene (SF) core is installed with four benzene endcapped diketopyrrolopyrrole (DPP) arms. SF(DPPB)(4) exhibits energy levels matching perfectly with those of the commonly used poly(3-hexyl thiophene) (P3HT) donor in polymer solar cells (PSCs). Furthermore, a designed cross-shaped molecular geometry helps in suppressing strong intermolecular aggregation in the P3HT:SF(DPPB)(4) blend, leading to efficient non-fullerene PSCs. The resultant devices give a maximum power conversion efficiency (PCE) of 5.16% with an extremely high open-circuit voltage (V-oc) of 1.14 V. In contrast, the devices based on P3HT:PC61BM blends provide a PCE of 3.18% with a V-oc of 0.62 V. Finally, we observe that the P3HT:SF(DPPB)(4) devices exhibit significantly improved thermal stability from that of the P3HT:PC61BM devices; upon thermal treatment at 150 degrees C for 3 h, the PCEs of P3HT:SF(DPPB)(4) devices remain unchanged, whereas those of the P3HT:PC61BM devices drop drastically to below 1%. The abovementioned results demonstrate that the new design strategy of employing a high-performance non-fullerene acceptor, SF(DPPB)(4), is promising for the future practical application of PSCs.
All Author(s) ListLi SX, Liu WQ, Shi MM, Mai JQ, Lau TK, Wan JH, Lu XH, Li CZ, Chen HZ
Journal nameEnergy and Environmental Science
Volume Number9
Issue Number2
Pages604 - 610
LanguagesEnglish-United Kingdom
Web of Science Subject CategoriesChemistry; Chemistry, Multidisciplinary; Energy & Fuels; Engineering; Engineering, Chemical; Environmental Sciences; Environmental Sciences & Ecology

Last updated on 2020-25-09 at 14:34