Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 9, Issue 2, Pages 604-610Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ee03481g
Keywords
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Funding
- National Natural Science Foundation of China [21474088, 51261130582, 91233114, 51561145001]
- Zhejiang Province Natural Science Foundation [LR13E030001]
- 973 program [2014CB643503]
- Research Grant Council of Hong Kong [2130394, T23-407/13-N]
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In 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.
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