Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 14, Issue 4, Pages 6039-6047Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c22520
Keywords
tricyclic; intramolecular noncovalent interactions; A-pi-D-pi-A-type acceptors; organic solar cells; synthetic complexity; low cost; p-spacer
Funding
- National Natural Science Foundation of China [22075069, 51933001, 52073056, U1704137]
- Natural Science Foundation of Henan Province [212300410002]
- Henan Province [ZYQR201912163, 19zx014]
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Nonfused-ring electron acceptors have been developed with advantages of simpler synthetic routes, higher molar extinction coefficients, stronger crystallinity, and more orderly stacking. Devices based on DTC-BO-4F show outstanding power conversion efficiencies and low nonradiative voltage losses.
Nonfused-ring electron acceptors have attracted much attention in recent years due to their advantages of simple synthetic routes, high yields, low costs, reasonable power conversion efficiencies (PCEs), and so on. Herein, three simple A-pi-D-pi-A-type acceptors (DTC-BO-4F, DTS-BO-4F, and DTP-BO-4F) comprising a tricyclic fused-ring core, two 2,5-bis(alkyloxy)phenylene spacers, and two difluorinated terminal groups (DF-IC) were developed. Compared with DTS-BO-4F, DTC-BO-4F and DTP-BO-4F exhibit higher molar extinction coefficients, stronger crystallinity, and more orderly stacking. The PBDB-T:DTC-BO-4F-based blend film shows suitable phase separation and higher and more balanced charge mobilities. Finally, the photovoltaic devices based on DTC-BO-4F give an outstanding PCE of 13.26% with a small nonradiative voltage loss of 0.23 eV.
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