期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 7, 期 42, 页码 24389-24399出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ta08328f
关键词
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资金
- Natural Science Foundation of China [21971014, 21672023, 21472012]
- National Key Research and Development Program of China [2018YFA0901800]
- Thousand Youth Talents Plan of China
An outmost selenophene-functionalized electron-rich central core (indacenodithieno[3,2-b]selenophene) and a new non-halogenated A-D-A architecture non-fullerene small molecular acceptor (NF-SMA) (TSeTIC) based on indacenodithieno[3,2-b]selenophene as the central unit and thiophene-fused IC as a terminal group was designed and synthesized for high performance organic solar cells. In contrast to the similar NF-SMA (TTTIC) with an indacenodithieno[3,2-b]thiophene unit, TSeTIC exhibited a stronger and red-shifted absorption spectrum, higher highest occupied molecular orbital (HOMO) energy level, and enhanced electron mobility in neat thin films. Furthermore, a TSeTIC/PM6-based device presented higher hole/electron mobility, better phase separation features with favorable morphology, and higher charge dissociation and collection efficiency than a TTTIC/PM6-based device, resulting in remarkably improved J(sc) and FF without sacrificing the V-oc. Therefore, compared to the best PCE of 12.05% with an energy loss (E-loss) of 0.64 eV for the PM6/TTTIC device, the optimized PM6/TSeTIC device yields a significantly higher PCE of 13.71% with a higher FF of 75.9% and decreased E-loss of 0.60 eV. It is worth noting that the excellent PCE of 13.71% is the highest recorded for A-D-A structural NF-SMAs with thiophene-containing terminal groups for binary organic solar cells. These results demonstrate that the synergistic strategy of using an indacenodithieno[3,2-b]selenophene core unit and thiophene-containing IC end group is a promising avenue to enhance the PCE of non-halogenated NF-SMAs with high V-oc and FF as well as low E-loss.
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