Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 10, Issue 28, Pages 10389-10395Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2tc01344d
Keywords
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Funding
- National Natural Science Foundation of China [21975031, 51933001, 21734009]
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End-group modification of non-fullerene acceptors is effective in optimizing the performance of organic solar cells. The introduction of a phenoxy group can decrease planarity, increase solubility, and elevate energy levels. The substituent position of the phenoxy group can affect the morphology of blend films and the photovoltaic performance of the device.
End-group modification of non-fullerene acceptors is an effective means of optimizing the device performance of organic solar cells (OSCs). Here, we design and synthesize two isomeric terminal groups which simultaneously carry an electron-withdrawing fluoro group and an electron-donating phenoxy group. The introduction of a phenoxy group decreases the planarity of the terminal unit, enhances the solubility of acceptors and elevates the energy levels of acceptors. In addition, we find that the substituent position of the phenoxy group of the terminal unit can affect the packing behavior of the acceptors and the morphology of the blend films, thereby affecting the photovoltaic performance of the device. The optimized PBDB-T:Y-G42-based OSCs give a PCE of 15.24%, which is much higher than that of the devices based on PBDB-T:Y-G41 (12.12%) and PBDB-T:Y-F (12.53%). Our results demonstrate that the introduction of bulky substituents to the terminal unit is an effective means of tuning the solubility of NFAs and the morphology of blend films, and ultimately regulating the performance of OSCs.
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