Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 19, Pages 22531-22539Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c04273
Keywords
organic solar cell; nonfullerene acceptor; energy loss; high voltage; side-chain engineering
Funding
- National Natural Science Foundation of China [21822503, 51973043, 21721002, 51961135103]
- Ministry of Science and Technology of China [2016YFA0200700]
- Youth Innovation Promotion Association
- Datong Coal Mine Group
- Chinese Academy of Sciences
- Swedish Research Council VR [2018-06048]
- Swedish Strategic Research Foundation through a Future Research Leader program [FFL 18-0322]
- Swedish Research Council [2018-06048] Funding Source: Swedish Research Council
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By adjusting the molecular structure of acceptors and the length of side chains, the performance of organic solar cells can be improved with reduced energy loss.
A combination of high open-circuit voltage (V-oc) and short-circuit current density (J(sc)) typically creates effective organic solar cells (OSCs). Y5, a member of the Y-series acceptors, can achieve high V-oc of 0.94 V with PM6 but low J(sc) of 12.8 mA cm(-2). To maintain the high V-oc while increasing the J(sc) of devices, we developed a new nonfullerene acceptor, namely, BTP-C2C4-N, by extending the conjugation of a Y5 molecule with a naphthalenebased end acceptor. In comparison with Y5-based devices, PM6:BTP-C2C4-N-based devices exhibited significantly higher J(sc) of 18.2 mA cm(-2) followed by a high V-oc. To further increase the photovoltaic properties of BTP-C2C4-N analogues, BTP-C4C6-N and BTP-C6C8-N molecules with better processability and film morphology are obtained by adjusting the alkyl branched chain length. The optimized OSCs based on BTP-C4C6-N with a moderate alkyl branched chain length exhibited the best PCE of 12.4% with a high V-oc of 0.94 V and J(sc) of 20.7 mA cm(-2). Notably, the devices achieved a low energy loss of 0.49 eV (0.51 eV for Y5 system) accompanied by a small nonradiative energy loss. The results indicate that nonfullerene acceptors with extended terminal motifs and optimized branched chain lengths can effectively enhance the performance of OSCs and reduce energy loss.
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