期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 35, 页码 29924-29931出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b08282
关键词
perylenediimide; nonfullerene acceptor; small molecules; 3D structure; organic solar cells; power conversion efficiency
资金
- National Basic Research Program of China (Fundamental Studies of Perovskite Solar Cells) [2015CB932200]
- National Natural Science Foundation of China [51373076, 61605075, 91433118]
- SICAM Scholarship by Jiangsu National Synergetic Innovation Center for Advanced Materials
- AcRF Tier 1, Singapore [RG8/16, RG133/14, RG 13/15]
A perylenediimide-based (PDI-based) small molecular (SM) acceptor with both an extended pi-conjugation and a three-dimensional structure concurrently is critical for achieving high-performance PDI-based fullerene-free organic solar cells (OSCs). Herein, a novel PDI-based SM acceptor has been successfully synthesized through fusing PDI units with a spiro core 4,4'-spirobi[cyclopenta[2,1-b;3,4-b']dithiophene (SCPDT) together via beta-position coupling with thiophene bridges. An enhanced absorption from 350 to 520 nm has been observed. Moreover, compared with previously reported acceptor SCPDT-PDI4, in which the PDI units and SCPDT are not fused together, the LUMO energy level of FSP (the new SCPDT-based molecule) increases. OSCs containing PTB7-Th as a donor and FSP as an acceptor have been demonstrated to show an excellent performance with a power conversion efficiency as high as 8.89%. This result might be attributed to the efficient and complementary photoabsorption, balanced carrier mobilities, and favorable phase separation in the blend film. This research could offer an effective strategy to design novel high-performance PDI-based acceptors.
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