期刊
ACS APPLIED ENERGY MATERIALS
卷 1, 期 2, 页码 833-840出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.7b00277
关键词
perylene diimides; organic solar cells; non-fullerene acceptor; molecular configuration; steric hindrance; charge transfer
资金
- National Natural Science Foundation of China [51603100, 51773087, 21733005]
- Shenzhen Fundamental Research program [JCYJ20150630145302237]
- Shenzhen Peacock program [KQTD20140630110339343]
- US Department of Energy, Office of Science, Materials Science and Engineering Division
Three perylene diimide (PDI)-based small molecules, T2-SePDI2, T3B-SePDI3, and T4B-SePDI4, with different molecular configurations are synthesized. Due to a large steric hindrance, the molecular configuration of T3B-SePDI3 is the most distorted, followed by T4B-SePDI4, while T2-SePDI2 shows the smallest steric hindrance. Inverted bulk heterojunction solar cells based on T3B-SePDI3 and PBDB-T show the highest power conversion efficiency (PCE) of 5.82% with an open-circuit voltage of 0.98 V, a high short-circuit current density of 10.52 mA/cm(2), and a fill factor of 56.31%. The PCEs of the T2-SePDI2- and T4B-SePDI4-based devices are 4.10% and 5.10%, respectively. The results demonstrate that the molecular configuration of the PDI-based small molecule acceptor is critical and that increasing the steric hindrance is helpful in suppressing aggregation and improving device performance.
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