Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 33, Pages 27894-27901Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b06126
Keywords
star-shaped; perylene diimide; nonfullerene; organic solar cells; 3D structure
Funding
- National Natural Science Foundation of China (NSFC) [21502147, 51773160]
- Wuhan University of Technology [40122004]
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Two star-shaped helical perylene diimide (PDI) electron acceptors TPDI2 and FTPDI2 were designed and synthesized for nonfullerene organic solar cells (OSCs). The integration of helical PDIs into a three-dimensional structure provides a new strategy to tune the intermolecular interactions, and the as-cast blend films with PTB7-Th show favorable morphology as well as efficient charge transfer and separation, as evidenced by the morphology and femtosecond transient absorption (fs-TA) spectroscopy studies. A trade-off between suppressing the self-aggregation and maintaining the charge-transfer properties was achieved by FTPDI2. Using PTB7-Th as the electron donor, the FTPDI2-based non-fullerene OSCs show a high power conversion efficiency of 8.28%, without the assistance of any additives.
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