Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 14, Issue 25, Pages 28807-28815Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c04530
Keywords
nonfused ring electron acceptors; molecular shapes; crystallinity; phase morphology; charge recombination
Funding
- National Natural Science Foundation of China [51933001, 52173174, 21734009, 51973031]
- Shanghai Pujiang Program [19PJ1400500]
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In this study, two nonfused ring electron acceptors (NFREAs), BTh-OC8-2F and DTh-OC8-2F, were designed and synthesized. It was found that the DTh-OC8-2F based blend film exhibited better nanoscale phase separation and higher photoconversion efficiency.
Two nonfused ring electron acceptors (NFREAs), BTh-OC8-2F and DTh-OC8-2F, with different molecular shapes are designed and synthesized. Both acceptors can form planar molecular shapes by the assistance of S center dot center dot center dot O intramolecular interactions. Differently, BTh-OC8-2F, with a linear molecular backbone and two trans-arranged side chains at the core unit, exhibits much stronger crystallinity than DTh-OC8-2, with a C-shape molecular shape and two cis-arranged steric side chains at the core unit. Thus, the DTh-OC8-2F based blend film displays a better nanoscale phase separation, more suppressed charge recombination, more efficient exciton dissociation, and lower nonradiative energy loss. Organic solar cells based on DTh-OC8-2F can deliver a power conversion efficiency of 14.13%, which is much higher than BTh-OC8-2F based ones (11.95%) and is also one of the highest values reported for organic solar cells based on NFREAs.
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