A rare case of brominated small molecule acceptors for high-efficiency organic solar cells
Nankai University · Donghua University · +1 more institution
Abstract
Given that bromine possesses similar properties but extra merits of easily synthesizing and polarizing comparing to homomorphic fluorine and chlorine, it is quite surprising very rare high-performance brominated small molecule acceptors have been reported. This may be caused by undesirable film morphologies stemming from relatively larger steric hindrance and excessive crystallinity of bromides. To maximize the advantages of bromides while circumventing weaknesses, three acceptors (CH20, CH21 and CH22) are constructed with stepwise brominating on central units rather than conventional end groups, thus enhancing intermolecular packing, crystallinity and dielectric constant of them without damaging the favorable…
Citation impact
- FWCI
- 22.06
- Percentile
- 100%
- References
- 80
Authors
17Topics & keywords
- Crystallinity
- Acceptor
- Steric effects
- Intermolecular force
- Organic solar cell
- Bromine
- Chlorine
- Materials science
- Affordable and clean energy