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Conjugated polymer acceptors based on fused perylene bisimides with a twisted backbone for non-fullerene solar cells
- Source :
- Polymer Chemistry. 8:3300-3306
- Publication Year :
- 2017
- Publisher :
- Royal Society of Chemistry (RSC), 2017.
-
Abstract
- In this work, we present a new strategy to use fused and twisted conjugated backbones to construct conjugated small molecules and polymers as electron acceptors for non-fullerene solar cells. The new conjugated materials containing binary perylene bisimide (PBI) units linked with coplanar thieno[3,2-b]thiophene (as trans-PBI) or twisted thieno[2,3-b]thiophene (as cis-PBI) and the corresponding conjugated polymer cis-polyPBI were developed. A fused conjugated backbone ensures good charge transport, in which the twisted polymer cis-polyPBI was found to show the highest electron mobility of 1.2 × 10ā2 cm2 Vā1 sā1 in field-effect transistors. Meanwhile, a twisted conjugated backbone effectively prevents the aggregation and crystallization of PBI units, resulting in isotropic charge transport and finely tuned micro-phase separation in bulk-heterojunction thin films. The high electron mobility and isotropic crystallinity make the fused and twisted electron acceptors achieve high power conversion efficiencies above 6% in non-fullerene solar cells, while the coplanar molecule trans-PBI as the electron acceptor shows a very low efficiency of 0.13%.
- Subjects :
- chemistry.chemical_classification
Electron mobility
Materials science
Fullerene
Polymers and Plastics
Organic Chemistry
Bioengineering
02 engineering and technology
Polymer
Conjugated system
Electron acceptor
010402 general chemistry
021001 nanoscience & nanotechnology
Photochemistry
01 natural sciences
Biochemistry
0104 chemical sciences
chemistry.chemical_compound
chemistry
Thiophene
Molecule
0210 nano-technology
Perylene
Subjects
Details
- ISSN :
- 17599962 and 17599954
- Volume :
- 8
- Database :
- OpenAIRE
- Journal :
- Polymer Chemistry
- Accession number :
- edsair.doi...........44408c3614b0e3847e8c4feb4ab830c1