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Achieving Balanced Charge Transport and Favorable Blend Morphology in Non-Fullerene Solar Cells via Acceptor End Group Modification
- Source :
- Chemistry of Materials. 31:1752-1760
- Publication Year :
- 2019
- Publisher :
- American Chemical Society (ACS), 2019.
-
Abstract
- Generally, the electron-withdrawing substitution on the end-capping group of the acceptor–donor–acceptor type small-molecule acceptor (SMA) narrows the optical bandgap, and the electron-donating group lifts the lowest unoccupied molecular orbital (LUMO) energy level of nonfullerene SMA, which increase the short-circuit current density (JSC) and open circuit voltage (VOC) of the organic solar cells (OSCs), respectively; however, their synergistic effect on the properties of SMA has remained elusive. Here, we first report a new end-capping group (EG), namely, 5-fluoro-6-methyl-3-dicycanovinylindan-1-one (CFDCI), that concurrently possesses an electron-withdrawing fluorine substitute and an electron-donating methyl group. A prototype SMA (namely, ITCF) based on CFDCI and its two control counterparts were prepared to fully understand the structure–property relationship that the new EG exerts on the resultant SMA. The ITCF demonstrated a moderately crystalline morphology in pristine film and more balanced char...
- Subjects :
- Materials science
Fullerene
Organic solar cell
Band gap
Open-circuit voltage
General Chemical Engineering
02 engineering and technology
General Chemistry
010402 general chemistry
021001 nanoscience & nanotechnology
SMA
01 natural sciences
Acceptor
0104 chemical sciences
chemistry.chemical_compound
chemistry
Chemical engineering
Materials Chemistry
0210 nano-technology
HOMO/LUMO
Methyl group
Subjects
Details
- ISSN :
- 15205002 and 08974756
- Volume :
- 31
- Database :
- OpenAIRE
- Journal :
- Chemistry of Materials
- Accession number :
- edsair.doi...........ffe3dcc0058e3d0993301dd91189fb47