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Extended π-conjugated perylene diimide dimers toward efficient organic solar cells
- Source :
- Dyes and Pigments. 183:108736
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- A series of PDI-based small molecular acceptors (FPDI-I, FPDI-II, F2PDI-I and F2PDI-II) using 9H-fluorene as the central core and two PDI units or two PDI dimer units (PDI2) as the terminal groups have been synthesized. The optical, electrochemical and photovoltaic properties of these four acceptors have been systematically investigated. These acceptors exhibit twisted structures mainly due to the dihedral angles between the central fluorene core and the two terminal PDI units. The twisted molecular structures can effectively prevent the acceptor molecules from forming oversized aggregates. The two terminal fused PDI dimer units in F2PDI-I and F2PDI-II can enhance their molar absorption coefficients. Using PBDB-T as the donor polymer, F2PDI-I and F2PDI-II based devices exhibit higher and more balanced charge mobilities. As a result, organic solar cells (OSCs) based on PBDB-T:F2PDI-I give the best device performance with a power conversion efficiency (PCE) of 6.82%, a Voc of 0.90 V, a Jsc of 11.32 mA cm−2 and an FF of 66.65%.
- Subjects :
- Materials science
Organic solar cell
Process Chemistry and Technology
General Chemical Engineering
Dimer
02 engineering and technology
Dihedral angle
Fluorene
010402 general chemistry
021001 nanoscience & nanotechnology
Photochemistry
01 natural sciences
Acceptor
0104 chemical sciences
chemistry.chemical_compound
chemistry
Diimide
Molecule
0210 nano-technology
Perylene
Subjects
Details
- ISSN :
- 01437208
- Volume :
- 183
- Database :
- OpenAIRE
- Journal :
- Dyes and Pigments
- Accession number :
- edsair.doi...........6b46f016cf54459745a59c94bf25c13b