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Merocyanine/C60 Planar Heterojunction Solar Cells: Effect of Dye Orientation on Exciton Dissociation and Solar Cell Performance
- Source :
- Advanced Functional Materials. 22:86-96
- Publication Year :
- 2011
- Publisher :
- Wiley, 2011.
-
Abstract
- In this study the charge dissociation at the donor/acceptor heterointerface of thermally evaporated planar heterojunction merocyanine/C60 organic solar cells is investigated. Deposition of the donor material on a heated substrate as well as post-annealing of the complete devices at temperatures above the glass transition temperature of the donor material results in a twofold increase of the fill factor. An analytical model employing an electric-fielddependent exciton dissociation mechanism reveals that geminate recombination is limiting the performance of as-deposited cells. Fourier-transform infrared ellipsometry shows that, at temperatures above the glass transition temperature of the donor material, the orientation of the dye molecules in the donor films undergoes changes upon annealing. Based on this finding, the influence of the dye molecules’ orientations on the charge-transfer state energies is calculated by quantum mechanical/molecular mechanics methods. The results of these detailed studies provide new insight into the exciton dissociation process in organic photovoltaic devices, and thus valuable guidelines for designing new donor materials.
- Subjects :
- Materials science
Organic solar cell
Heterojunction
02 engineering and technology
Hybrid solar cell
010402 general chemistry
021001 nanoscience & nanotechnology
Condensed Matter Physics
Photochemistry
7. Clean energy
01 natural sciences
Acceptor
Dissociation (chemistry)
0104 chemical sciences
Electronic, Optical and Magnetic Materials
law.invention
Biomaterials
chemistry.chemical_compound
chemistry
law
Solar cell
Electrochemistry
Merocyanine
0210 nano-technology
Glass transition
Subjects
Details
- ISSN :
- 1616301X
- Volume :
- 22
- Database :
- OpenAIRE
- Journal :
- Advanced Functional Materials
- Accession number :
- edsair.doi...........bc510930f0e2b914379ac04d18e2d526