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Efficient Electron Injection from Acyloin-Anchored Semisquarylium Dyes into Colloidal TiO2 Films for Organic Dye-Sensitized Solar Cells
- Source :
- The Journal of Physical Chemistry C. 118:6612-6623
- Publication Year :
- 2014
- Publisher :
- American Chemical Society (ACS), 2014.
-
Abstract
- Semisquarylium dyes use a novel acyloin anchor group to strongly bind to TiO2 semiconductors. Efficient acyloin anchor mediated electron injection into nanocrystalline TiO2 is demonstrated, allowing highly efficient dye-sensitized solar cells with IPCEs > 80%. The acyloin anchor can thus be viewed as a true alternative to the standard carboxylic acid anchor group. The opto-electronic and electron injection properties of the most basic semisquarylium dye SY404 are compared to the modified semisquarylium dye DD1 and the carboxylic acid anchored indoline dye D131 using a combination of ultrafast and photoemission spectroscopy. For SY404, ultrafast injection times of ∼50 fs are found despite a small energetic driving force between dye excited states and TiO2 conduction band minimum. This is possible due to the strong electronic coupling of the semisquarylium dyes to the TiO2 surface mediated by the acyloin anchor. For a better overlap with the solar spectrum, the semisquarylium dyes are modified by substituti...
- Subjects :
- chemistry.chemical_classification
Photoemission spectroscopy
business.industry
Carboxylic acid
Photochemistry
Nanocrystalline material
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Coupling (electronics)
Colloid
chemistry.chemical_compound
General Energy
Semiconductor
chemistry
Excited state
Indoline
Physical and Theoretical Chemistry
business
Subjects
Details
- ISSN :
- 19327455 and 19327447
- Volume :
- 118
- Database :
- OpenAIRE
- Journal :
- The Journal of Physical Chemistry C
- Accession number :
- edsair.doi...........ca8d0a5a47183410c75cb15abbf95a6f