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Universal Electron Injection Dynamics at Nanointerfaces in Dye-Sensitized Solar Cells
- Source :
- Advanced Functional Materials. 22:2783-2791
- Publication Year :
- 2012
- Publisher :
- Wiley, 2012.
-
Abstract
- Initial nanointerfacial electron transfer dynamics are studied in dye-sensitized solar cells (DSSCs) in which the free energy and kinetics vary over a broad range. Surprisingly, it is found that the decay profiles, reflecting the electron transfer behavior, show a universal shape despite the different kinds of dye and semiconductor nanocrystalline films, even across different device types. This renews intuitive knowledge about the electron injection process in DSSCs. In order to quantitatively comprehend the universal behavior, a static inhomogeneous electronic coupling model with a Gaussian distribution of local injection energetics is proposed in which only the electron injection rate is a variant. It is confirmed that this model can be extended to CdSe quantum dot-sensitized films. These unambiguous results indicate exactly the same physical distribution in electron injection process of different sensitization films, providing limited simple and important parameters describing the electron injection process including electronic coupling constant and reorganization energy. The results provide insight into photoconversion physics and the design of optimal metal-free organic dye-sensitized photovoltaic devices by molecular engineering.
- Subjects :
- Coupling constant
Range (particle radiation)
Materials science
business.industry
Condensed Matter Physics
Nanocrystalline material
Electronic, Optical and Magnetic Materials
Molecular engineering
Biomaterials
Dye-sensitized solar cell
Electron transfer
Semiconductor
Chemical physics
Electrochemistry
Optoelectronics
business
Quantum
Subjects
Details
- ISSN :
- 1616301X
- Volume :
- 22
- Database :
- OpenAIRE
- Journal :
- Advanced Functional Materials
- Accession number :
- edsair.doi...........e8b29b24a5d87e8e73b29d60f6c74aab