Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 5, Issue 7, Pages 1157-1162Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz5001193
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Funding
- Swedish Research Council (VR)
- Knut and Alice Wallenberg Foundation
- Swedish Energy Agency
- Lundbeck Foundation
- Lundbeck Foundation [R139-2012-12712] Funding Source: researchfish
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Quantum-dot-sensitized solar cells are emerging as a promising development of dye-sensitized solar cells, where photostable semiconductor quantum dots replace molecular dyes. Upon photoexcitation of a quantum dot, an electron is transferred to a high-band-gap metal oxide. Swift electron transfer is crucial to ensure a high overall efficiency of the solar cell. Using femtosecond time-resolved spectroscopy, we find the rate of electron transfer to be surprisingly sensitive to the chemical structure of the linker molecules that attach the quantum dots to the metal oxide. A rectangular barrier model is unable to capture the observed variation. Applying bridge-mediated electron-transfer theory, we find that the electron-transfer rates depend on the topology of the frontier orbital of the molecular linker. This promises the capability of fine tuning the electron-transfer rates by rational design of the linker molecules.
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