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Portrait of Tönu Pullerits; Photo: Kennet Ruona

Tönu Pullerits

Professor

Portrait of Tönu Pullerits; Photo: Kennet Ruona

Orbital Topology Controlling Charge Injection in Quantum-Dot-Sensitized Solar Cells

Author

  • Thorsten Hansen
  • Karel Zidek
  • Kaibo Zheng
  • Mohamed Qenawy
  • Pavel Chabera
  • Petter Persson
  • Tönu Pullerits

Summary, in English

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.

Department/s

  • Chemical Physics
  • Theoretical Chemistry
  • NanoLund: Center for Nanoscience

Publishing year

2014

Language

English

Pages

1157-1162

Publication/Series

The Journal of Physical Chemistry Letters

Volume

5

Issue

7

Document type

Journal article

Publisher

The American Chemical Society (ACS)

Topic

  • Theoretical Chemistry
  • Atom and Molecular Physics and Optics

Status

Published

ISBN/ISSN/Other

  • ISSN: 1948-7185