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Changing the Direction and Orientation of Electric Field During Electric Pulses Application Improves Plasmid Gene Transfer in vitro
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Flipping Molecules over on TiO2 Surfaces with Light and Electric Fields.

Renato N Sampaio1, Guocan Li1, Gerald J Meyer1

  • 1Department of Chemistry , The University of North Carolina at Chapel Hill , Murray Hall 2202B , Chapel Hill , North Carolina 27599-3290 , United States.

Journal of the American Chemical Society
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PubMed
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Light causes dye molecules on TiO2 to flip, then flip back. This molecular flipping, driven by electric fields, affects charge recombination in solar cells.

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Area of Science:

  • Materials Science
  • Photochemistry
  • Nanotechnology

Background:

  • Dye-sensitized solar cells (DSSCs) rely on efficient electron transfer from sensitizers to semiconductor oxides.
  • Understanding molecular behavior at the semiconductor interface is crucial for optimizing device performance.
  • The role of electric fields generated by excited states in molecular orientation is not fully understood.

Purpose of the Study:

  • To investigate the light-induced reorientation (flipping) of a ruthenium-based sensitizer anchored to TiO2.
  • To determine the influence of this molecular flipping on charge recombination dynamics.
  • To explore the role of electric fields at the semiconductor interface in driving molecular motion.

Main Methods:

  • Spectroscopic analysis of [Ru(NH3)5(eina)](PF6)2 sensitizer on anatase TiO2 nanocrystallites.
  • Time-resolved studies using pulsed light excitation to monitor flipping and charge recombination.
  • Spectro-electrochemical measurements to investigate thermal reduction effects on sensitizer orientation.

Main Results:

  • Light excitation induced sensitizer flipping and excited-state electron injection.
  • Flipping was absent with carboxylic acid derivatives or SnO2/TiO2 core/shell structures.
  • Charge recombination was faster when the oxidized sensitizer was flipped over, indicating stronger electronic coupling.
  • Kinetic isotope effects were measured for recombination (26.7) and flipping (0.12).
  • Thermal reduction initiated flipping but required significantly higher electric fields than light excitation.

Conclusions:

  • Electric fields generated at illuminated semiconductor interfaces are sufficient to reorient surface-anchored molecules.
  • Sensitizer flipping significantly impacts charge recombination rates, influencing overall device efficiency.
  • The findings provide insights into interfacial charge transfer mechanisms and molecular dynamics in nanomaterials.