Resonance State Method for Electron Injection in Dye Sensitized Solar Cells

Area of Science:

• Computational chemistry
• Materials science
• Surface science

Background:

• Understanding excited states of molecules on surfaces is crucial for applications like dye-sensitized solar cells.
• Previous studies often simplified molecule-surface interactions and solvation effects.

Purpose of the Study:

• To develop and apply a theoretical framework for examining metastable molecular excited states on solid surfaces.
• To calculate excited state lifetimes and electron injection rates for Ru-terpyridine dyes on anatase surfaces.
• To investigate the impact of molecular structure and adsorption on dye performance.

Main Methods:

• Ab initio calculations combined with resonance state theory and Green's function.
• Detailed consideration of configuration interaction and molecule-surface interactions.
• Implicit solvation model to accurately align energy levels.

Main Results:

• A formula for complex energy correction determining decay rates was derived.
• Lifetimes of excited states for Ru-terpyridine dyes on anatase were calculated.
• Adsorption structures and relative stabilities of various Ru-terpyridine dyes were determined.

Conclusions:

• Molecular structure and adsorption mode significantly affect electron injection rates.
• Accurate alignment of photoabsorption spectra and conduction band states requires solvation models.
• Key factors limiting dye injection ability were identified and discussed.