Improvement of light-harvesting and electron injection efficiencies by lithium ion in D149-sensitized nanocrystalline TiO2 films

- Absorption spectra shifted toward the long-wavelength region when films were immersed in a Li ion solution.
- Electron injection efficiency was evaluated quantitatively by using transient absorption spectroscopy.
- Electron injection efficiency was dramatically enhanced by Li ion.
- Li ion in the electrolyte of D149-sensitized solar cell devices is essential to improve their performance.