Article pubs.acs.org/JPCC
Observation of Multiexponential Pico- to Subnanosecond Electron Injection in Optimized Dye-Sensitized Solar Cells with Visible-Pump Mid-Infrared-Probe Transient Absorption Spectroscopy Mindaugas Juozapavicius,† Marius Kaucikas,‡ Jasper J. van Thor,‡ and Brian C. O’Regan*,† †
Department of Chemistry, and ‡Division of Molecular Biosciences, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom S Supporting Information *
ABSTRACT: We compare visible-pump mid-infrared-probe femtosecond measurement of electron injection on dyesensitized mesoporous TiO2 films immersed in neat solvent or in I−/I3− electrolyte. Results are presented for the Rupolypyridyl dyes N3 and N719 and the organic dye D149. Using N719 and the type of electrolyte required to make efficient and stable dye sensitized solar cells (DSSCs), we find multiple exponential injection dynamics, ranging from
