Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
Pump - supercontinuum probe (PSCP) transient absorption spectroscopy in the spectral range 260-1600 nm was employed to elucidate photoinduced charge carrier separation, relaxation and recombination steps involving triarylamine1 and indoline2 solar cell dyes on mesoporous thin films. Semiconductor oxides of different morphology were compared: ZnO and TiO2 thin films consisting of sintered nanoparticles as well as electrodeposited ZnO thin films prepared by using the structure-directing agents Eosin Y (EY) and Coumarin 343 (C343). In all cases, the dyes efficiently injected electrons. We observed two components, a dominant fast (< 70 fs, time-resolution-limited) and a slower injection step on the order of several hundred femtoseconds. Fast initial charge separation was intimately linked with the appearance of oscillatory structure due to a refractive index change of the ZnO films. A transient spectral shift in the picosecond range was observed and assigned to a transient Stark effect: The build-up of a local electric field between dye radical cations and conduction band electrons shifted the absorption band of the unexcited dye molecules. Longer timescales of the carrier dynamics were covered by step-scan FTIR spectroscopy, and a slightly faster cation-electron recombination on ZnO/C343 than on ZnO/EY thin films was revealed. Mesoporous sintered Al2O3 thin films with large band-gap were employed as a reference for "non-injecting" conditions. Here, metastable cation-electron pairs were formed initially which recombined, and no transient Stark effect was observed.
(1) K. Oum, O. Flender, P. W. Lohse, M. Scholz, M., A. Hagfeldt, G. Boschloo and T. Lenzer, Phys. Chem. Chem. Phys., 2014, 16, 8019.
(2) O. Flender, P. W. Lohse, J. Du, T. Oekermann, M. Scholz, K. Oum and T. Lenzer, Z. Phys. Chem., 2015, 229, 1907.
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