Abstract
The photophysics of charge transfer between the electron donating, surface adsorbed D149 dye and an electron accepting porous ZnO film was investigated by measuring excited state lifetimes using ultrafast transient absorption spectroscopy. We systematically varioed the production scheme of the sample including the electrolyte.
Highlights
Modern dye sensitized solar cells (DSSCs) consist of a working electrode made of a semiconducting material that can harvest and conduct electrons, with a dye bound to its surface that provides maximum sensitization to sunlight
The D149 solution shows a decrease in optical density due to the photo-initiated ground state bleaching (GSB) in a band centred around 530 nm
An increase in optical density can be observed over the entire probe spectrum red-shifted of the GSB signature for 500 fs after excitation due to excited state absorption (ESA)
Summary
Modern dye sensitized solar cells (DSSCs) consist of a working electrode made of a semiconducting material that can harvest and conduct electrons, with a dye bound to its surface that provides maximum sensitization to sunlight. The photophysics of charge transfer between the electron donating, surface adsorbed D149 dye and an electron accepting porous ZnO film was investigated by measuring excited state lifetimes using ultrafast transient absorption spectroscopy. The dye molecules absorb the sunlight and transfer the energy as electrons injected into the conduction band of the semiconductor electrode.
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