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Probing the role of anchoring ligands in charge separation dynamics of novel zinc- phthalocyanine sensitized TiO2 films through ultrafast spectroscopy

Steen, Gerwin (2013) Probing the role of anchoring ligands in charge separation dynamics of novel zinc- phthalocyanine sensitized TiO2 films through ultrafast spectroscopy.

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Abstract:This master project is focused on zinc-phthalocyanine (ZnPc), a molecule absorbing in the red range of our solar spectrum. The high photon flux in this region makes the dye interesting to use in dye sensitized solar cells (DSSCs). Such solar cells are based on dye molecules that are adsorbed onto a highly porous nanocrystalline semiconductor, usually TiO2. After absorbing sunlight, the excited dye injects one electron into the TiO2 (the anode) conduction band on an ultrafast timescale. The electron diffuses through the anode after which it is being collected at one of the electrodes. From the electrode it travels through a load and is recollected by the platinum film (the cathode). The electron finally enters a liquid conductor that resupplies the dye with its missing electron. Recent research has shown that process rates of electron injec-tion (EI) and electron recombination greatly influence the performance of DSSCs. By modify-ing the anchoring ligand these processes rates can be controlled. In this work the dynamics of charge separation of four different anchoring ligands designs for ZnPc have been character-ised by a femtosecond transient absorption setup.
Item Type:Essay (Master)
Faculty:TNW: Science and Technology
Subject:33 physics
Programme:Applied Physics MSc (60436)
Link to this item:http://purl.utwente.nl/essays/62919
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