Electron dynamics dependence on optimum dye loading for an efficient dye-sensitized solar cell
Φόρτωση...
Ημερομηνία
Συγγραφείς
Kantonis, G.
Stergiopoulos, T.
Katsoulidis, A. P.
Pomonis, P. J.
Falaras, P.
Τίτλος Εφημερίδας
Περιοδικό ISSN
Τίτλος τόμου
Εκδότης
Elsevier
Περίληψη
Τύπος
Είδος δημοσίευσης σε συνέδριο
Είδος περιοδικού
peer reviewed
Είδος εκπαιδευτικού υλικού
Όνομα συνεδρίου
Όνομα περιοδικού
Journal of Photochemistry and Photobiology a-Chemistry
Όνομα βιβλίου
Σειρά βιβλίου
Έκδοση βιβλίου
Συμπληρωματικός/δευτερεύων τίτλος
Περιγραφή
Increasing surface area and optimum dye loading are among the prerequisites for an efficient TiO(2)-based dye-sensitized solar cell (DSC), since they improve light harvesting but, at the same time, affect, in a variant way the electron dynamics in the semiconductor. Into this context, in this work, the interdependence of these two effects was investigated. The thermal annealing conditions of nanocrystalline titania films were modified between 400 and 550 degrees C in order to vary the crystallinity and the aggregation/sintering degree of the semiconductor particles. The annealing effects on the structural and surface parameters of the films were determined and the electron dynamics inside the semiconductor were elucidated. The film properties were found to correlate with the photoelectric conversion efficiencies of the corresponding DSCs in terms of light harvesting efficiency, electron transport, recombination and trapping at surface states. Despite higher dye loading, a relatively low efficiency (5.3%) was attained at the temperature of 400 degrees C, due to insufficient neck growth and the presence of surface states that were not removed by annealing. On the contrary, the highest efficiency (6.4%) was attained at 550 degrees C, where high values of electron diffusion coefficients and enhanced electron lifetimes were observed despite a significantly lower dye loading. The above results point out the significance of properly controlling both light harvesting and electron dynamics in the photoelectrode for efficient dye sensitization of a large band gap semiconductor. (C) 2010 Elsevier B.V. All rights reserved.
Περιγραφή
Λέξεις-κλειδιά
titania annealing, electron transport, recombination, dye loading, dye-sensitized solar cells, tio2 films, nanocrystalline semiconductors, photocatalytic activity, annealing temperature, charge-transfer, recombination, diffusion, transport, anatase, adsorption
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
<Go to ISI>://000286952400032
http://ac.els-cdn.com/S1010603010004296/1-s2.0-S1010603010004296-main.pdf?_tid=d5cd228bbd5f59589a2fc648500c7eb6&acdnat=1333036308_a2bc0afac1d850cce310f3c1994c411c
http://ac.els-cdn.com/S1010603010004296/1-s2.0-S1010603010004296-main.pdf?_tid=d5cd228bbd5f59589a2fc648500c7eb6&acdnat=1333036308_a2bc0afac1d850cce310f3c1994c411c
Γλώσσα
en
Εκδίδον τμήμα/τομέας
Όνομα επιβλέποντος
Εξεταστική επιτροπή
Γενική Περιγραφή / Σχόλια
Ίδρυμα και Σχολή/Τμήμα του υποβάλλοντος
Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας