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Comparison of dye-sensitized ZnO and TiO2 solar cells: Studies of charge transport and carrier lifetime
KTH, Skolan för kemivetenskap (CHE), Kemi, Organisk kemi.
KTH, Skolan för kemivetenskap (CHE), Kemi, Fysikalisk kemi.
2007 (Engelska)Ingår i: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 111, nr 2, s. 1035-1041Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Nanocrystalline particles of ZnO and TiO2 of approximately equal size (-15 nm) were used to prepare mesoporous electrodes for dye-sensitized solar cells. Electron transport in the solar cells was studied using intensity-modulated photocurrent spectroscopy and revealed very similar results for ZnO and TiO2. Apparent activation energies for electron transport in nanostructured ZnO of <= 0.1 eV were calculated from the temperature dependence of transport times under short-circuit conditions. The lifetime of electrons in the nanostructured semiconductors was evaluated from open-circuit voltage decay and intensity-modulated photovoltage spectroscopy. Significantly longer lifetimes were obtained with ZnO. Despite the reduced recombination, ZnO-based solar cells performed worse than TiO2 cells, which was attributed to a lower electron injection efficiency from excited dye molecules and/or a lower dye regeneration efficiency. The internal voltage in the nanostructured ZnO film under short-circuit conditions was about 0.23 V lower than the open-circuit potential at the same light intensity. Results may be explained using a multiple trapping model, but as electrons are usually only shallowly trapped in ZnO, an alternative view is presented. If there is significant doping of the ZnO, resulting band bending in the nanocrystals will form energy barriers for electron transport and recombination that can explain the observed properties.

Ort, förlag, år, upplaga, sidor
2007. Vol. 111, nr 2, s. 1035-1041
Nyckelord [en]
zno/dye hybrid films, electron-transport, nanocrystalline tio2, thin-films, nanostructured zno, back-reaction, zinc-oxide, transient photocurrent, optical-properties, n-type
Identifikatorer
URN: urn:nbn:se:kth:diva-16460DOI: 10.1021/jp065948fISI: 000245005300075Scopus ID: 2-s2.0-33847652173OAI: oai:DiVA.org:kth-16460DiVA, id: diva2:334502
Anmärkning
QC 20100525Tillgänglig från: 2010-08-05 Skapad: 2010-08-05 Senast uppdaterad: 2017-12-12Bibliografiskt granskad

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Hagfeldt, AndersBoschloo, Gerrit
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