Significant performance improvement of porphyrin-sensitized TiO2 solar cells under white light illumination

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dc.contributor.authorWagner, Ken_AU
dc.contributor.authorGriffith, MJen_AU
dc.contributor.authorJames, Men_AU
dc.contributor.authorMozer, AJen_AU
dc.contributor.authorWagner, Pen_AU
dc.contributor.authorTriani, Gen_AU
dc.contributor.authorOfficer, DLen_AU
dc.contributor.authorWallace, GGen_AU
dc.date.accessioned2011-01-28T02:59:01Zen_AU
dc.date.available2011-01-28T02:59:01Zen_AU
dc.date.issued2011-01-13en_AU
dc.date.statistics2011-01-13en_AU
dc.description.abstractA significant improvement in the photovoltaic performance of porphyrin-sensitized TiO2 solar cells under white light illumination is reported. The most significant improvement occurs within the first hour of light exposure and is irreversible within at least the studied 3-month period. Heat treatment in the dark produced only moderate performance improvement, whereas light treatment using a UV long-pass filter (>475 nm) led to an improvement similar to that obtained with the full simulated AM 1.5 spectrum, suggesting that the effect is linked to the photoexcitation of the porphyrin dye molecules. Light exposure resulted in simultaneous improvements in the short-circuit current (Jsc), the open-circuit voltage (Voc), and the fill factor (FF). The Jsc improvement is attributed to better charge injection demonstrated by thin-film APCE measurements. Photovoltage decay measurements showed a factor of 2−3 increase in the electron lifetime after light exposure, accompanied by a comparable decrease in the electron diffusion coefficient. The improved electron lifetime combined with the increased Jsc resulted in increased electron densities under open-circuit conditions, leading to improved Voc. Electrochemical impedance measurements showed a reduced charge-transfer resistance for I3− reduction at the Pt counter electrode, which is thought to be responsible for the increased filling factor. Furthermore, ATR-FTIR and X-ray reflectometry measurements indicated no significant change in the dye layer morphology after light exposure. An alternative mechanism involving the photogeneration of electronic states within the band gap of TiO2 leading to improved injection, slower electron transport, and improved electron lifetime is discussed. © 2011, American Chemical Societyen_AU
dc.identifier.citationWagner, K., Griffith, M. J., James, M., Mozer, A. J., Wagner, P., Triani, G., Officer, D. L., & Wallace, G. G. (2011). Significant performance improvement of porphyrin-sensitized TiO2 solar cells under white light illumination. Journal of Physical Chemistry C, 115(1), 317-326. doi:10.1021/jp107615hen_AU
dc.identifier.govdoc3170en_AU
dc.identifier.issn1932-7447en_AU
dc.identifier.issue1en_AU
dc.identifier.journaltitleJournal of Physical Chemistry Cen_AU
dc.identifier.pagination317-326en_AU
dc.identifier.urihttp://dx.doi.org/10.1021/jp107615hen_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/2958en_AU
dc.identifier.volume115en_AU
dc.language.isoenen_AU
dc.publisherAmerican Chemical Societyen_AU
dc.subjectPorphyrinsen_AU
dc.subjectSolar cellsen_AU
dc.subjectIlluminanceen_AU
dc.subjectSwitching circuitsen_AU
dc.subjectPlatinumen_AU
dc.subjectCharge transporten_AU
dc.titleSignificant performance improvement of porphyrin-sensitized TiO2 solar cells under white light illuminationen_AU
dc.typeJournal Articleen_AU
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