Please use this identifier to cite or link to this item: https://doi.org/10.1021/jp2053053
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dc.titleEfficiency limitations in dye-sensitized solar cells caused by inefficient sensitizer regeneration
dc.contributor.authorJennings, J.R.
dc.contributor.authorLiu, Y.
dc.contributor.authorWang, Q.
dc.date.accessioned2014-10-07T09:48:52Z
dc.date.available2014-10-07T09:48:52Z
dc.date.issued2011-08-04
dc.identifier.citationJennings, J.R., Liu, Y., Wang, Q. (2011-08-04). Efficiency limitations in dye-sensitized solar cells caused by inefficient sensitizer regeneration. Journal of Physical Chemistry C 115 (30) : 15109-15120. ScholarBank@NUS Repository. https://doi.org/10.1021/jp2053053
dc.identifier.issn19327447
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/86282
dc.description.abstractIt is widely believed that the prototypical ruthenium dyes N719 and Z907 are regenerated by iodide with near unity quantum yield following photo-oxidation in dye-sensitized solar cells (DSCs). However, the incident photon-to-current efficiency (IPCE) of DSCs using these dyes decreases with increasing forward bias, limiting power conversion efficiency (η) compared to the hypothetical constant-IPCE case. This phenomenon could arise due to incomplete regeneration, but despite the important implications for cell efficiency, it has received little attention. DSCs employing electrolytes with different iodide concentrations and the Z907 sensitizer have been characterized using complementary photoelectrochemical techniques to test whether the decrease in IPCE is caused by inefficient regeneration. The results strongly suggest that this is the case, even for abnormally high iodide concentrations, where η is reduced by as much as 30% by the effect. Similar results are obtained with the N719 sensitizer. Interestingly, the predicted reduction in photovoltage is partially offset by a change in the electrostatic potential drop across the Helmholtz layer at the TiO2-electroyte interface, which has an estimated microscopic areal capacitance in the range 2.3-9.3 μF cm -2. These findings suggest that it will be important to carefully consider sensitizer regeneration kinetics and interfacial electric fields to further improve the efficiency of DSCs. © 2011 American Chemical Society.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1021/jp2053053
dc.sourceScopus
dc.typeArticle
dc.contributor.departmentMATERIALS SCIENCE AND ENGINEERING
dc.description.doi10.1021/jp2053053
dc.description.sourcetitleJournal of Physical Chemistry C
dc.description.volume115
dc.description.issue30
dc.description.page15109-15120
dc.identifier.isiut000293192100083
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