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Dual-sensitization via electron and energy harvesting in CdTe quantum dots decorated ZnO nanorod-based dye-sensitized solar cells
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2012 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 116, no 27, 14248-14256 p.Article in journal (Refereed) Published
Abstract [en]

Different-sized, 3-mercaptopropionic acid (MPA) stabilized CdTe quantum dots (QDs) have been prepared in aqueous solution, and potential cosensitization of such QDs in ZnO nanorod (NR)-based dye-sensitized solar cells (DSSCs) has been established. The results presented in this study highlight two major pathways by which CdTe QDs may contribute to the net photocurrent in a DSSC: (1) a direct injection of charge carriers from QDs to ZnO semiconductor via photoinduced electron transfer (PET) and (2) an indirect excitation of the sensitizing dye (SD) N719 molecules by funneling harvested light via Förster resonance energy transfer (FRET). The steady-state and picosecond-resolved luminescence measurements were combined to clarify the process of PET and FRET from the excited QDs to ZnO NR and SD N719, respectively. On the basis of these advantages, the short-circuit current density and the photoconductivity of the QD-assembled DSSCs with distinct architectures are found to be much higher than DSSCs fabricated with N719 sensitizer only.

Place, publisher, year, edition, pages
2012. Vol. 116, no 27, 14248-14256 p.
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Nano Technology
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URN: urn:nbn:se:kth:diva-175213DOI: 10.1021/jp3046593Scopus ID: 2-s2.0-84863816662OAI: oai:DiVA.org:kth-175213DiVA: diva2:918178
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QC 20160411

Available from: 2016-04-11 Created: 2015-10-10 Last updated: 2017-01-13Bibliographically approved

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