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Effect of blocking layer to boost photoconversion efficiency in ZnO dye-sensitized solar cells
SENSOR Lab, Department of Information Engineering, University of Brescia.
Faculty of Physics, Semnan University.
SENSOR Lab, Department of Information Engineering, University of Brescia.
SENSOR Lab, Department of Information Engineering, University of Brescia.ORCID iD: 0000-0003-1785-7177
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2014 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 6, no 14, p. 11236-11244Article in journal (Refereed) Published
Abstract [en]

The effect of a ZnO compact blocking layer (BL) in dye-sensitized solar cells (DSSCs) based on ZnO photoanodes is investigated. BL is generated through spray deposition onto fluorine-doped tin oxide (FTO) conducting glass before the deposition of a ZnO active layer. The functional properties of dye-sensitized solar cells (DSSCs) are then investigated as a function of the thickness of the BL for two different kinds of ZnO active layer, i.e., hierarchically self-assembled nanoparticles and microcubes composed of closely packed ZnO sheets. Presence of BL leads to the improvement of photoconversion efficiency (PCE), by physically insulating the electrolyte and the FTO. This effect increases at increasing BL thickness up to around 800 nm, while thicker BL results in reduced cell performance. Remarkable increase in Jsc is recorded, which doubles as compared to cells without blocking layer, leading to PCE as high as 5.6% in the best cell under one sun irradiation (AM 1.5 G, 100 mW cm-2). Electrochemical impedance spectroscopy (EIS) elucidates the mechanism boosting the functional features of the cells with BL, which relies with enhanced chemical capacitance together with an almost unchanged recombination resistance, which are reflected in an increased electron lifetime. The results foresee a straightforward way to significantly improve the performance of ZnO-based DSSCs. © 2014 American Chemical Society.

Place, publisher, year, edition, pages
2014. Vol. 6, no 14, p. 11236-11244
Keyword [en]
blocking layer, dye sensitized solar cells, electron recombination, zinc oxide
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Experimental physics
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URN: urn:nbn:se:ltu:diva-5512DOI: 10.1021/am501360aScopus ID: 84905049472Local ID: 3a27737f-f1f2-40cb-90e2-005d82fd89b7OAI: oai:DiVA.org:ltu-5512DiVA: diva2:978386
Note
Upprättat; 2014; 20141115 (albvom)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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Concina, IsabellaVomiero, Alberto
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