Optimization of a New ZnO Nanorods Hydrothermal Synthesis Method for Solid State Dye Sensitized Solar Cells Applications

• Published in: Journal of physical chemistry. C Vol. 117; no. 6; pp. 2993 - 3001
• Main Authors: Schlur, Laurent, Carton, Anne, Lévêque, Patrick, Guillon, Daniel, Pourroy, Geneviève
• Format: Journal Article
• Language: English
• Published: Columbus, OH American Chemical Society 14.02.2013
• Subjects: Applied sciences; Energy; Exact sciences and technology; Natural energy; Photovoltaic conversion; Solar cells. Photoelectrochemical cells; Solar energy; Dye-sensitized solar cell; Scanning electron microscopy; Voltage current curve; Organic dye; X ray diffraction; Absorption spectrum; Photovoltaic cell; Solar cell; Hydrothermal synthesis; Size effect; Ultraviolet spectrum; Zinc oxide; Nanorod
• ISSN: 1932-7447; 1932-7455
• DOI: 10.1021/jp305787r

We report on the growth control of zinc oxide nanorods to point out the effect of the ZnO nanorods quality on the power conversion efficiency (PCE) of transparent conductive oxide (TCO)/ZnO nanorods/dye/spiro-OMeTAD/metal electrode photovoltaic devices. A promising PCE of 0.61% was measured for the best nanorods growth conditions. A careful control of all the growth parameters during the seeds layer deposition and the hydrothermal synthesis was necessary to reach such a high PCE for this kind of device. A regular nanorod layer with a flat upper surface was obtained for ethylenediamine to zinc acetate dihydrate molar ratio equal to 1.74 and a pH of 8.2. The growth was performed at 65 °C for 2 h to avoid zinc oxide brushes deposition on the surface, arising from zinc hydroxyacetate decomposition during the hydrothermal treatment. The effect of ZnO nanorods length (ranging from 1 to 3 μm) on solar cell efficiency was tested. Although the UV–vis absorption increases when the nanorods length increases, the best photovoltaic parameters were measured for the shortest nanorods length studied (1 μm).