Simple Hydrothermal Synthesis of Brookite TiO2 Nanowires and their Application in Dye-sensitized and Perovskite Solar Cells

Abdullah Aldwayyan^a, Saif Qaid^a, Idriss Bedja^b, Mahmoud Hezam^c, Joselito Labis^c, Fahad Alharbi^d^,^e, Mohammad Khaja Nazeeruddin^f

^aPhysics and Astronomy Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451

^bCRC, Department of Optometry, College of Applied Medical Sciences, King Saud University, P.O. Box 10219, Riyadh 11433, Saudi Arabia, P.O. Box 10219, Riyadh 11433

^cKing Abdullah Institute for Nanotechnology, King Saud University, P.O. Box 2454, Riyadh 11451

^dEnergy Research Institute, King Abdulaziz City for Science and Technology (KACST), Riyadh, Saudi Arabia

^eQatar Environment & Energy research institute, Doha

^fLaboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), Switzerland, Station 6, CH-1015 Lausanne, Lausanne, Switzerland

International Conference on Hybrid and Organic Photovoltaics
Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)

Ecublens, Switzerland, 2014 May 11th - 14th

Organizers: Michael Graetzel and Mohammad Nazeeruddin

Poster, Saif Qaid, 224
Publication date: 1st March 2014

Titanium dioxide (TiO₂) exists naturally in three crystalline phases: rutile, anatase and brookite. Compared to the rutile and anatase phases, the brookite phase is generally more difficult to produce in large quantities. In this work, we report the successful synthesis of nanorod-like brookite nanowires by a simple one-pot hydrothermal process. The prepared samples were characterized by X-Ray Diffraction (XRD), High Resolution Transmission Electron Microscopy (HRTEM), and Selected Area Electron Diffraction (SAED) for their crystalline properties. XRD results showed the presence of brookite/anatase mixture, with their fractions tunable with different growth parameters. HRTEM and SAED results showed that the brookite phase takes the nanorod shape, while the anatase phase has a particle-like morphology. Effect of different growth parameters on the grown morphologies, and on the brookite/anatase ratio will be presented. Efficiency and charge transport dynamics of dye-sensitized and perovskite sensitized solar cells fabricated using the grown nanowires will also be discussed in this work.

1. Yang, M. H.; P. C. Chen; et al., Anatase and brookite TiO2 with various morphologies and their proposed building block. CrystEngComm 2014, 16,441. 2. Hoang, S.; et al. Chemical bath deposition of vertically aligned TiO2 nanoplatelet arrays for solar energy conversion applications. J. Mater. Chem. A 2013, 13, 4307-4315. 3. Han, X.; et al.; Synthesis of titania nanosheets with a high percentage of exposed (001) facets and related photocatalytic properties. Journal of the American Chemical Society, 2009, 131, 3152-3153. 4. Liu, M., et al., Anatase TiO2 single crystals with exposed {001} and {110} facets: facile synthesis and enhanced photocatalysis. Chemical Communications, 2010. 46, 1664-1666. 5. Yang, H.G., et al., Solvothermal synthesis and photoreactivity of anatase TiO2 nanosheets with dominant {001} facets. Journal of the American Chemical Society, 2009, 131, 4078-4083.

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