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
a Physics and Astronomy Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451
b CRC, 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
c King Abdullah Institute for Nanotechnology, King Saud University, P.O. Box 2454, Riyadh 11451
d Energy Research Institute, King Abdulaziz City for Science and Technology (KACST), Riyadh
e Qatar Environment & Energy research institute, Doha
f Laboratory for Photonics and Interfaces, Institute of Chemical Sciences and Engineering, School of Basic Science, Swiss Federal Institute of Technology, CH-1015 Lausanne
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.

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