engleski

TiO2 nanotubes arrays on conductive glass as base for perovskite solar cells

TiO2 is known as material with excellent chemical and photochemical stability. It exists in three different crystalline phases: anatase, rutile and brookite. It was found that anatase is photocatalytically more active than rutile due to its large surface area. This activity depends not only on the phase of TiO2 but also on the crystallite size and porosity. The morphology parameters, e.g., nanotube length, diameter, smoothness, depend on the anodization conditions, such as voltage, electrolyte composition, temperature, and duration. After anodization, the amorphous nanotubes can be annealed to increase the electron mobility, sensitized with dyes or polymers to increase solar photon absorption, and doped or surface-functionalized to adjust the density of states1. On the other hand, perovskite type of solar cells are one of the hottest prospects in clean energy research, offering good power outputs from low-cost materials that are relatively simple to process into working devices. Perovskite solar cells based on organometal halides represent an emerging photovoltaic technology. Perovskite solar cells stem from dye-sensitized solar cells. In 2009 was reported the first developed perovskite based solar cell structure with conversion effieciency of 3-4%, and up to now increase to 20.1 %2. Lately we focus our research on investigation of the synthesis uniform and higly ordered TiO2 arrays nanotubes at different transparent substrate (glass, ZnO/glass). The thin layers of Ti film will be obtained by vapor deposition and magnetron sputtering. Also, the both oxides, ZnO and TiO2 will be used to form nanocomposite. In that way, the nanostructure of one material coupled with another material form a composite in the nanoscale resulting in variety of properties different from the original material that enable tuning its property as desired. The main aim of these project will be to deposited the perovskite materials into different pore size and different length of TiO2 nanotube arrays at different substrate. We will study how the different size properties of nanotubes and perovskite crystals size influence on the efficiency of solar cells. By changing the size of perovskite crystals is possible tune the maximum of absorbance in the desired region of solar irradiation. The all prepared samples will be studied by HRSEM, HRTEM, Raman spectroscopy, Impendance spectroscopy, UV-Vis-NiR spectroscopy. It will be discussed different way of preparation TiO2 nanotube arrays and dimensions on optical properties and efficiency of solar cells.

TiO2 nanotubes arrays; transparent substrate; perovskites; scanning electron microscopy; solar cells

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