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Thin Films Interface Parameters in TiO2 Nanotube Based DSSC Solar Cell (CROSBI ID 638619)

Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija

Mandić, Vilko ; Moguš-Milanković, Andrea ; Gracin, Davor ; Gajović, Andreja ; Plodinec, Milivoj ; Juraić, Krunoslav ; Kereković, Irena ; Meljanac, Daniel Thin Films Interface Parameters in TiO2 Nanotube Based DSSC Solar Cell // Abstracts / Peng, Shou (ur.). Peking: The Chinese Ceramic Society, 2016. str. 372-x

Podaci o odgovornosti

Mandić, Vilko ; Moguš-Milanković, Andrea ; Gracin, Davor ; Gajović, Andreja ; Plodinec, Milivoj ; Juraić, Krunoslav ; Kereković, Irena ; Meljanac, Daniel

engleski

Thin Films Interface Parameters in TiO2 Nanotube Based DSSC Solar Cell

In the modern dye sensitized solar cell (DSSC) the TiO2 nanotube (NT) layer is concerned as a critical one for enabling high efficiency electron transport between dye and electrode. The Ti anodization process was introduced as a convenient way to produce the TiO2 NT with various geometry. Understanding of the transport mechanisms and related favourable the TiO2 NT geometry as well as especially achieving TiO2 NT in a reproducible preparation process is still a matter of controversy and acts as a milestone in the future upgrade of the DSSC solar cell performance. This investigation aims to investigate the suitable TiO2 NT layer and its interaction to adjacent layers for obtaining a TiO2 NT DSSC with enhanced performance. The thin film of ZnO and the subsequently Ti film were sputtered onto quartz glass substrate by the anodization process in NH4F electrolyte of various concentrations under different current. It is well known the thin film parameters depend on sputtering and anodization conditions. Therefore every step of samples preparation was characterised using X-ray diffraction (XRD), grazing-incidence small-angle scattering (GISAXS), scanning electron microscopy (SEM) and thermally dependent solid state impedance spectroscopy (IS). The obtained data were used to determine final preparation procedure. As prepared samples were annealed in order to yield transformation from amorphous to crystalline TiO2 NT. Final samples were also investigated using XRD, GISAXS, SEM and IS methods. During characterisation process special attention was focused on the thin film interfaces since the formation of TiO2 NT strongly depends on morphology which in turns has an effect on the efficiency of the solar cell. In the literature we can observe much attention is dedicated to the geometry of anodization derived TiO2 NT layers, as it is presumed it is mainly responsible for the solar cell performance efficiency. This results of this work show the interface of TiO2 NT layer may significantly attribute to the advantageous or disadvantageous behaviour of the cell. It was found the prepared samples yield some difference in surface morphologies. Based on that, samples having different morphologies were also found to exhibit different interface properties. Namely, growth of the TiO2 NT is known to depend on the basic anodization parameters. Furthermore, these changes may not arise solely as the consequence of the somewhat different starting parameters in the anodization process but also may be determined by the adjacent surface, i.e. by parameters of the previously prepared layers. So for advanced application precise tailoring of enlarged number of parameters is required. In order to enable these upgrades layers were investigated for structural type, microstructure, surface condition, geometry. Thin film layers of the sputtered Ti, ZnO even glass substrate and their interaction were identified as additional factors determining the final composite properties in our investigation. Some key observation are different Ti structures may occur, whereas upgrade in Ti yield less cracks. The ZnO conducting UV transparent layer was shown to be an additional factor requiring optimisation of thickness and quality. Electric behaviour was measured in the different temperatures (RT – 250 °C) and frequency (0.1 Hz – 1 MHz). It was found the changes in electric behaviour depend on the anodization process and are further related (could be correlated) to the glass substrate, ZnO and TiO2 NT layers structural and morphological properties. This work offer valuable date on the often used layers for the preparation of DSSC solar cell. Best samples containing of glass substrate - ZnO thin film - Ti thin film - TiO2 NT thin film layers were found to be favourable for the DSSC solar cell assembly.

TiO2 nanotubes; DSSC Solar Cell; Impedance

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Podaci o prilogu

372-x.

2016.

objavljeno

Podaci o matičnoj publikaciji

Abstracts

Peng, Shou

Peking: The Chinese Ceramic Society

Podaci o skupu

24th International Congress on Glass

predavanje

07.04.2016-11.04.2016

Šangaj, Kina

Povezanost rada

Fizika, Kemijsko inženjerstvo, Temeljne tehničke znanosti