Dye-sensitized solar cells differ from conventional semiconductor devices in that they separate the function of light absorption from charge-carrier transport. The device is based on a 10-mm-thick optically transparent film of titanium dioxide (TiO2) particles of a few nanometers in size, coated with a monolayer of charge-transfer dye to sensitize the film for light harvesting. In the present authors\u27 review, the principal role of the TiO2 photoanode is emphasized by a detailed presentation of its characterization by different experimental methods, while the photoelectric responses of the cells, a work which is still in progress, are indicated in the references cited. Hydrolysis of Ti(IV)-isopropoxide in isopropanol by the addition of water is a suitable chemical reaction for the production of nanosized TiO2. The properties of nanosized TiO2 can be modified by the hydrolysis catalyst, pH of the solution, temperature, presence of complexing ligand and the colloidal state of TiO2 precursor. In the present work, the microstructural properties of nanosized TiO2 were studied by HREM, ED, XRD, SAXS and Raman spectroscopy. HREM was used to determine both grain and pore sizes. Electron diffraction and X-ray diffraction provided evidence of nanocrystalline anatase and brookite phases. The grain sizes of the anatase and brookite phases changed from (5±1) to (12±3) nm with an increase of the treating temperature up to 773 K, as shown by XRD. An method of determining nanosized TiO2 grain size based on low-frequency Raman scattering, is presented.Solarne ćelije senzitizirane bojom razlikuju se od klasičnih poluvodičkih uređaja u tome da imaju odvojenu funkciju apsorpcije svjetla od transporta nositelja naboja. Nov tip solarne ćelije osniva se na 10-µm-debelom, optički prozirnom filmu titanovog dioksida (TiO2) čija su zrna veličine nekoliko nm. Oksidni film je prekriven monoslojem boje za prenošenje naboja kojom se izvodi senzitacija filma za sakupljanje svjetla. U ovom se radu istražuju mikrostrukturna svojstva TiO2 nanoveličine primjenom visokorezolucijske elektronske mikroskopije, elektroske difrakcije, difrakcije X-zracenja, raspršenjem rentgenskog zračenja pod malim kutom i Ramanovog raspršenja. U zrnima TiO2 detektirani su anatas i brukit primjenom elektronske difrakcije i difrakcije X zračenja. Veličina zrna anatasa i brukita su bile od (5 1)do(12 3) nm s odgovarajućim povećanjem temperature do 773 K, što je određeno difrakcijom X-zračenja. Prikazana je nova metoda određivanja veličine zrna TiO2 nanoveličine primjenom niskofrekvencijskog Ramanovog raspršenja. Postignuto je dobro slaganje rezultata pri određivanju nanoveličine zrna TiO2 navedenim instrumentalnim tehnikama
