Nanocomposites and nanomaterials

Solar cells based on perovskite, titanium dioxide and a dye-sensitizer
Kobasa I.M., Kondratchuk І.V., Panasevych А.O.
Yu. Fedkovych National University of Chernivtsi,
2 Kotsyubynsky St., Chernivtsi 58012, Ukraine.
E-mail: I.Kobasa@chnu.edu.ua

Intense efforts are being spent now in the field of synthesis of new effective redox components to be used in various photocatalytic processes and energy transformation systems. Ensuring high quantum yields is the most important issue to address in the context of development of such photocatalytic compositions and the wide-zone light sensitive redox systems is one of possible approaches to achieve such yields. 
This work deals with development and investigation of efficiency of the solar cells based on perovskite CH3NH3PbI3, Degussa P25 titanium dioxide and quercetin, a representative of the flavonoids used as the sensitizer. 
Graetzel-type solar cells were obtained by various technologies of deposition of the active layer from the iodide-containing gel electrolyte on the conductive glass substrate. 
A series of the solar cells was obtained and comparative analysis of their efficiency and current-voltage characteristics has been carried out. It was shown that the perovskite-based cells ensured high efficiency and competitive characteristics. Spin-deposition of perovskite followed by treatment of the samples at 100 0C seems to be the most effective method of the active component layer formation. Results of analysis of absorption and fluorescence spectra of quercetin proved that being used as the sensitizer, this compound would ensure a smooth transfer of electrons from the excited dye molecule to conductivity zone of TiO2 resulting in high performance characteristics of Graetzel-type solar cells.