Dye-sensitized solar cells (DSSCs) provide a promising alternative to conventional p–n junction photovoltaic devices due to their simple manufacturing process, low cost of materials, light weight, flexibility, good photovoltaic properties, specifically under low-light conditions, short energy payback time, and low environmental impact. This device is a sandwich type solar cell consisting of a working electrode, a counter electrode and a electrolyte. In this study, TiO2 blocking layers with different thickness (determined by the number of ALD cycles) were deposited between the transparent conductive oxide and the mesoporous TiO₂ layer using atomic layer deposition (ALD). The topography, absorption spectra of the electrodes were studied using scanning electron microscope (SEM), atomic force microscope (AFM) and UV-Vis spectrophotometer. Electrical properties of manufactured DSSCs were characterized by I-V illuminated characteristics under standard AM 1.5 radiation. Introduction of TiO2 blocking layer to the structure of DSSCs resulted in the higher electrical properties. The best performance have been obtained for solar cells with ALD-TiO2 thin film after 600 cycles of deposition.