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Nouri, E.
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article
Performance of CoTiO3 as an oxide perovskite material for the light scattering layer of dye-sensitized solar cells
Abstract
<p>Light scattering layers can play an essential role in the transport characteristics of charge carriers and the photovoltaic performance of dye-sensitized solar cells (DSSCs). Perovskite oxide materials have recently attracted considerable attention as light scattering materials due to their optical and structural properties. Herein, we synthesized TiO<sub>2</sub>-CoTiO<sub>3</sub>composites with a facile room temperature sol-gel procedure for use as a light scattering layer in the photoanode of DSSC devices. TiO<sub>2</sub>-CoTiO<sub>3</sub>composites were applied as monolayer photoanodes and bilayered films on a nano-TiO<sub>2</sub>photoactive layer. Microstructural investigations of the composite photoanodes showed a bimodal texture consisting of CoTiO<sub>3</sub>coarse and TiO<sub>2</sub>fine particles. CoTiO<sub>3</sub>containing photoanodes exhibited a higher light scattering property and lower dye adsorption amount compared to the control pristine TiO<sub>2</sub>electrode. Photovoltaic metrics of fabricated DSSC devices with different contents of CoTiO<sub>3</sub>in mono- and bilayered configurations were recorded under simulated AM 1.5 sunlight, suggesting that the photovoltaic performance of the devices improved in the presence of the TiO<sub>2</sub>-CoTiO<sub>3</sub>scattering layer. Interestingly, no considerable difference in photovoltaic operation of CoTiO<sub>3</sub>in the mono- and bilayered configurations was achieved (i.e., photoconversion efficiency (PCE) of 7.46% and 7.67% for mono- and bilayered devices, respectively). However, their PCEs are about 80% higher than that of the control device without the light scattering layer.</p>