Optimizations of Cs/Zr-supported TiO 2 nanostructures in electron transport layer to enhance the performance of perovskite solar cells Dr. H. M. Asif Javed 1 , Akbar Ali Qureshi 2 1 University of Agriculture, Pakistan, 2 National University of Sciences & Technology, Pakistan The evolution of the Perovskite solar cells (PSC) has been remarkable with several milestones achieved in recent years. However, the efficient charge collection and rapid electron transportation are the key parameters desirable for the development of optimized electron transport layer (ETL) in PSC. In this research work, Cs/Zr- Supported TiO 2 nanostructures were introduced as an ETL in a n–i–p planar configuration. The Cs/Zr-Supported TiO 2 nanostructures were characterized for morphological, structural and optical studies by using SEM, EDX, XRD, Raman, PL and UV-Vis spectroscopy techniques. The photocatalytic activity was investigated by CV, EIS and Tafel measurements. The superior power conversion efficiency (PCE) of 12.35 % was observed with 0.2 M Zr-doped TiO 2 based ETL in PSC. The remarkable PCE in 0.2 M Zr-doped TiO 2 nanoparticles-based PSC is attributed to significant enhancement in charge carrier extraction and due to less recombination reactions at interfaces. The stability of PSC was evaluated by thermal gravimetric analyses (TGA), which showed only 2.5 % weight loss up to 800◦C. Furthermore, it was observed that the Cs-TiO 2 nanotubes-based PSCs presented an enhanced PCE of 13.24 %, which is higher than those of the PSCs based on pure TiO 2 nanotubes. So, an enhanced PCE could be achieved by higher electron injection rate.
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