This study reports for a comparative analysis of electron transport layer with and without surface passivation. Electron Transport Layers of ZnO and ZnO-Graphene (ZGr1, ZGr2) were synthesized by Doctor Blade method and passivated using PMMA solution by Spin coating method for improving performance of Perovskite Solar Cell (PSCs). Graphene based ETL have shown more adherence and higher carrier injection in PSCs as compared to other mostly used ETLs like SnO₂, TiO₂. Thin films of ZnO and ZnO (ZGr1, ZGr2) (Graphene doping with varied concentrations) on ITO substrate were fabricated using Doctor Blade method. Characterization for analyzing morphology, optical and electrical properties was done using analytical tools that includes X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDX), UV-VIS-NIR Spectroscopy and Current Voltage (I-V) measurements. Surface Passivation was also analysed with these characterization tools to determine the effect on morphology, and opticl-electrical properties. XRD showed crystalline peaks at respective crystal planes. SEM images confirm rough and porous morphplogy along with layered structure. High reflectance was shown in UV-Vis Spectra alongwith band gap narrowing. This analytical study shows our attempt to passivate ZnO thin film using PMMA and its effect on film properties that may contribute towards the development of ETL for high performing PSCs.

Graphene, EDX, XRD, SEM