Deposition of Reduced Graphene Oxide Thin Film by Spray Pyrolysis Method for Perovskite Solar Cell

The Perovskite absorber layer, the electron transport layer (ETL), hole (HTL), and transparent conducting oxide (TCO) are major components that make up a solar cell. Between ETL HTL, is sandwiched, on which electron-hole pairs created after absorption of radiation. Despite substantial progress toward efficiency, long-term stability still remains serious concern. Present work focuses contributing later issue by adopting Titanium dioxide (TiO2) as reduced graphene (rGO) HTL. Specifically, in present work, we report our efforts preparation compact titanium (C-TiO2) mesoporous (M-TiO2) layers an thin film C-TiO2 was spin casted FTO glass followed casting M-TiO2 using Doctor Blading technique. Similarly, rGO produced spray over substrate. asprepared HTL were characterized measuring their optical properties (transmittance reflectance films). Then, bandgap, Eg extracted from transmittance curves for respectively. In case rGO, found value to be 2.1 eV, varies between 2.7eV 0.02eV depending upon its reduction level based previously reported values. bandgap 4.51 eV 4.12 addition , 0.9 1.1 higher than However, shows decreasing trend employing M- TiO2 C-TiO2. cell, both will investigated.