Conducting channels of the hole transporting layer to adjacent photoactive perovskite sensitized tio2 thin films for a solar cell

A high performance perovskite solar cell is fabricated using the distinguished morphology of polyaniline nanoparticles (PANI-NPs) as an efficient hole transporting layer (HTL) with methylammonium lead iodide perovskite (CH₃NH₃PbI₃) as sensitizer. PANI-NPs are simply synthesized by the oxidative chemical polymerization of aniline monomer at 0-5°C. A reasonable solar-to-electricity conversion efficiency of ~6.29% with a high short circuit current (JSC) of ~17.97 mA/cm² and open circuit voltage (VOC) of ~0.877 V are accomplished by Ag/PANI-NPs/CH₃NH₃PbI₃/mp-anatase-TiO₂/bl- TiO₂/FTO perovskite solar cell. The transient photocurrent and photovoltage studies reveal that the fabricated solar cell shows better charge transport time, diffusion coefficient, diffusion length, and charge collection efficiency. Herein, the use of PANI- NPs as the HTL improves the charge carrier generation and the charge collection efficiency of the fabricated solar cell.