Influence of FK209 Cobalt Doped Electron Transport Layer in Cesium Based Perovskite Solar Cells

The efficiency and stability of perovskite solar cells (PSCs) depend not only on the film quality, but they are also influenced by charge carriers both electron hole transport layers (ETL HTL). Doping carrier is considered one effective technique applied to enhance performance PSCs. FK209 cobalt TFSI lithium salt were investigated as dopants for mesoporous TiO2 (M-TiO2) in ETL. Herein, doping offers improved conductivity, reproducibility compared other or undoped M-TiO2 control device. It has been found that an optimum concentration 2.5 mg resulted 15.6% 0.36 cm2 active device area, whereas, yielded average 10.8%. enhanced due conductivity ETL while maintaining high transparency low surface roughness with doping. doped a 90% over visible range its measured energy gap was 3.59 eV. Perovskite films deposited lower PL intensity indicating faster extraction. lifetime optimised 115.8 ns.