2, Xi’an University of Technology, Xi’an, , China
4, African University of Science and Technology (AUST), Abuja, , Nigeria
3, Baze University, Abuja, , Nigeria
Inverted perovskite solar cells with a lead acetate precursor and the architecture of glass/ITO/PEDOT:PSS/MAPbI3/PCBM/Ag have been synthesized. These cells have shown an average power conversion efficiency (PCE) of 10.8%. We have demonstrated that the addition of a zirconium acetyloacetonate (ZrAcac) buffer layer with an optimized concentration of 0.002M to 0.003M in ethanol on top of a PCBM layer which is the conventional electron transport layer has resulted in an improved PCE of 12.5%. We investigated the effect of concentration of ZrAcac on the device performance and attribute the 15% increase in the PCE (over the control device) to improved light harvesting and more efficient electron transport to the respective counter electrode.