The Effect of Antioxidants on the Stability of Perovskite Solar Cells

Abstract

Abstract The passivation of defects present in the bulk and surface of the perovskite absorbing layers of solar cells is currently the subject of intense research. To address this issue, dopants can be used to minimize the density of defects that occur at the surface and grain boundaries of perovskite films. Herein, we introduced two new antioxidants (Morin and Quercetin) in the precursor solutions to passivate the defects present in the Cs0.1FA00.9PbI3 perovskite absorbing layer. The positive impact of antioxidants on the efficiency of perovskite cells has been recently reported. However, more experimental data are needed to identify the most effective passivating agent. The time resolved photoluminescence measurements revealed that the added molecules increased the photocarrier lifetime by 120-194%. Our results showed that the optimum concentrations are 2.223 mM for Morin and 0.0156 mM for Quercetin. These results demonstrate that the new molecules are effective passivating agents and have the potential to improve the device performance. The variation of the cell power conversion efficiency as function of the concentration of the antioxidants will be discussed.