Natural Material from Carnauba Wax to Enhance the Moisture Stability for High-efficiency Perovskite Solar Cells

Organic-inorganic hybrid perovskites offer a lot of potential in next-generation solar cells, however they're unstable due to moisture. In this study, we developed a natural material-- tetracosanoic acid (TA) to modify the surface of CH3NH3PbI3 perovskite films to enhance the moisture stability. When maintained for 20 days in relative humidity of 25% at 25 degrees C, the power conversion efficiency (PCE) of the TA modified perovskite solar cells (PSCs) retained 85% of its initial value, whereas a pristine cell only retained 54 % of its initial value. Our findings revealed a straightforward, low-cost, and ecologically friendly way for increasing PSC moisture stability.