Excellent Stability of Perovskite Solar Cells Encapsulated With Paraffin/Ethylene-Vinyl Acetate/Paraffin Composite Layer

Superior encapsulation technology is important for PSCs to prolong their lifetime and realize commercial application. Paraffin/EVA/paraffin composite encapsulated layers were fabricated with the ambient environment under thermal temperature of 80°C, which has advantages simple procedures low cost. paraffin/EVA/paraffin pure EVA maintained 95 45% initial power conversion efficiency (PCE) aged 1000 h at RH 75%, respectively. Paraffin/EVA/paraffin-encapsulated immersed in water 5 h, remained 98% original PCE, far superior EVA-encapsulated PSCs. High melting point paraffin 68°C shows better than (60 55°C) paraffin, indicating that high molecular weight helps improve performance showed stability Voc layer because can inhibit defects, voids, edges metal electrodes quickly expand, decay. Therefore, combination an effective strategy, form continuous dense hydrophobic films a friendly electrode.