AUTHOR=Long Biyu , Zhou Xianzi , Cao Huafeng , Chen Renjie , He Nannan , Chi Lina , Fan Penghui , Chen Xiaohong 

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

JOURNAL=Frontiers in Materials

VOLUME=Volume 9 - 2022

YEAR=2022

URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2022.892657

DOI=10.3389/fmats.2022.892657

ISSN=2296-8016

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