Encapsulation Protocol for Flexible Perovskite Solar Cells Enabling Stability in Accelerated Aging Tests

Flexible perovskite solar cells(f-PSCs)offer attractive commercial prospects in the near future,enabled by new value propositions,such as mechanical flexibility,or high specific powers.The long-term reliability of these devices requires appropriate encapsulation to prevent degradation caused by environmental factors.Here,a lamination protocol is developed,incorporating adhesive materials,barrier foils,and edge sealants,which results in a robust device hermitization.By applying the developed procedure to three different perovskite solar cell configurations(p-i-n with carbon,p-i-n with silver,and n-i with carbon),fabricated with large active areas(1 cm^(2)),the universality of this approach is demonstrated.The best devices preserved over 85%of the initial performance after a sequence of accelerated aging tests based on industry standards(compliant with the IEC 61215 and IEC 61646)comprised of 1400 h of damp heat,50 thermal cycles,and 10 cycles of the humidity-freeze test.