**7. Conclusions**

In line with the impressive advances in efficiency (25.7% at laboratory scale) and cost reduction associated with the fabrication of perovskite solar modules using scalable solution deposition techniques, the protection of perovskite solar cells against extrinsic degradation factors, such as moisture, oxygen, heat, and sunlight, is a matter of intense research toward reaching the golden triangle of solar cell performance (lifetime, cost, and efficiency). As reviewed in this chapter, the particularities to improve the lifetime of the perovskite technology have demanded three main aspects:

Innovation in encapsulation materials fully compatible with the perovskite device structure from the chemical and processing frameworks. Up to date, PDMS, polyolefin, and PIB are the main candidates as encapsulants, and the complete encapsulation with edge sealing is the most promising structure to prevent H2O and O2 ingress and decrease degradation into volatile components.

Adapting the testing methods to better characterize and predict the temporal performance evolution of the perovskite devices and their failure mechanisms.

Finding alternatives to mitigate the environmental hazard of lead leakage where self-healing encapsulation structures and lead sequestrants outstand.

By consolidating all of these aspects have the potential to reach a robust encapsulation solution that paves the way for commercial perovskite solar cells.
