This paper focuses on the delamination of perovskite-based solar cells, building on our previously
developed stabilized peel test as a reliable method for assessing the adhesion performance
of nanoscale multilayered solar cell structures. First, we revisit the fundamentals of peel tests
and emphasize the validity of the method with stabilized peeling response, highlighting its
effectiveness in evaluating the mechanical integrity of these complex systems. Second, we challenge
the use of fracture energy as the only metric for evaluating the adhesion of photovoltaic
devices, arguing that interface strength should instead be prioritized or at least be treated
as an equivalently important critical mechanical parameter for the design of resilient structures.
In nanoscale multilayer systems, delamination typically initiates at the interface with
the lowest interface strength, which governs the localization and progression of degradation.
The fracture energy at these scales is inherently low, primarily reflecting energy dissipation
from atomic bond breakage between layers. By reaffirming the utility of the stabilized peel
test and advocating for a shift in focus toward interface strength, we aim to provide critical
guidance for future research. These insights seek to address mechanical integrity challenges
and support the commercialization of perovskite-based solar cells.
