Science outlines unified durability tests for perovskite and tandem solar modules
Priya Nair ·
An international team led by researchers at the U.S. National Renewable Energy Laboratory and King Abdullah University of Science and Technology on Thursday published a unified durability testing protocol for perovskite and perovskite–silicon tandem photovoltaics in Science. The study aligns accelerated lab stress tests with the dominant failure modes observed outdoors, a gap that has slowed insurance, certification, and bank financing for first commercial products.
The authors report results from a multi‑lab round‑robin on mini‑modules and pre‑production laminates, then propose a minimum test matrix that captures humidity, heat, light, electrical bias, and mechanical stress interactions. The protocol is positioned to inform updates to IEC 61215 and to standardize warranty language as manufacturers plan pilot deployments into 2026 and 2027.
What the team measured The group aggregated data from parallel exposures in climate chambers and outdoor arrays across hot‑humid, hot‑dry, and temperate sites operated by NREL in Colorado, KAUST in Saudi Arabia, and Helmholtz‑Zentrum Berlin. They tracked power loss, open‑circuit voltage decay, series resistance growth, spectral response, and electroluminescence features to identify failure signatures such as ion‑migration‑driven interfacial breakdown and moisture‑assisted halide segregation.
They then benchmarked which accelerated conditions best predict those signatures. Sequences that combine elevated temperature, controlled humidity, one‑sun equivalent illumination, and forward bias reproduced most field‑relevant degradation in weeks rather than months. The paper recommends standardized reporting of encapsulant type, barrier film water vapor transmission, electrode stack, and ion‑blocking interlayers to support cross‑lab comparability.
Why it matters for engineers and policymakers For device engineers, the work clarifies which stack choices most influence stability under bias and damp heat, and it flags when barrier films or interlayers mitigate vacancy and ion drift. For reliability teams, it provides a transparent stability metric that weights energy yield over time, improving comparisons across recipes and test sites.
For regulators and insurers, the authors map their protocol to existing IEC sequences and propose pass–fail thresholds tied to power retention and failure modes rather than single‑parameter drift. That framing is intended to shorten the gap between materials advances reported in journals and the evidence banks require before underwriting multi‑year performance guarantees.
The study cites contributions from principal investigators including Joseph Luther at NREL, Stefaan De Wolf at KAUST, and Steve Albrecht at Helmholtz‑Zentrum Berlin, with additional participation from Sandia National Laboratories and industrial partners supplying laminates. The authors emphasize that their findings do not certify any specific product, and they note that longer multi‑year field datasets are still needed to validate stress‑field correlation in harsher climates.
If adopted by standards bodies and due‑diligence firms, a single, field‑anchored protocol would lower the transaction costs that keep new PV materials from market, shifting competition toward manufacturing scale and supply chains rather than bespoke test definitions.