A specific 2026 outdoor study
A paper first published in Solar RRL on June 9, 2026 reports one year of outdoor measurements on an early perovskite-perovskite-silicon triple-junction sample. Researchers from TNO and Fraunhofer ISE used repeated current-voltage measurements to follow the device's changing performance.
The study concerns a small experimental construction with a one-square-centimetre active cell area, tested in Petten in the Netherlands. It is evidence about that sample and exposure. The result should not be assigned to every perovskite device, a commercial module family or a different climate.
Read the changes across the test
The authors report an initial performance loss associated with encapsulation heating, followed by recovery outdoors. Later degradation involved the perovskite and transport layers, with changes in electrical behaviour and low-light performance. The observations show why the starting measurement and subsequent operating history both matter.
For a development review, request a time series and the conditions accompanying it rather than one retained-efficiency figure. Identify whether the reference is an initial cell measurement, an encapsulated sample or a stabilized operating value. Those choices change what a percentage actually describes.
Use electrical and physical evidence together
A buyer reviewing emerging technology can ask how the developer separated changes in current, voltage and resistance. Request the available inspection and characterization records for the tested construction. A power decline is an outcome; explaining its mechanism requires additional evidence.
Keep the active area, encapsulation recipe and exposure record attached to the result. If a supplier changes a layer or process after the trial, ask how the revised design was tested. Evidence for the earlier sample remains valuable, but it does not automatically qualify the changed construction.
Keep laboratory stress and field duration distinct
For comparisons between accelerated testing and outdoor operation, ask for the actual stress conditions and measurement method. A number of laboratory hours should not be relabelled as a number of service years without a validated relationship for the relevant failure mechanisms and environment.
Likewise, an outdoor sample study is not a complete module qualification or warranty demonstration. A project assessment still needs evidence covering the delivered format, production consistency and applicable requirements. Keep these questions visible alongside efficiency and materials cost in a technology review.
What the next evidence should contain
A useful follow-up would identify the revised construction, repeat samples and exposure locations, with electrical measurements throughout the monitoring period. It should disclose failures and changes in procedure so that improvements can be compared with the earlier design on a consistent basis.
For procurement, request dated qualification reports tied to the offered model and a clear account of remaining development work. The practical lesson from this outdoor study is to make stability measurable and construction-specific. It supports targeted research questions rather than a universal claim that long-term reliability has been solved.
Frequently asked questions
Does one outdoor test establish a commercial service life?
No. The result belongs to the tested construction, location and monitoring period and does not establish a complete product lifetime.
Can accelerated-test hours be converted directly to years outdoors?
No. Such a conversion needs a validated relationship for the relevant failure mechanisms and operating environment.
What sample does the June 2026 paper discuss?
An early perovskite-perovskite-silicon triple-junction experimental sample with a one-square-centimetre active cell area, monitored outdoors in Petten.
Use the news as a project input, then verify the scope.
This News item is editorial context. Confirm the final datasheet, applicable standard, project conditions and acceptance evidence before changing a design or purchase decision.
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