![]() We demonstrate that it is impossible to predict the results of a light cycling test from a continuous light test without prior knowledge of the ageing patterns for a particular device architecture. Here we show the variety of short-term and long-term ageing behaviours by testing PSCs of various architectures under constant and intermitted light indoors and exposing them to natural conditions outdoors. The lack of outdoor data and considerable magnitude of meta-stability effects (or reversible changes) in PSCs’ performance over the day–night cycle makes it particularly challenging to correlate results of the commonly utilised light-soaking ageing test with outdoor experiments. Forecasting the real-world stability of perovskite solar cells (PSCs) using indoor accelerated tests is a significant challenge on the way to commercialising this highly anticipated PV technology. ![]()
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