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Article Abstract
In this work, we present the ion migration of CsPbIBr under illumination and impede it by incorporating the large cations of guanidinium (GA). A series of "probe-set-probe" operations are applied to assess the photoluminescence (PL) behavior spectrally and spatially, which is correlated to the ion migration-induced phase separation, of CsPbIBr and GACsPbIBr perovskites. The local lattice distortion introduced by GA could reduce the strain gradient in GACsPbIBr to inhibit the ion migration, leading to a stable PL spectrum and enhanced device stability under light stimulation. A solar cell with an optimized stoichiometric composition of GACsPbIBr delivers comparable photovoltaic performance and improved stability compared to those of CsPbIBr-based perovskite solar cells, retaining 80% of its initial power conversion efficiency after being continuously bathed in light for 8 h under ambient conditions without encapsulation, while the CsPbIBr counterpart shows an efficiency that is <30% of its initial value under the same test condition.
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