Fig. 3: The effect on the optical long-term stability of γ-CsPbI3 by splitting the PEGDMA content added to the CsPbI3 precursor solution. | Communications Materials

Fig. 3: The effect on the optical long-term stability of γ-CsPbI3 by splitting the PEGDMA content added to the CsPbI3 precursor solution.

From: Long-term stability in γ-CsPbI3 perovskite via an ultraviolet-curable polymer network

Fig. 3

a–e Accumulated UV–vis absorbance spectra while exposing γ-CsPbI3 (0, 0.5, 1, 3, and 5 wt% PEGDMA) to the ambient conditions for 35 days. f FE-SEM top view images of γ-CsPbI3 (0, 0.5, 1, 3, and 5 wt% PEGDMA). Scale bar: 2 μm. g Time-dependent photographic results obtained by observing the optical color change of the γ-CsPbI3 (0, 0.5, 1, 3, and 5 wt% PEGDMA) thin films during 35 days in ambient conditions. The red square box represents the limitation of γ-phase stability that begins to transition from the γ-phase to the δ-phase. h–k XPS analysis on the fresh γ-CsPbI3 (0, 0.5, 1, 3, and 5 wt% PEGDMA) at full range (h), Pb 4 f (i), I 3d (j), and Cs 3d (k).

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