Extended Data Fig. 3: Water immersion tests.
From: Flexible perovskite/silicon tandem solar cell with a dual-buffer layer
a, XRD patterns of the samples with regulated SnOx buffer layers under different purging times. b, XRD patterns of the samples after water immersion test for 20 min. c, Tested sample structure. d, Photos of the sample surface after H2O immersion test based on different SnOx layers, fabricated with different purging times ranging from 1 s to 10 s.
