Fig. 3
From: Light- and bias-induced structural variations in metal halide perovskites
Effect of applying positive and negative bias to the film surface. a Graph of average amplitude signals under different bias. b Line profile of black line in d, and red line in f; PFM c out-of-plane amplitude map and d out-of-plane phase map under bias voltage of +2 V; e out-of-plane amplitude map and f out-of-plane phase map under bias voltage of −0.2 V
