Extended Data Fig. 3: The orthorhombic phase for FAPbI3 at RT.
From: Strain regulation retards natural operation decay of perovskite solar cells
a,b, Temperature-dependent XRD patterns (cooling process) of perovskite films based on FAPbI3 (focused on (002)/(110) and (004)/(220) diffractions, respectively). c, Comparison of structural refinements made using cubic (α-phase), tetragonal (β-phase) and orthorhombic (γ-phase) perovskite structures. The goodness of fit values (χ2) is inset, confirming that the best fit is made with a γ-phase structure at RT.
