Fig. 3: The degree of octahedral tilt as a function of dimensionality n in RPPs.
From: Unlocking surface octahedral tilt in two-dimensional Ruddlesden-Popper perovskites
a, b Plot summarizing out-of-plane and in-plane octahedral tilt in the monolayer surface (yellow circles) and bulk interface (orange triangles) of n = 1, 2, 3, 4 RPP series according to the simulation models. The relative tilt (blue rectangles) is defined as the difference in tilt angle between monolayer and bulk octahedral tilt angle. c The distance of two apical I atoms from the top of octahedrons according to the simulation models. d–g Enlarged view of STM images scanned on freshly exfoliated RPP surfaces of n = 1–4. The measured layer-dependent apical I–I distance fits well with the simulation results. Scale bars, 0.4 nm (left part of d–g); 0.2 nm (right part of d–g). STM setpoints: Vbias = +2.3 V, I = 30 pA.
