Fig. 3: Perovskite–molecular contact interface properties.
From: Self-assembled bilayer for perovskite solar cells with improved tolerance against thermal stresses
a,b, GIWAXS patterns of perovskite films deposited on SAM (a) and SAB (b). c–f, TRPL spectra (c), PL spectra (d), TLM-measured resistance (e) and statistical distribution of adhesion energies from four measurements (f) for devices incorporating perovskite–SAM or perovskite–SAB interfaces. In e, the lines represent linear fits; In the boxplot in f, the medians (central lines), averages (hollow data points), quartiles and 1.5× interquartile ranges (whiskers) are shown; P in f represents load force. g,h, SEM images of buried perovskite surfaces delaminated from molecular contacts after thermal cycling tests (On SAM (g) and On SAB (h)). i,j, Electron density difference plots for perovskite/edge-on 2PACz SAM (i) and perovskite/face-on TPA moiety of SAB (j) interfaces, visualized using Visualization for Electronic and Structural Analysis (VESTA) software. Colour coding for atoms: Pb (grey), I (purple), C (brown), N (sliver grey) and H (white). A 3 × 4 periodicity with optimized lattice parameters of 19.012 Å × 25.630 Å was used in the xy plane.
