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. 2024 Sep 30;146(40):27405–27416. doi: 10.1021/jacs.4c06659

Figure 3.

Figure 3

1H magic-angle spinning (MAS) NMR spectra of FAPbI3 + 5 mol % BnAm fabricated mechanosynthetically by liquid-assisted grinding (a), FA0.75Cs0.25Pb(I0.8Br0.2)3 + 0.3 mol % BnAm thin films (b), and FAPbI3 thin films (c) (23.5 T, 55 kHz). Insets highlight peaks corresponding to the BnFA+ additive. Spectra shown in full are quantitative. Insets are acquired using a short recycle delay to highlight the more rapidly relaxing additive nuclei. 1H-decoupled 13C MAS spectra of FAPbI3 + 5 mol % BnAm fabricated by liquid-assisted grinding (d) and BnFAI (e) (11.7 T, 15 kHz). Spectra were acquired either by 1H–13C cross-polarization (CP) or using a Hahn echo pulse sequence, to highlight the rigid and mobile organic species, respectively. (f) 1H–1H spin diffusion (SD) spectrum of FAPbI3 + 5 mol % BnAm fabricated by liquid-assisted grinding. Sections of cumulative 1D projections shown by dotted lines are enlargements of the corresponding region. (g) 127I nuclear quadrupole resonance (NQR) spectra of the radiofrequency region containing NQR transitions of 127I nuclei within α-FAPbI3 phase. All thin film materials are mechanically exfoliated to give a powder prior to measurement. (h) Schematics highlighting the modes of BnFA+ incorporation into perovskite materials (left) and the additive concentration-dependence of these incorporation modes. Molecular structures are adapted from VESTA.3 Software.56,57