Lead-Halide Scalar Couplings in ²⁰⁷Pb NMR of APbX₃ Perovskites (A = Cs, Methylammonium, Formamidinium; X = Cl, Br, I).

ABSTRACT: Understanding the structure and dynamics of newcomer optoelectronic materials - lead halide perovskites APbX₃ [A = Cs, methylammonium (CH₃NH₃⁺, MA), formamidinium (CH(NH₂)₂⁺, FA); X = Cl, Br, I] - has been a major research thrust. In this work, new insights could be gained by using ²⁰⁷Pb solid-state nuclear magnetic resonance (NMR) spectroscopy at variable temperatures between 100 and 300 K. The existence of scalar couplings ¹J_Pb-Cl of ca. 400 Hz and ¹J_Pb-Br of ca. 2.3 kHz could be confirmed for MAPbX₃ and CsPbX₃. Diverse and fast structure dynamics, including rotations of A-cations, harmonic and anharmonic vibrations of the lead-halide f

SUBMITTER: Aebli M 

PROVIDER: S-EPMC7237655 | biostudies-literature | 2020 May

REPOSITORIES: biostudies-literature