Electronic Structure of CH₃NH₃PbX₃ Perovskites: Dependence on the Halide Moiety

Abstract

Silicon is the second most abundant element on the Earth and one of the more abundant elements in our Solar System. Variations in the relative abundance of the stable isotopes of Si (Si isotope fractionation) in different natural reservoirs, both terrestrial (surface and deep Earth) as well as extra-terrestrial (e.g. meteorites, lunar samples), are a powerful tracer of present and past processes involving abiotic as well as biotic systems. The versatility of the Si isotope tracer is reflected in its wide-ranging applications from understanding the origin of early Solar System objects, planetary differentiation, Moon formation, mantle melting and magma differentiation on the Earth, ancient sea-water composition, to modern-day weathering, clay formation and biological fractionation on land as well as in the oceans. The application of Si isotopes as tracers of natural processes started over six decades ago and its usage has seen a sudden increase over the last decade due to improvements in mass spectrometry, particularly the advent of multicollector inductively coupled plasma mass spectrometers, which has made Si isotope measurements safe and relatively easy while simultaneously improving the accuracy and precision of measurements.

Methylammonium Lead Bromide Perovskite Battery Anodes Reversibly Host High Li-Ion Concentrations

“…This is in full agreement to values reported previously. [15][16] (Figure 1f), similar to those observed earlier. Analysis of C 1s spectra present two peaks (see Figure 2S, Supporting Information), at 285.0 eV and 290.0 eV, respectively.…”

“…Diffraction peaks are assigned similarly to those appearing in previous publications. 16 It is shown in Figure 1S (Supporting Information) how diffraction peak positions remain unaltered upon lithiationdelithiation, which informs on the integrity of the structure. Recent XRD analyses on CsPbBr 3 films after electrochemical doping reveal slight increase of the lattice constant as a consequence of lithiation, signaling negligible structural variations.…”

Probing molecule-like isolated octahedra via phase stabilization of zero-dimensional cesium lead halide nanocrystals

“…The strong bonding nature upon Mn doping is evidenced from high bond-dissociation energy of Mn–Cl (361 kJ mol −1 ) than Pb–Br bonds (247 kJ mol −1 ) 26 . The valence states and substitution of Mn 2+ ions at the isolated octahedral PbX 6 sites was reaffirmed from X-ray photoelectron spectroscopy and electron spin resonance results, respectively (Supplementary Figures 3a to 3f and Supplementary Note 3) 22,27,28 . Quantification of multiple crystalline phases (Cs 4 PbX 6 and CsPbX 3 ) in the synthesized samples were estimated using Rietveld refinement of X-ray diffraction (XRD) results.…”

Substrate-dependent electronic structure and film formation of MAPbI3 perovskites

“…139.4 eV) is observed, indicative of products containing lead in a more oxidized redox state, possibly due to the formation of PbSO 4 45, resulting from the reaction of Pb(+2) with sulfate which is always present in PEDOT:PSS. No metallic Pb(0) is observed in any of the samples or layer thicknesses, which would be positioned around 136.8 eV274748.…”