Effect of tin concentration on the morphological & crystal structure, and optical properties of chemical vapor deposited MAPb1_xSnxI3 perovskite films for 0 x 0.5
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS(2023)
摘要
In this article, we evaluate the impact of Sn proportion on the morphology and crystal structure, and its influence on the optical properties of MAPb(1-x)Sn(x)I(3) (0 <= x < 0.5) perovskite films. The uniform and compact Sn-Pb halide films with a variety of grain sizes were deposited using a low-pressure chemical vapor deposition (LP-CVD) system and were sequentially converted into perovskite films. Rutherford backscattering spectrometry (RBS) measurements were performed to determine the depth profile of elements and the simulated spectra suggested multilayered films. The x-ray diffraction (XRD) patterns confirmed the formation of the perovskite phase, i.e. tetragonal structure with I4cm space group. The energy bandgap (E-g) and the Urbach energy (E-u) approximation insinuate a tradeoff between the attainment of low bandgap Sn-Pb halide perovskites and defect-disorder tolerant films.
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关键词
Low-pressure chemical vapour deposition,Binary metal halide perovskite films,Rutherford backscattering spectrometry,Morphology,Crystal structure,Optical properties
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