Crystal growth, structural phase transitions and optical gap evolution of FAPb(Br1-xClx)3 hybrid perovskites (FA: formamidinium ion, CH(NH2)2+)

IF 5.5 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Nanoscale Research Letters Pub Date : 2025-01-13 DOI:10.1186/s11671-024-04179-2

Carlos A. López, Oscar Fabelo, Carmen Abia, María T. Fernández-Diaz, José A. Alonso

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Abstract

Chemically tuned organic–inorganic hybrid halide perovskites based on bromide and chloride anions CH(NH₂)₂Pb(Br_1−xCl_x)₃ (CH(NH₂)₂⁺: formamidinium ion, FA) have been crystallized and investigated by neutron powder diffraction (NPD), single crystal X-ray diffraction (SCXRD), scanning electron microscopy (SEM) and UV–vis spectroscopy. FAPbBr₃ and FAPbCl₃ experience successive phase transitions upon cooling, lowering the symmetry from cubic to orthorhombic phases; however, these transitions are not observed for the mixed halide phases, probably due to compositional disorder. The band-gap engineering brought about by the chemical doping of FAPb (Br_1-xCl_x)₃ perovskites (x = 0.0, 0.33, 0.5, 0.66 and 1.0) can be controllably tuned: the gap progressively increases with the concentration of Cl⁻ ions from 2.17 to 2.91 eV at room temperature, presenting a nonlinear behavior. This study provides an improved understanding of the structural and optical properties of these appealing hybrid perovskites.

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FAPb(Br1-xClx)3混合包晶的晶体生长、结构相变和光隙演化（FA：甲脒离子，CH(NH2)2+）。

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来源期刊

Nanoscale Research Letters 工程技术-材料科学：综合

CiteScore

11.30

自引率

0.00%

发文量

110

审稿时长

48 days

期刊介绍： Nanoscale Research Letters (NRL) provides an interdisciplinary forum for communication of scientific and technological advances in the creation and use of objects at the nanometer scale. NRL is the first nanotechnology journal from a major publisher to be published with Open Access.