稳定的倾斜八面体化物矿抑制局部形成的性能限制阶段
Tiarnan A S Doherty1, Satyawan Nagane1, Dominik J Kubicki1,2
1Department of Physics, Cavendish Laboratory, University of Cambridge, Cambridge, UK.
Science (New York, N.Y.)
|December 23, 2021
概括
稳定光伏的形式 (FA) 矿需要了解八面体倾斜. 在FA矿薄膜中设计这种倾斜增强了抗退化的稳定性,提高了太阳能电池的性能.
科学领域:
- 材料科学
- 固态化学
- 太阳能发电
背景情况:
- 基于 (FA) 的化矿对高效光伏至关重要.
- 稳定这些矿的光活性立方相 (α-FAPbI3) 是一个重大挑战.
- 目前的稳定方法涉及经验性合金 (例如,甲基).
研究的目的:
- 研究经验稳定的富含FA的矿的结构性质.
- 了解八面倾斜在矿相位稳定的作用.
- 开发一种替代方法来稳定α-FAPbI3而无合金.
主要方法:
- 解决局部八面体倾斜的先进纳米结构特征技术.
- 分析合金矿薄膜中的阴离子分布.
- 使用乙烯基二胺四酸 (EDTA) 诱导纯α-FAPbI3膜的八面倾斜的表面工程.
主要成果:
- 经验稳定的富含FA的矿具有非立方体结构,倾斜度为2°.
- 八面体倾斜阻碍过渡到不稳定的六边形相,增强宏观稳定性.
- 异质离子分布导致局部不稳定性和性能损失.
- 经过EDTA模板的纯α-FAPbI3薄膜显示出对热,环境和光应激因素的显著稳定性.
结论:
- 八面体倾斜是稳定基于FA的矿光活性阶段的关键.
- 表面工程提供了一个有前途的途径,可以在不影响性能的情况下实现稳定的α-FAPbI3膜.
- 这种方法可以产生更耐用,更高效的矿太阳能电池.
更多相关视频
11:38Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
Published on: February 27, 2017
18.7K
04:14Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
Published on: October 1, 2019
13.2K
相关概念视频
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
45.1K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
45.1K
02:42Ionic Crystal Structures
15.5K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
15.5K
02:58Crystal Field Theory - Octahedral Complexes
28.2K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
28.2K