相关实验视频

Updated: Jul 4, 2025

Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance

Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance

Published on: February 27, 2017

混合矿中化物混合的带隙变化:一项第一原则研究与统计分析

Urooj Shahzadi¹, Dongwen Yang¹, Kaneez Fatima¹

¹International Laboratory for Quantum Functional Materials of Henan, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450001,China.

The journal of physical chemistry. A

|February 7, 2024

概括

这项研究优化了化物矿的带隙计算. 使用非局部范德瓦尔斯校正和HSE06混合功能,它可以准确地预测光电子应用的带间隙.

科学领域:

材料科学材料科学材料科学
计算化学的计算化学
固态物理固态物理

背景情况:

准确的理论预测化矿带间隙对于光电子应用至关重要.
现有的第一原则计算显示了与实验频段差距值的显著差异.
之前试图提高准确性涉及系统特定的功能或旋转轨道合,但取得的成功有限.

研究的目的:

为了确定一个可靠和材料独立的计算策略,准确地预测化矿带间隙.
调查非局部范德瓦尔斯 (vdW) 密度函数校正和混合函数对带隙计算的影响.
为了选混合化物矿的最佳光电子特性.

主要方法:

使用第一原理计算来研究MAPbI3,MAPbBr3和MAPbCl3.
使用非本地vdW密度函数校正 (optB86b) 进行格子参数优化.
应用了HSE06混合函数用于频段间隙计算,根据实验数据进行验证.
通过不同的化物组成研究混合化物矿.

主要成果:

与实验值相比,非局部vdW校正 (optB86b) 提供了最准确的格子参数.
混合功能HSE06,结合optB86b优化的格子参数,产生了最准确的频段间隙估计.
确定了MAPb{Br0.333I0.667) 3和MAPb{Cl0.333I0.667) 3作为有前途的材料,预测带间隙分别为1.315 eV (PBE) 和1.867 eV (HSE06),以及1.313 eV (PBE) 和1.885 eV (HSE06).
计算方法证明了带隙趋势与实验观测密切匹配.

结论:

一个强大的计算策略涉及非本地vdW校正和HSE06混合功能对于准确的化 PeroVskite带间隙预测至关重要.
这种方法对于用于光电子设备开发的化矿新材料的可靠选至关重要.
该研究强调了材料独立计算方法在推动矿研究中的重要性.

更多相关视频

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films

Published on: September 8, 2017

Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation

Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation

Published on: October 1, 2019

相关概念视频

Hybridization of Atomic Orbitals I

Hybridization of Atomic Orbitals I

The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...