用添加的Cs2AgBiBr6与1300nm近红外光响应
Hongwei Lei1,2, Utkarsh Singh2, Fuxiang Ji2
1College of Engineering, Huazhong Agricultural University, Wuhan, 430070, China.
Small (Weinheim an der Bergstrasse, Germany)
|September 20, 2024
概括
的化扩大了无化物双矿 (HDPs) 的光吸收到1400nm. 这就产生了一个子带隙状态,使近红外光电子器件的HDPs成为可能.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 光电学是指光电子产品.
背景情况:
- 像Cs2AgBiBr6这样的无化物双矿 (HDPs) 具有有前途的光电子特性.
- Cs2AgBiBr6的一个主要限制是其狭窄的吸光范围,限制了其应用.
研究的目的:
- 使用 (Pd) 兴奋剂增强Cs2AgBiBr6的吸收范围.
- 研究吸收扩展的机制及其对光电应用的影响.
主要方法:
- 在Cs2AgBiBr6宿主格子中合 (Pd).
- 用光谱测量来分析材料属性.
- 理论计算以了解兴奋剂效应和电子结构.
主要成果:
- Pd兴奋剂显著扩大了Cs2AgBiBr6的吸收光谱,大约达到1400nm.
- Pd2+离子取代Ag原子,在宿主带隙中引入一个子带隙状态.
- 亚带隙状态使光响应能够达到1300nm (NIR-II区域),这是HDP的记录.
结论:
- 是有效的补充剂,可以扩大大带间隙HDP的吸收.
- 利用子频段间隙状态是为近红外光电学定制HDP的可行策略.
- 这项研究为在NIR光电子设备中开发HDP开辟了新的途径.
相关概念视频
Photoelectric Effect
41.3K
When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
41.3K
The Photochemical Reaction Center
5.9K
Reaction centers are pigment-protein complexes that initiate energy conversion from photons to chemical entities. Therefore, photochemical reaction center is a more appropriate term that describes these complexes. The Nobel laureates Robert Emerson and William Arnold provided the first experimental evidence of photochemical reaction centers by demonstrating the participation of nearly 2,500 chlorophyll molecules for the release of just one molecule of oxygen. Despite thousands of photosynthetic...
5.9K
Photochemical Electrocyclic Reactions: Stereochemistry
2.4K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Selection Rules: Photochemical Activation
2.4K


