2次元赤外線スペクトロスコーピで探査された層状のPb-I-SCNペロブスキート薄膜のダイナミックに乱れた格子

Jun Nishida¹, John P Breen¹, Kurt P Lindquist¹

¹Department of Chemistry , Stanford University , Stanford , California 94305 , United States.

Journal of the American Chemical Society

|July 20, 2018

まとめ

フレキシブルなペロブスキート格子にはソーラーセルや光器の鍵がありますこの研究では,Pb-I-SCNペロフスキットの2DIR光譜を用いて,層間のスペクトル拡散と振動結合を明らかにした.

科学分野:

材料科学
スペクトロスコーピー
固体物理学

背景:

鉛ハリドペロブスキットのダイナミックに柔軟な格子は,キャリア再結合とエクシトンダイナミクスを影響する.
このダイナミクスを理解することはペロブスキート太陽電池とフォスファーの開発に不可欠です

研究の目的:

二次元赤外線 (2D IR) スペクトロスコーピーを用いて,Pb-I-SCN層のペロブスキットの構造的動態を調査する.
ペロブスキート構造内の隣接するSCN-アニオン間の振動結合を検知する.

主な方法:

Pb-I-SCNペロブスキットの薄膜がSiO2の表面で作られました.
振動信号を分離するために,S12CN-およびS13CN-アニオンの同位体希釈を使用した.
2次元赤外線 (2D IR) スペクトロスコーピーは,ブリュースター近角反射ポンプ-プローブ幾何学を用いた.

主要な成果:

4.1 ± 0. 3psの時間常数でスペクトル拡散が観察され,小さな構造変化を示した.
隣接する無機層のSCN-アニオン間の振動結合が実証された.
交差点と振動する2D帯の形状は,層間の振動結合を確認した.

結論:

この研究は,Pb-I-SCNペロブスキートにおける重要な構造動態と層間の振動結合を明らかにしている.
これらの発見は,ペロブスキットの光電子特性における格子柔軟性の役割についての洞察を提供します.
採用されたスペクトロスコピ的方法は,薄膜ペロブスキットのこのような複雑な動態を研究するのに有効です.

さらに関連する動画

11:38

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

Published on: February 27, 2017

19.1K

09:24

Visualizing Surface T-Cell Receptor Dynamics Four-Dimensionally Using Lattice Light-Sheet Microscopy

Published on: January 30, 2020

8.6K

関連する概念動画

02:33

Lattice Centering and Coordination Number

11.7K

The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...

11.7K

01:09

Infrared (IR) Spectroscopy: Overview

5.2K

When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...

5.2K

02:54

Trends in Lattice Energy: Ion Size and Charge

26.8K

An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:

26.8K

01:12

Bewley Lattice Diagram

1.5K

The Bewley lattice diagram, developed by L. V. Bewley, effectively organizes the reflections occurring during transmission-line transients. It visually represents how voltage waves propagate and reflect within a transmission line, making it easier to understand the complex interactions that occur.

1.5K

01:13

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

1.3K

Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
The ATR process begins by directing a beam...

1.3K

02:18

Intrinsically Disordered Proteins

19.6K

Intrinsically disordered proteins are a group of proteins that do not fold into specific three-dimensional structures. Their structural flexibility allows them to complement ordered proteins to perform functions that are inaccessible to rigid structures. They are more common in eukaryotes than prokaryotes and may either be exclusively intrinsically disordered or hybrid proteins, consisting of a mix of ordered and disordered regions. The absence of a rigid structure in these proteins can be...