二次元の層状ペロフスキートにおける隣接する量子穴間のオーガーアシスト電子転送
Zixi Yin1,2, Jing Leng1, Shiping Wang1,2
1State Key Laboratory of Molecular Reaction Dynamics and Dynamics Research Center for Energy and Environmental Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
Journal of the American Chemical Society
|March 18, 2021
まとめ
研究者らは2D層のペロブスキートでオーガーの補助による電子移転を発見し,量子井戸 (QW) の間の隔離バリアを克服した. この発見により,高度な光電子機器の 調節可能な電荷輸送が可能になる.
科学分野:
- 材料科学
- 凝縮物質物理学
- ナノテクノロジー
背景:
- 二次元 (2D) の層状のペロブスキートは,自然的な複数の量子井戸 (QW) 構造として機能します.
- 光電子学におけるそれらの適用は,QWからQWのキャリア輸送を阻害するリガンドの隔離によって妨げられます.
研究 の 目的:
- 2D層のペロブスキートにおけるキャリア移転のための新しいメカニズムを調査し,報告する.
- QW間のエネルギーバリアによって課される制限に対処する.
主な方法:
- キャリアダイナミクスを観察するために一時的吸収スペクトロスコーピーを利用しました.
- 研究された (CH2NH3) 2PbI42Dペロブスキットは,特定の層数 (m=12, 18) であった.
主要な成果:
- 隣接するQW間のオーガーの補助による電子移転メカニズムを観測した.
- 長期に渡る 誘導体のような 暫定的な吸収の特徴が 量子限定のスターク効果の兆候です
- QWバンドギャップエネルギー (Eg) と比較可能な電子エネルギーバリア (Eb) を示した.
結論:
- この研究は,2Dペロブスキートにおける有効な電荷輸送経路として,オーガーの補助による電子転送を確立している.
- 光学的に調節可能なQWからQWへの充電輸送のための設計戦略を提供します.
- 光電子と光学変調アプリケーションのための2Dペロブスキットの可能性を前進させる.
関連する概念動画
The Energies of Atomic Orbitals
In an atom, the negatively charged electrons are attracted to the positively charged nucleus. In a multielectron atom, electron-electron repulsions are also observed. The attractive and repulsive forces are dependent on the distance between the particles, as well as the sign and magnitude of the charges on the individual particles. When the charges on the particles are opposite, they attract each other. If both particles have the same charge, they repel each other.
Atomic Radii and Effective Nuclear Charge
The elements in groups of the periodic table exhibit similar chemical behavior. This similarity occurs because the members of a group have the same number and distribution of electrons in their valence shells.
π Electron Effects on Chemical Shift: Overview
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0, resulting in...
Electric Field of Two Equal and Opposite Charges
Atoms generally contain the same number of positively and negatively charged particles, protons, and electrons. Hence, they are electrically neutral. However, the centers of the positive and negative charges do not always coincide. In such a scenario, the electric field of an atom may not be zero.
A separation of the positive and negative charges can lead to a weak, remnant effect of the positive and negative charges. The expectation is that the more the distance between the positive and...
A separation of the positive and negative charges can lead to a weak, remnant effect of the positive and negative charges. The expectation is that the more the distance between the positive and...
Electric Potential Energy of Two Point Charges
The electric potential energy of a test charge in a uniform eclectic field can be generalized to any electric field produced by static charge distribution. Consider a positive test charge in an electric field produced by another static positive charge. If the test charge is moved away from the static charge, then the electric field does the positive work on the test charge, and the electric potential energy of the test charge decreases as it moves away from the static charge. Here the electric...
Energy Associated With a Charge Distribution
The work done to bring a charge through a distance r is given by the potential difference between the initial and the final position. To assemble a collection of point charges, the total work done can be expressed in terms of the product of each pair of charges divided by their separation distance, defined with respect to a suitable origin. Solving this expression gives the energy stored in a point charge distribution.


