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関連する概念動画

Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
Semiconductors01:22

Semiconductors

There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
Types of Semiconductors01:20

Types of Semiconductors

Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
P-N junction01:11

P-N junction

A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
Superconductor01:24

Superconductor

A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
Schottky Barrier Diode01:27

Schottky Barrier Diode

Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...

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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

半導体半導体半導体半導体半導体半導体半導体半導体半導体半導体半導体半導体半導体半導体半導体半導体半導体半導体半導体半導体半導体半導体半導体半導体半導体半導体半導体半導体半導体半導体半導体半導体半導体半導体半導体半導体半導体半導体半導体

Yi-Hsin Liu1, Fudong Wang, Jessica Hoy

  • 1Department of Chemistry, Washington University , Saint Louis, Missouri 63130-4899, United States.

Journal of the American Chemical Society
|October 26, 2012
PubMed
まとめ
この要約は機械生成です。

コロイド性カドミウムテルリド (CdTe) 量子ワイヤーは,硫化カドミウム (CdS) シェルで25%までの高光発光効率を達成します. ワイヤの構造の変化は,その光学特性や効率に影響を与えない.

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科学分野:

  • マテリアルサイエンス 材料科学
  • ナノテクノロジー ナノテクノロジー
  • オプトエレクトロニクス (光電子機器)

背景:

  • コロイド量子ワイヤは,光電子アプリケーションのための有望なナノ材料です.
  • 半導体ナノワイヤの高光発光 (PL) 効率を達成することは,デバイスの性能にとって極めて重要です.
  • CdTe/CdSのコア/シェル構造は,そのユニークな光学特性により興味を惹きます.

研究 の 目的:

  • コロイドCdTe量子ワイヤーの高い光発光効率を報告する.
  • CdTe量子ワイヤーの光学特性に対するCdSシェルの影響を調査する.
  • CdTe量子ワイヤの光電子特性に対する構造変化の影響を決定する.

主な方法:

  • コロイドCdTe量子ワイヤーの合成.
  • CdTe量子ワイヤの単層CdSシェルの形成.
  • 低興奮力密度下での光発光効率とスペクトル特性の特徴.
  • ウルチート-亜鉛-ブレンドの交代を含む構造特性の分析.

主要な成果:

  • CdSシェルを持つCdTe量子ワイヤでは,アンサンブル光発光効率が25%に達しました.
  • CdSシェルがPLの効率を大幅に高めることを実証しました.
  • 光学特性 (放射ピーク形状,PL効率) は,CdTe量子ワイヤ内のワルツチート-亜鉛-ブレンド構造の交代から独立していることが観察されました.

結論:

  • モノレイヤのCdSシェル形成は,コロイドのCdTe量子ワイヤで高い光発光効率を達成するための効果的な戦略です.
  • 構造の変化の存在は,これらの量子ワイヤの光学性能に負の影響を及ぼさない.
  • CdTe/CdSコア/シェル量子ワイヤは,安定した光学特性を有する頑丈な材料で,さまざまな用途に適しています.