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関連する概念動画

Photoelectric Effect02:26

Photoelectric Effect

38.7K
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...
38.7K
The Hall Effect01:30

The Hall Effect

3.9K
Edwin H. Hall, in the year 1879, devised an experiment that could be used to identify the polarity of the predominant charge carriers in a conducting material. From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative.
3.9K
The Photochemical Reaction Center01:29

The Photochemical Reaction Center

5.1K
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...
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Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

2.2K
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
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Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

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Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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関連する実験動画

Updated: Jan 6, 2026

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
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Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

Published on: May 29, 2018

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キャリア解像度のフォトホール効果

Oki Gunawan1, Seong Ryul Pae2, Douglas M Bishop3

  • 1IBM T. J. Watson Research Center, Yorktown Heights, NY, USA. ogunawa@us.ibm.com.

Nature
|October 8, 2019
PubMed
まとめ

キャリア解像度を持つ新しいフォトホール技術は,半導体内の多数電荷とマイノリティ電荷の同時測定を可能にします. この突破は半導体デバイスの特徴付けを簡素化し,光電子デバイスの開発を強化します.

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Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform
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Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform

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関連する実験動画

Last Updated: Jan 6, 2026

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
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Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

Published on: May 29, 2018

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Uncovering Hidden Dynamics of Natural Photonic Structures Using Holographic Imaging
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Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform
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科学分野:

  • 半導体物理学
  • 材料科学
  • 光電子機器

背景:

  • 半導体デバイスの性能は,基本的な電荷キャリアパラメータ (型,密度,移動性) に依存しています.
  • 伝統的なホール測定は,主に大部分のキャリア特性を抽出します.
  • マイノリティキャリアの特徴付けには 通常別々の複雑な技術が必要です

研究 の 目的:

  • 大多数の電荷キャリアとマイノリティの電荷キャリアを同時に測定するための統一技術を開発する.
  • 半導体分析のための古典的なホール測定の能力を拡張する.
  • キャリアタイプ,密度,移動性,再結合寿命,拡散長さ,再結合係数への同時アクセスを可能にします.

主な方法:

  • キャリア解析のフォトホール技術を実装する.
  • 交差電流 (AC) フィールドのハール測定の進歩を回転平行二極線システムで利用する.
  • 式 ΔμH = d(σ2H) /dσ を適用して,ホール運動差,伝導率,およびホール係数を関連付けます.

主要な成果:

  • 大多数のキャリアとマイノリティのパラメータを同時に抽出することが示されています.
  • 鉛イオイドベースのペロブスキートを含む様々なソーラー吸収器にこの技術を成功裏に適用しました.
  • 異なる光の強度に対して キャリアパラメータをマッピングし 以前はアクセスできない情報を明らかにします

結論:

  • 航空会社によって決定されたフォトホール技術は,重要な航空会社とマイノリティの航空会社への同時アクセスを提供します.
  • この方法は,マイノリティのキャリアの伝統的なホール測定の限界を克服します.
  • この技術は,太陽光発電やその他の光電子機器に広く応用できます.