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Photoelectric Effect02:26

Photoelectric Effect

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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...
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Voltaic/Galvanic Cells02:47

Voltaic/Galvanic Cells

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Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Photoluminescence: Fluorescence and Phosphorescence01:23

Photoluminescence: Fluorescence and Phosphorescence

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Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...
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Photoluminescence: Applications01:14

Photoluminescence: Applications

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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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P-N junction01:11

P-N junction

1.7K
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...
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Recombination Dynamics in Thin-film Photovoltaic Materials via Time-resolved Microwave Conductivity
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フレキシ・フォト・エフェクト

Ming-Min Yang1, Dong Jik Kim1, Marin Alexe2

  • 1Department of Physics, University of Warwick, Coventry CV4 7AL, UK.

Science (New York, N.Y.)
|April 21, 2018
PubMed
まとめ
この要約は機械生成です。

科学者たちは新しい光伏メカニズムである フレキシ光伏効果を発見し 半導体を含めたあらゆる半導体における 太陽電池の効率を p-n 結合を必要とせずに 向上させました

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科学分野:

  • 材料科学
  • 固体物理学
  • 再生可能エネルギー

背景:

  • ソーラーセルにはショックリー・クエッサーの限界を超えた経路を提供している.
  • この効果には通常,非中心対称な材料 (例えば,ピエゾ電気,フェロ電気) が必要です.
  • 中心対称性半導体でこの効果を達成するための方法が必要です.

研究 の 目的:

  • どの半導体にも適用可能な新しい光伏メカニズムを実証する.
  • フレキソエレクトリック効果が 大規模な太陽光発電効果を媒介する役割を調査する.
  • シリコンなどの半導体材料で 太陽光エネルギー変換を可能にします

主な方法:

  • 原子力顕微鏡やインデントシステムを使用して,センター対称単一結晶の張力グラデーションを誘導する.
  • フレキシエレクトリック効果が太陽光発電の性質に及ぼす影響を調査する.
  • ストロンチウムチタネート,二酸化チタン,およびシリコンで生成された光電流を測定する.

主要な成果:

  • ストレスのグラデーションを通して中心対称性のある材料で重要な光電流を達成しました.
  • フレキソ光伏効果を証明した. ストレート・グラデーションによる大量光伏効果.
  • この効果は p-n 結合を必要とせずに機能していることが観察されました.

結論:

  • フレキシ光伏効果は,フレキシ電気効果を媒介することによって,任意の半導体で実現できます.
  • この発見により,高効率の太陽電池に使える材料の範囲が広がりました
  • 既存の半導体を使用した現在の太陽電池技術の強化の可能性