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相关概念视频

Photoelectric Effect02:26

Photoelectric Effect

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...
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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
Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...
Biasing of P-N Junction01:16

Biasing of P-N Junction

The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
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...

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相关实验视频

Updated: May 22, 2026

Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light
11:26

Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light

Published on: September 12, 2014

通过潜在编程分子整流器增强光电效应.

Takane Imaoka1, Hiroaki Ueda, Kimihisa Yamamoto

  • 1Chemical Resources Laboratory, Tokyo Institute of Technology, Yokohama, Japan.

Journal of the American Chemical Society
|May 10, 2012
PubMed
概括

基于丹德里默的电子整流器显著提高了在使用紫光敏剂的设备中的光电流. 这种增强源于树突性甲结构,促进了高效的电子转移,与其他捐赠者不同.

科学领域:

  • 材料科学 材料科学 材料科学
  • 有机电子 有机电子
  • 光导电性 光导电性

背景情况:

  • 电子整流器对于有机电子设备中有效的电荷传输至关重要.
  • 体提供独特的纳米级架构来控制分子相互作用和电荷转移.
  • 光敏剂在光导系统中将光能转化为电信号方面发挥着关键作用.

研究的目的:

  • 为了研究基于树突分子的电子整流器对光导装置的光电流响应的影响.
  • 评估树突基胺 (DPA) 架构在调解电子转移中的作用.
  • 为了比较嵌入树突体的色素与非树突体对应物的性能.

主要方法:

  • 制造含有基于树突分子的电子整流器的光导装置.
  • 在树突性甲基 (DPA) 架构中将甲作为光敏感剂的整合.
  • 测量和比较光电流响应使用树突基和非树突基系统.
  • 使用密度函数理论 (DFT) 来预测电子传输路径的计算分析.

主要成果:

  • 通过嵌入DPA树突体中的色素观察到光电响应的显著增强 (增加20倍).
  • 基于树突分子的色素敏感剂的性能优于其非树突分子类型的类似物.

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Optical Control of Living Cells Electrical Activity by Conjugated Polymers

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Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light
11:26

Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light

Published on: September 12, 2014

Optical Control of Living Cells Electrical Activity by Conjugated Polymers
10:16

Optical Control of Living Cells Electrical Activity by Conjugated Polymers

Published on: January 28, 2016

An In-House-Built and Light-Emitting-Diode-Based Photodynamic Therapy Device for Enhancing Verteporfin Cytotoxicity in a 2D Cell Culture Model
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An In-House-Built and Light-Emitting-Diode-Based Photodynamic Therapy Device for Enhancing Verteporfin Cytotoxicity in a 2D Cell Culture Model

Published on: January 13, 2023

  • 相反,使用聚乙烯) 作为与树状粒体一起的电子供体,导致反应减少,表明了特定的供体-受体相互作用.

    • 结论:

    • 树突性甲 (DPA) 架构有效地增强光电产生,当与合适的光敏感剂如色氨酸相结合时.
    • DPA结构促进了从核心向外围沿着潜在梯度的定向电子转移.
    • 这些发现突出了定制树突结构在先进光导装置中优化电荷传输的潜力.