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Related Concept Videos

Quantum Numbers02:43

Quantum Numbers

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It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
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The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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Hormones—or any molecule that binds to a receptor, known as a ligand—that are lipid-insoluble (water-soluble) are not able to diffuse across the cell membrane. In order to be able to affect a cell without entering it, these hormones bind to receptors on the cell membrane. When a first messenger, a hormone, binds to a receptor, a signal cascade is set off, causing second messengers, proteins inside the cell, to become activated, resulting in downstream effects.
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The Dot Product01:26

The Dot Product

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Measuring how one directional quantity affects another along a specific path involves comparing their orientation and strength. When two such quantities are represented using direction and amount, a numerical result is computed to show how much one acts along the path of the other. This result comes from a rule combining both inputs' horizontal and vertical parts and adding the results.This calculation gives a single value that grows larger when both inputs point in similar directions and...
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Dot Product01:29

Dot Product

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The dot product is an essential concept in mathematics and physics.
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Dot Product: Problem Solving01:21

Dot Product: Problem Solving

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The dot product is a powerful tool in problem-solving involving vectors, given that the dot product of two vectors is the product of their magnitudes and the cosine of the angle between them measured anti-clockwise. Solving problems involving the dot product requires understanding its properties and developing a step-by-step process to solve them. Here are the main steps to follow when solving any general problem involving the dot product:
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Production and Targeting of Monovalent Quantum Dots
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Surface States in Ternary CdSSe Quantum Dot Solar Cells.

Zhenhua Chen, Hui Li, Xiangzhi Zhang

    Journal of Nanoscience and Nanotechnology
    |April 24, 2018
    PubMed
    Summary

    Annealing ternary cadmium sulfide selenide (CdSSe) quantum dot solar cells removes surface oxygen, improving charge transport and boosting efficiency to 4.72%. This addresses key limitations in quantum dot-sensitized solar cell performance.

    Keywords:
    Surface StatesTernaryQuantum DotSolar CellSynchrotron

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    Area of Science:

    • Materials Science
    • Renewable Energy
    • Nanotechnology

    Background:

    • Ternary CdSSe quantum dots (QDs) offer wide absorption and tunable band structures for solar cells.
    • Surface oxygen on CdSSe QDs creates band bending at the TiO₂ interface, hindering charge transport in QDSCs.

    Purpose of the Study:

    • To investigate the effect of annealing on oxygen additives and interfacial band bending in TiO₂/CdSSe QDSCs.
    • To improve the performance of ternary CdSSe QDSCs by optimizing annealing conditions.

    Main Methods:

    • X-ray photoelectron spectroscopy (XPS) and X-ray Absorption Near-Edge Structure (XANES) analysis to identify surface oxygen and band bending.
    • Annealing of TiO₂/CdSSe QD photoanodes under Argon atmosphere at various temperatures.
    • TiCl₄ treatment and MgO coating of TiO₂ nanocrystals.

    Main Results:

    • Annealing effectively eliminated oxygen additives and reduced interfacial band bending.
    • Short-circuit current (Jsc) significantly improved in annealed QDSCs.
    • TiCl₄ treatment and MgO coating, combined with annealing, compensated for voltage (Voc) and fill factor (FF) losses.

    Conclusions:

    • Optimized annealing conditions are crucial for enhancing charge transport in CdSSe QDSCs.
    • Surface passivation strategies combined with annealing can improve overall solar cell efficiency.
    • Achieved a maximum efficiency of 4.72% for ternary CdSSe QDSCs.