Difference between revisions of "Lead Sulfide Quantum Dot Synthesis"
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=== Overview === | === Overview === | ||
[[Image:CdSeqdots.jpg|thumb|400px|Cadmium selenium Quantum Dots (QDs) are metal nanoparticles that fluoresce in a variety of colors determined by their size. QDs are solid state structures made of semiconductors or metals that confine a countable, small number of electrons into a small space. ]] | [[Image:CdSeqdots.jpg|thumb|400px|Cadmium selenium Quantum Dots (QDs) are metal nanoparticles that fluoresce in a variety of colors determined by their size. QDs are solid state structures made of semiconductors or metals that confine a countable, small number of electrons into a small space. ]] | ||
Quantum dots are semiconductor | Quantum dots are semiconductor nanocrystals on the scale of a few nanometers, or several hundred atoms. At this size quantum effects dominate and the electrons are quantum confined to narrow energy levels determined by the size of the particle. This means that the absorption wavelength the light can be fine-tuned and that quantum dots can be used to adjust the bandgap of the materials they are associated with. Quantum dots being explored for use in photovoltaics and in signal processing. | ||
=== Significance === | === Significance === | ||
Revision as of 08:03, 9 August 2011
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Overview
Quantum dots are semiconductor nanocrystals on the scale of a few nanometers, or several hundred atoms. At this size quantum effects dominate and the electrons are quantum confined to narrow energy levels determined by the size of the particle. This means that the absorption wavelength the light can be fine-tuned and that quantum dots can be used to adjust the bandgap of the materials they are associated with. Quantum dots being explored for use in photovoltaics and in signal processing.
Significance
Quantum dots can be used increase the efficiency of solar cells by tapping different portions of the spectrum and by increasing the number of excitons that be formed per photon, resulting in higher quantum efficiency.