Resonant Tunning Through Quantum Dot Array

1.10.1    photovoltaic device Quantum dots may be able to increase the efficiency and reduced the cost of today’s typical silicon photovoltaic cells. According to an experiment proof from 2006 (controversial results,), quantum dots of lead selenide can produce as many as seen excitons from one high energy photon of sunlight (7.8 time the band gap energy). This compares favourable to today’s photovoltaic cells which can only manage one exciton per high-energy photon, with high kinetic energy carriers losing their energy as hest. This would not result in a 7-fold increase in final output however , but could boost the maximum theoretically efficiency from 31% to 42%.
Quantum dot photovoltaic would theoretically be cheaper to manufacture, as they can be made using simple chemical reactions. The generation of more than one exciton by a single photon is called multiple excitons generation (MEG) or carrier multiplication.
1.10.2    light emitting device there are several inquiries into using quantum dots as light-emitting diodes to make displays and other light sources, such as QD-LED displays, and QDWLED” (White LED). In June, 2006, QD Vision announced technical success in making a proof-of-concept quantum dot display and shows a bright emission in the visible and near infra-red region of the spectrum. Quantum dots are value for displays, because they emit light in very specific Gaussian distributions. This can result in a display that more accurately renders the colors that are not color that the human eye can perceive. Quantum dots also require very little power since they are not color filtered. Additionally, since the discovery of ‘’white-light emitting’’ QD, general solid-state lighting applications appear closer than ever. A color liquid crystal display (LCD), for example, is usually powered by a single fluorescent lamp (or occasionally, conventional white LEDs) that is color filtered to produce red, green, and blue pixels. Displays that intrinsically produce monochromatic light can be more efficient, since more of the light produced reaches the eye.
1.103 . Photo-detector devices
Quantum dot photo-detectors (QDPs) can be fabricated either via solution-processing or from conventional single-crystalline semiconductors. Conventional single-crystalline semiconductor QDOs are precluded from integration with flexible organic electronics due to the incompatibility of their growth conditions with the process windows required by organic semiconductors. On the other hand, solution-processed QDPs can be readily integrated with an almost infinite variety of substrates, and also post processed atop other integrated circuit such colloidal QDPs have potential applications in surveillance, machine vision, industrial inspection, spectroscopy, and fluorescent biomedical imaging.