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Cadmium sulfide quantum dots on cells. There are colloidal methods to produce many different semiconductors. Typical dots are made of binary compounds such as lead sulfide, lead selenide, cadmium selenide, cadmium sulfide, cadmium telluride, indium arsenide, and indium phosphide. Dots may also be made from ternary compounds such as cadmium ...
Cadmium sulfide is the inorganic compound with the formula CdS. Cadmium sulfide is a yellow salt. [4] It occurs in nature with two different crystal structures as the rare minerals greenockite and hawleyite, but is more prevalent as an impurity substituent in the similarly structured zinc ores sphalerite and wurtzite, which are the major economic sources of cadmium.
Quantum confinement effects in quantum dots can also result in fluorescence intermittency, called "blinking." [14] CdSe quantum dots have been implemented in a wide range of applications including solar cells, [15] light emitting diodes, [16] and biofluorescent tagging. CdSe-based materials also have potential uses in biomedical imaging. Human ...
Cadmium selenide: CdSe: 1.74 [6] direct: Nanoparticles used as quantum dots. Intrinsic n-type, difficult to dope p-type, but can be p-type doped with nitrogen. Possible use in optoelectronics. Tested for high-efficiency solar cells. II-VI: 2: Cadmium sulfide: CdS: 2.42 [6] direct: Used in photoresistors and solar cells; CdS/Cu 2 S was the first ...
Brus is a foundational figure in the research and development of quantum dots. Quantum dots are tiny semiconducting crystals whose nanoscale size gives them unique optical and electronic properties. [5] Brus was independently the first to synthesize them in a solution in 1982.
A quantum dot solar cell (QDSC) is a solar cell design that uses quantum dots as the captivating photovoltaic material. It attempts to replace bulk materials such as silicon , copper indium gallium selenide ( CIGS ) or cadmium telluride ( CdTe ).
Quantum dots are popular alternatives to organic dyes as fluorescent labels for biological imaging and sensing due to their small size, tuneable emission, and photostability. The luminescent properties of quantum dots arise from exciton decay (recombination of electron hole pairs) which can proceed through a radiative or nonradiative pathway.
Additionally, the synthesis and processing of quantum dots often involve toxic materials such as lead and cadmium, raising environmental concerns. [34] Ongoing research is focused on developing environmentally friendly quantum dots based on lead-free materials and improving quantum dot film processing to enhance stability and efficiency. [75]
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