UV-vis absorption spectra of Group 12-16 semiconductor nanoparticles Cadmium selenide
Cadmium selenide (CdSe) is one of the most popular Group 12-16 semiconductors. This is mainly because the band gap (712 nm or 1.74 eV) energy of CdSe. Thus, the nanoparticles of CdSe can be engineered to have a range of band gaps throughout the visible range, corresponding to the major part of the energy that comes from the solar spectrum. This property of CdSe along with its fluorescing properties is used in a variety of applications such as solar cells and light emitting diodes. Though cadmium and selenium are known carcinogens, the harmful biological effects of CdSe can be overcome by coating the CdSe with a layer of zinc sulfide. Thus CdSe, can also be used as bio-markers, drug-delivery agents, paints and other applications.
I read this as saying by adding a coating of Zinc Sulfide, the toxicity is neutralized. This then enables their use for medical delivery innovations as well as other uses having a concern about toxicity.
This also excites me for waste heat recovery, Photovoltaic cells that respond to infrared – ‘thermovoltaics’ - can even capture radiation from a fuel-fire emitter; and co-generation of electricity and heat are said to be quiet, reliable, clean and efficient. A 1 cm2 silicon cell in direct sunlight will generate about 0.01W, but an efficient infrared photovoltaic cell of equal size can produce theoretically 1W in a fuel-fired system.
Once they get up and running the potential applications they can pursue or get involved with almost seem limitless, which means an income stream of mega proportions.
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