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== Understanding the market ==
Currently the market for solar cells depends on the manufacturing cost, module efficiency cost, and the cost of electricity being the biggest factor for solar cells. The average manufacturing cost for crystalline silicon (1 generation solar cell) is $2.70/Wp, a module efficiency from 12 to 19%, and it average selling price is $3.80Wp. The second generation thin film solar cell, such as CdTe's manufacturing cost is $0.98/Wp and a 10% module efficiency<ref>Hillhouse 250 </ref>. The third generation solar cells (CdSe Quantum Dots) are still in the lab phase, but are suppose to cost less to manufacture, with a higher module efficiency, and sell at a lower price. The first and second generation solar cells have a maximum theoretical conversion efficiency of 31%, whereas the thurd generation's maximum theoretical conversion efficiency is 66%, which is more than double the effciency <ref>Etgar </ref>. When the third generation solar cells like CdSe Quantum Dots Heterojunction solar cells start to be manufactured, they will surpass their predecessors (1st and 2nd generation solar cells) and be the desired solar cells on the market.
The solar powered purification tank can be in the market for purifying contaminated drinking water and remove salt from salt water. There is a big demand for clean water in the world. Approximately 740 million people don't have a clean water source available <ref>UNICEF (2012) </ref> and approximately 3.4 million people die each year from contaminated water, sanitation, and hygiene problems <ref>Pruss-Ustun (2008) </ref>. Being able to have cheap available clean water can help reduce the amount of deaths and raise the standard of living for people who don't have access to clean water. If the solar powered purification tank can be made to be affordable for people in the regions of the world that don't have clean water, then human standard of living on Earth can be raised.
== Advantages of Quantum Dots Over Current Solar cells ==


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