Tuesday 27 October 2009

Solar Battery Chargers for Small Electronics

By Lewis Johnson

Solar battery charger is one of these devices that became necessary once we have all these electric devices that we use on a daily basis. The most wonderful thing about using a solar battery charger is that you don't have to pay anything for using the solar energy unlike the huge bills that you have to pay when you use the electric charger.

Thin-film solar cells are made of semiconductor layers measuring just a few microns thick. This enables their integration in functional and decorative building elements such as roof shingles and roofing tiles, as well as entire facades of buildings, glass domes, and air wells.

Solar cells are made from two layers of silicon. One layer has had impurity atoms such as aluminum, which is to the left of silicon in the periodic table and which has one fewer valence electron than silicon. Because solar cells are semiconductor devices, they share many of the same processing and manufacturing techniques as other semiconductor devices such as computer and memory chips.

Multifunction solar cells are credited with helping scientists gather much more data than expected on Mars by dramatically extending the extraterrestrial lifetimes of the Spirit and Opportunity space rovers. But they were initially designed for earthbound applications. The most common types of solar cells are based on the photovoltaic effect, which occurs when light falling on a two-layer semiconductor material produces a potential difference, or voltage, between the two layers.

So solar cells are made not just of silicon, but silicon/phosphorous layer and a silicon/boron layer. When these two layers are sandwiched together, the free electrons of one layer all rush to fill the empty electron spaces of the other. Solar cells are near and dear to the hearts of BEAM errs since they convert sunlight (or more accurately, any available ambient light) into electricity.

The active layer of silicon nanocrystals dispersed in the conducting P3HT polymer is spin-cast from solution and topped with an aluminum electrode. Silicon solar cells are solar cells which are coated with silicon, and are the most common type used. These cells are connected in series called modules, and the modules are interconnected to form an array that produces the desired voltage.

In the mechanical stack approach, two individual solar cells are made independently, one with a high band gap and one with a lower band gap. Then the two cells are mechanically stacked, one on top of the other. Solar cells are made of the same kinds of semiconductor materials, such as silicon, used in the microelectronics industry. For solar cells, a thin semiconductor wafer is specially treated to form an electric field, positive on one side and negative on the other. Current silicon based solar cells are only about 20 per cent efficient and cost about $3 per watt of electricity generated. A newer form of solar powered cells being developed is plastic not silicon based.

It is best to simply assume that the solar battery charger is not waterproof. The solar battery charger is becoming more and more an essential item. A solar battery charger is one of the more useful types of chargers and can be used at pretty much any time of the day. Click on the link below for more information.

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