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First of all, let s cover a little bit of the theory. Ordinary silicon forms into a regular crystalline structure. If you look at Figure 10-3, you can see the way that the silicon atoms align themselves into a regular array. To make silicon semiconducting, we can take a little bit of another chemical, in this case boron, and
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Cell material Monocrystalline silicon Polycrystalline silicon Thin-film copper indium diselenide (CIS) Cadmium telluride Amorphous silicon
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Figure 10-3 Plain old silicon its atomic structure. Figure 10-5 Silicon doped with phosphorus note the spare electron.
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introduce it to the silicon. Where there is a boron atom, there is also a missing electron. This creates a hole in the outer shell of the boron atoms and its neighboring silicon atom (Figure 10-4). If we add a little bit of phosphorus to our silicon, we get the opposite effect, a spare electron (Figure 10-5), which doesn t quite know where to fit in. As a result, it sort of lingers uncomfortably waiting for something to happen. Now, we can use these two types of doped silicon to make semiconducting devices, in this case photovoltaic cells.
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A photovoltaic solar cell is a bit like a sandwich. It is made from layers of different types of silicon, as illustrated in Figure 10-6. Starting from the base, we have a large contact. Then on top of this we have a layer of p-type silicon, a junction called the space charge region
Solar Photovoltaics
Figure 10-4 Silicon doped with boron note the missing electron.
Figure 10-6 Cutaway solar cell.
where the magic occurs, and a slice of n-type silicon on top. On top of all this is layered a grid electrode, which does the job of making the other contact. Now, photons from the sun hit our solar cell, and in doing so spare negatively charged electrons,
are knocked across the boundary between p- and n-silicon, which causes a flow of electrons around the circuit. We are now going to look at how the silicon for these solar cells is manufactured, using some things you can do at home.
Project 20: Grow Your Own Silicon Crystals
Project 20: Grow Your Own Silicon Crystals
that we are not going to run out of silicon in a hurry! The problem with sand is that it also contains oxygen in the form of silicon dioxide, which must be removed. The industrial process used to produce silicon requires temperatures of around 3270 F (which is about 1800 C). Obviously we can t experiment with these sorts of temperatures at home but we can recreate the process! If you don t want to get the individual bits and bobs, a couple of educational scientific vendors sell rock-growing kits. These links are to suppliers of kits of parts:
You will need
Plastic coffee jar (empty) Skewer Hardboiled egg Sugar Food coloring
Tools
Compass Egg slicer
To make a photovoltaic cell we need silicon, this project is going to show you how solar cells are produced from crystalline silicon. The words crystalline silicon should indicate to you that this type of solar cell is made from crystals of silicon. We saw earlier how silicon aligns itself into a regular crystalline array, now we are going to look at growing this crystal. In industry, silicon crystals are grown to form a uniform cylinder of silicon which is used as the base material for crystalline solar cells. There is plenty of silicon about on the earth, in fact, as mentioned previously, after oxygen it is the second most abundant element. When you think that sand and quartz all contain silicon and then imagine the amount of sand in the world, you begin to realize
scientificsonline.com/product.asp pn=3039234& bhcd2=1151614245 www.sciencekit.com/category.asp_Q_c_E_737919 www.scienceartandmore.com/browseproducts/ Rock-Candy-Growing-Experiment-kit.html
If you want to do it all yourself, then you can see from Figure 10-7 that the process is a relatively easy one! You are going to need a saturated sugar solution, this will sit in the lid of your coffee jar. Now, take a large crystal of sugar, often sold as rock sugar and glue it to the end of the skewer. Next, drill a hole the same diameter as the skewer, and poke the skewer through the bottom of the coffee jar. Stand it on a windowsill and lower the crystal into the saturated sugar solution. Over some
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