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Figure 10-44 Solar DC isolator switch.
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Figure 10-45 Watt hour meter.
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Figure 10-46 Awelamentawe school solar display. Image courtesy Dulas.
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Of course, if we have a solar array in a public area, it is also nice to promote solar technology to others, and our solar array is a powerful tool to educate others with. At this school in Wales, in Awelamentawe (Figure 10-46), a display is
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prominently mounted in the main reception, to show visitors, and help educate children about, how much energy the school s solar array is producing.
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Photochemical Solar Cells
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My sincerest thanks to Dr. Greg P. Smestad for the information and images he has provided, on which this chapter is based. In addition to the photovoltaic solar cells that we have seen earlier in this book, there are other ways of generating electricity directly from the sun. We saw how photovoltaic solar cells rely on the photovoltaic effect that occurs at semiconductor junctions, and how the semiconductor performs the two jobs of absorbing the light and separating electrons. One of the problems with this approach is that, because of the sensitive nature of the cells, they must be manufactured in ultra-clean conditions in order to be clean and free from defects which might impede their operation. This works effectively; however, it is expensive. The thing about photochemical solar cells is that they use cheap technology. Titanium dioxide is not some rare chemical that requires expensive processing, it is already produced in large quantities and used commonly; furthermore, you don t need an awful lot of it only around 10 g per square meter. When you figure that this 10 g only costs two cents, you begin to realize that this is a solar technology with a lot of promise for the future. In an attempt to make solar technology cheaper and more accessible, Michael Gr tzel and Brian O Regan from the Swiss Federal Institute of Technology decided to explore different approaches to the problem.
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The photochemical solar cell is sometimes also referred to as the Gr tzel cell after Michael Gr tzel who worked on developing the cell.
The photochemical solar cell has grown out of an expanding branch of technology biomimickry, looking at how we can mimic natural processes to make more advanced technologies. Rather than having a single thing to do all of the jobs, as in a conventional photovoltaic cell, photochemical solar cells mimic processes that occur in nature. Electron transfer is the foundation for all life in cells; it occurs in the mitochondria, the powerhouses of cells which convert nutrients into energy. Titanium dioxide, while not immediately springing to mind as a household name, is incorporated in a lot of the products that we use every day. In paints, as a pigment, it is known by its name titanium white. It is also used in products such as toothpaste and sunscreen. Titanium dioxide is great at absorbing ultraviolet light.
You might find titanium dioxide referred to as Titania in some references.
Copyright 2007 by The McGraw-Hill Companies, Inc. Click here for terms of use.
How do photochemical solar cells work
Take a peek at Figure 11-1, in the top image, we can see the energy transfers taking place the light striking our photochemical solar cell, generating energy and turning the shaft of the electric motor, which is connected to our cell. The radiated energy from the sun in the form of light, is being transformed through a chemical
process into electrical energy, which travels through the circuit to the motor, where electromagnets turn the electrical energy into movement (kinetic energy). We need to look at the cell in a little more depth to understand the chemical processes that are taking place in it in order to generate the electricity. The dye when it is excited by light injects an electron into the titanium dioxide with which the plates are coated and semiconducts.
Photochemical Solar Cells
Figure 11-1 How a photochemical solar cell works. Image courtesy Greg P. Smestad.
Project 29: Build a Photochemical Solar Cell
Project 29: Build Your Own Photochemical Solar Cell
Online resources
Point your browser toward www.solideas.com/solrcell/cellkit.html for more information on dye sensitized photochemical solar cells and where you can obtain a kit of the parts featured in this project.
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