Sunlight Into Electricity – The Magic Photovoltaic Cell
Solar power, the subject of so much discussion over the last 20 years is becoming more and more important as many countries try to find a cure for the dependence on fossil fuels. When the uninformed think about solar power they may tend to be reminded about the legend of alchemy, the ancient legend of turning lead into gold. It is easy to visualize the heat from the sun, everyone has been sunburned at least once. But how does the power of the sun turn on electric lights?
No not magic or alchemy. What makes this potential unlimited power source possible is the photovoltaic cell. You have certainly seen them. They are everywhere. A few years ago they appeared as unsightly blue topped boxes on a number of homes. If you own a calculator or radio or any kind of battery free small appliance, chances are your device has at least one photovoltiac cell somewhere on it’s exterior surface. They appear as a shiny blue window.
The heart and soul of a photovoltaic cell is a very thin semiconductor sandwich made with a multiple layers of highly purified silicon. Semiconductors are actually crystals designed to yield the properties necessary for use in electrical circuits. Transistors and microprocessors the things that power your computers and other electronic gadgets are made up of semiconductors.
The magic of sunlight to electricity occurs when sunlight strikes these cells if they connected to an electrical circuit. A sufficient number of these cells are arrayed to provide enough power for the job they are designed to do. As more money is invested in development of these cells they become more efficient. Over time the cost of manufacturing decreases. With more demand the manufacturing process becomes more efficient and the cells less expensive.
Governments at many levels are encouraging the use of these systems to provide the electrical power for home and office in an effort to remove more demand from the existing power grid. As grant money and tax deductions become more available this technology will become less and less expensive and solar power surely will play a major role in the much debated clean, green power sources of the near future.

