Solar Cell Construction
A Look At the Interior Workings of a Solar Cell

Having a good understanding of solar cell construction and of the fundamentals of photovoltaic energy can help you find out if the use of this renewable energy source is for you. People have been using solar power in their homes in a variety of ways for over a hundred years, and with the looming costs of conventional power sources, its time to get a better idea of how solar power works and what it can do for you!

The first thing that we must take a look at are the solar cells themselves. Solar cells are made out of materials which can conduct electricity when they are supplied with light and heat. During times of low temperature, they will operate as insulators. These materials are called semiconductors, and most of the solar cells that are found are made out of the semiconductor element silicon. Through the introduction of certain chemical elements, semiconductors can be used to create a surplus of positive or negative charge carriers. Two differently-charged layers of semiconductors are combined to form a p-n junction where the layers meet.

At the p-n junction, an electric field is built up which results in the separation of charge carrier. When the energy knocks the electrons loose, a current is created and when metal contacts are utilized, a electric charge can be tapped and used externally. This leads to the creation of solar power, which can be used to heat water and power appliances in the home. Solar cells that draw power in this way are known as photovoltaic.

One of the important things that solar energy enthusiasts are always trying to correct is how much energy is lost when the light is reflected off of the surface of the cell. The more light that is bounced off, the more energy and power is wasted. Grätzel cells, for instance, use titanium dioxide to manage the loss of power and dye to improve light absorption. Similarly, concentrator cells rely on the use of a mirror and lens to create a higher light intensity.

As the name implies, solar cells are reliant on solar power. When you are thinking about whether or not put solar panels on your house, think about the temperature and the amount of sunlight that you can expect to get. Houses that are completely on solar power will usually have some form of generator backup. These are all important things to be aware of when you are thinking of switching over to a renewable energy source.