Nowadays, most of us use equipments, machines and tools to reduce our loads and make us more convenient. They are used in the office, industry or at home. The more varieties of electronic and electrical products, the more demand of electricity.

There are many power sources to generate electricity such as water turbine generator, wind turbines, steam turbines generator, coal, oil, fossil fuel, natural gas and nuclear power. As mentioned above, more and more electricity is demanded whilst the power sources will be a lack of power in the near future. During the process of electricity production, wastes, toxic gases (Carbon dioxide, Carbon monoxide, Sulfur dioxide) or smokes may be generated. These are one of factors that cause air pollution, acid rain and global warming. Besides, the nuclear power is not safe for uses. As long as the power demand remains consistent, the renewable energy source must be replaced. Especially, it is clean and environmental friendly. The solar power is one of the solution and being studied by several researchers and research groups.

The major component for producing the solar energy is solar cell or the other term is PV. PV is an abbreviation for Photovoltaic that means voltage generated from light or sunlight. Solar cell is made up of two crystalline silicon wafers. The rear of the wafer is doping with the phosphorous to create the electrical charges, electrons. When sunlight strikes the exposed surface, electrons move toward the inner wafer, which is doping with the boron to create the electrical charges and holes. There are different in potential between two layers. To produce sufficient electricity, a number of cells are wired together to becomes a module and these modules are wired into large arrays. The principle work of solar power is the sunlight is converted into the electricity and be charges the batteries for any applications or other purposes.

There are multifarious advantages of solar power; example include it is the natural power, free, unlimited, clean and non-polluting, no moving parts being operation, minimal maintenance need and easy to use. Moreover, it can be applied to everywhere that sunlight is visible, the hill, the island, the sea or even in outer space.

At this time, solar cell can be used in various applications including calculators, watches, microwave repeater stations, lighthouses, traffic lights, street lightings, motor boats, airplanes, water pumping for irrigations and satellites, etc. In several countries, the solar power stations are widely used to provide electrical power. In Thailand, the solar power stations are constructed for rural electrifications. Additionally, several groups involved with the solar power join the cooperation and extensively publicize about the solar power. Also, research and develop the solar cell.

Although, today we can produce electricity from the sun, unlimited power resource, the power research and development team still continuously progress to optimize the resources.