The sun is a natural source of energy. The earth every living creature has the ability to play the role of reason, even for its survival, are directly or indirectly due to the energy from the sun. Our planet is located almost 100 million miles from the sun. The radiant energy it intercepts is incredibly small (about three-tenths of a millionth). Such a small amount of energy is actually 100,000 times greater than the current world-wide power generation capacity. At present, the world, especially the industrialized countries, are starting to feel a shortage of energy. Therefore, people are turning to solar energy to solve the energy crisis.
Solar energy is available unlimitedly every day, and it is huge. If used in large power plants, the greenhouse effect is reduced. Some energy experts and environmental protection experts believe that the thermal impact of solar energy is much smaller than that of any other alternative in terms of meeting human energy needs in the future. As a new energy source that does not pollute the environment and is inexhaustible, it is everywhere. Especially in terms of power supply, some experts believe that solar power will eventually account for 20
Solar energy is a radiant energy, solar power means --- To convert sunlight directly into electricity, it must be by means of an energy converter to convert into electricity. The process of directly converting light energy into electrical energy should be called the photovoltaic effect. Without the use of any other mechanical components, the energy in the light is obtained by the electrons of the semiconductor device, so that electrical energy is generated. This energy converter that converts light energy into electrical energy is a solar cell. Solar cells, like transistors, consist of semiconductors. Its main material is silicon, but also some other alloys. The high-purity silicon used in the manufacture of solar cells is subjected to a special purification process. As long as the solar cell is exposed to sunlight or light, it can convert light energy into electricity, so that the current flows from one side to the other, and generally can emit 10 to 20% of the power of the received light energy. In general, the stronger the light, the more power is generated. In order to minimize the reflection of light by the solar panel, the light energy is converted into electrical energy, and generally it is covered with a film that can prevent reflection of light, so that the surface of the solar panel is purple. The basis of its working principle is the photovoltaic effect of the semiconductor PN junction. The so-called photovoltaic effect is the effect of the change in the charge distribution within the object when the object is exposed to light, resulting in electromotive force and current. When sunlight or other light strikes the semiconductor's PN junction, a voltage (called photo-generated voltage) appears on both sides of the PN junction. This phenomenon is known as the photovoltaic effect. Short circuiting the PN junction generates current.
The main advantage of solar power generation is that: solar cells can be installed in the roof and other unused space, no noise, long life, and almost no need to adjust once set. As long as the roof is filled with solar cells, self-sufficiency in electricity at home can be achieved. The main use of solar energy today is no longer a small-scale one. It is professional in nature. It has played a major role in the field of military affairs, communications, and urban construction. Venezuela also introduced cheap solar cars and European scientists to develop lightweight solar batteries that can be worn on the body. At present, there is a huge space for the development of solar energy and related technologies may achieve breakthroughs in a short period of time. It has been used by many developed countries as an important part of its energy strategy.