Solar energy refers to solar radiation energy. Since the formation of the earth, organism mainly light and heat, provided by the sun to survive, and as a method of food preservation, such as salt and salted fish. But nowadays, the application of solar energy gathered more attention. In recent years, people pay more attention to it not because of its characteristics of the inexhaustible, but also because of characteristics of no pollution to the environment. It is called the “green energy”.
As long as to be irradiated, voltage and current will come out instantaneously from the photoelectric semiconductor wafer itself. The next I will introduce some kinds of solar cells and describe how they do work based on the different types of solar cells and find out the differences and similarities among them. According to the working principle of solar cells, solar cells can be divided into single crystal silicon solar cell, polycrystalline silicon solar cell and thin film solar cells.
The earliest kind of solar cells is the single crystal silicon solar cell. Silicon is a kind of elements which is very abundant on earth, it exists almost everywhere and it is also inexhaustible for solar cell manufacturing. But it is not easy to refine the single crystal silicon. But with the progress of science and technology, people could produce the polycrystalline silicon solar cells and amorphous silicon solar cells. But no matter how advanced the technology is, nowadays the production of solar cells also cannot do without silicon. But in addition, except silicon, people could produce solar cells with cadmium sulfide, gallium arsenide, copper indium selenium and many other substances, but it cannot achieve mass production.
Single crystal silicon solar cell is a kind of solar cells which develops faster currently, and its production process has been prefect. Nowadays the single crystal silicon has been widely used in earth and even the outer space. This kind of solar cells requires high purity of silicon, almost close to 99.999%.
The appearance of polycrystalline silicon solar cells is to save costs. The production process of polycrystalline silicon is similar to the production process of single crystal, but the photoelectric silicon conversion efficiency is about 12%, lower than the single crystal silicon solar cell, but one flaw cannot obscure the splendor of the jade, the production process of material of polycrystalline silicon is more convenient, and to produce polycrystalline could save much more money.
Thin film solar cell is more close to our daily life. Thin film solar cells can be produce with the low price materials, such as glass, plastics, ceramics, graphite, metal strips and other different materials. And what makes us exciting is the thickness of thin film solar cell which is only a few nanometers. Experts believe that, within the next 5 years, thin film solar cells will be widely used in our watches, calculators even clothing.
Solar cell is not only our future, but also our descendants’ future!