Solar power as a clean energy field of the "leader" is currently the industry's concern. If you are interested, take a look at the composition of solar cells and related photovoltaic materials.
Solar power plants, often referred to as solar cells, Solar panel structures can directly convert solar energy into electricity. In solar panels, the photons released by the sun make the outer electrons of the semiconductor material separate from the bonds of the atoms. Solar panel structures When electrons are forced to move in the same direction, electric currents can be generated, powering electronic devices or transmitting electricity to the grid.
PV has been one of the subjects of scientific research since the first time that Alexandre Bequerel, the French physicist, has been theoretically theoretical in 1839. At present, with the United States, Japan and Europe's major research teams to accelerate the industrialization of their respective solar systems, Solar panel structures the international market for photovoltaic industry has continued to expand.
Although the composition of photovoltaic system is different, but all the components include several layers from the smooth to the back surface of the material. Solar panel structures Sunlight passes through the protective layer (usually glass) first, then through the transparent contact layer into the inside of the battery. At the center of the assembly is the absorbent material, which absorbs photons and completes the "Light current". Solar panel structures The semiconductor material depends on the specific PV system requirements.
Below the adsorbent layer material is the back metal layer that completes the circuit conduction. Composite film layer under the back metal layer, its role is to make photovoltaic modules waterproof insulation. Usually the back of the PV module adds an extra layer of protection, the protective material is glass, aluminum alloy or plastic.
Semiconductor materials in photovoltaic power systems can be silicon, Solar panel structures polycrystalline films or single crystal films. Silicon materials include monocrystalline silicon, polysilicon, and amorphous silica. Monocrystalline Silicon has a regular structure, Solar panel structures which is higher than the photoelectric conversion rate of polysilicon.
The silicon atom in amorphous silicon is randomly distributed and its photoelectric conversion rate is lower than that of monocrystalline silicon, but it can capture more photons than crystalline silicon, and it can be enhanced by adding germanium or carbon in amorphous silicon.
Copper-indium-Selenium (copper Indium Diselenis), Solar panel structures cadmium telluride (Cadmium Telluride) and thin film silicon are commonly used polycrystalline film materials, and the high photoelectric conversion rate of materials such as gallium arsenide (Gallium Arsenide) also usually contains monocrystalline silicon thin film materials. These materials are used for specific photovoltaic power generation fields because of their unique properties. These characteristics include: Crystallinity, band gap size, Solar panel structures absorption performance and processing difficulty.
The order of the atoms in the crystal structure determines the crystallinity of the semiconductor material, and the charge transmission, current density and energy conversion efficiency of the solar cell are affected by the crystallinity. The bandgap of a semiconductor material is the minimum energy required to transition electrons from a binding state to a free State (that is, to allow electron conduction). The band gap size is usually expressed as eg, which describes the energy difference between the valence band and the conduction band. Solar panel structures The valence band of semiconductor material is low energy level, and the conduction band is high energy level. The absorption coefficient is used to characterize the distance of a photon penetrating medium at a particular wavelength, which determines the ability of the photon to be absorbed by the medium. The absorption coefficients are determined by the cell material and the wavelength of the absorbed photon.
The cost and ease of processing of various semiconductor materials and devices depend on a variety of factors, including the type and scale of materials used, the production cycle, and the migration characteristics of the battery in the sedimentary chamber. Each factor will play an important role in the specific PV demand.