Solar power as the field of clean energy "leader" is currently the industry's attention. Solar panel structures If you are interested in this, take you to understand the composition of solar cells and related photovoltaic materials.
A solar power plant, commonly referred to as a solar cell, Solar panel structures can convert solar energy directly into electrical energy. In solar panels, the sun's released photons make the outer electrons of the semiconductor material detached from the bond. When the electrons are forced to move in the same direction, they can generate electricity, supply power to the electronic equipment, Solar panel structures or deliver electricity to the grid.
Since the French physicist Alexandre-Edmond Bequerel in 1839 for the first time the photovoltaic power generation technology theory so far, photovoltaic power generation has been one of the themes of scientific research. Solar panel structures At present, with the United States, Japan and Europe, the main research team to accelerate the industrialization of their respective solar energy systems, Solar panel structures photovoltaic industry, the international market continues to expand.
Although the composition of the photovoltaic power generation system is different, but all the components include several layers from the smooth to the back surface of the material. The sun first passes through the protective layer (usually glass) and then enters the interior of the battery through the transparent contact layer. In the center of the component is the adsorption material, Solar panel structures this layer of material absorbs photons, and then complete the "photogenerated current." And the semiconductor material therein depends on the specific requirements of the photovoltaic system.
Below the adsorbent layer material is the back metal layer that completes the circuit conduction. Composite film layer in the back metal layer below, its role is to make the PV module waterproof adiabatic. Solar panel structures Usually the back of the PV module will add an additional protective layer, the protective layer of materials for the glass, aluminum or plastic.
The order of the atomic arrangement in the crystal structure determines the crystallinity of the semiconductor material, and the charge transfer, Solar panel structures 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 restrained state to a free state (i.e., to allow electron conduction). The bandgap size is usually expressed in Eg, which describes the energy difference between the valence band and the conduction band. The valence of the semiconductor material is a low energy level and the conduction band is a high energy level. Solar panel structures 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. Solar panel structures The absorption coefficient is determined by the wavelength of the cell material and the absorbed photon.
The cost and ease of processing of various semiconductor materials and devices depend on a variety of factors including the type of material and the scale of use, the production cycle, Solar panel structures and the migration characteristics of the battery in the deposition chamber. In the specific needs of photovoltaic power generation, each factor will play an important role.