New Technology and New Varieties of Photovoltaic Cells
Author: Source: Datetime: 2016-10-04 11:42:08
So far, this chapter has briefly explained the basic principle of the solar power batteries with monocrystalline silicon semiconductor as an example. Monocrystalline silicon cells using silicon single crystal material, the photovoltaic effect is the use of ordinary PN junction. In order to apply photovoltaic cells to different environments (such as space) is required for photovoltaic cells with different performance indicators and technical characteristics, the formation of different new products and series. At the same time on the existing products also need in the performance 1: [such as conversion efficiency) replacement. So the photovoltaic cell technology is still a fast-growing high-tech fields. In addition to monocrystalline silicon photovoltaic cells, there are many varieties of photovoltaic cells, new varieties are also constantly born. In terms of battery materials, in addition to silicon material, there are a variety of other semiconductor and organic materials can be used for the production of photovoltaic cells. Even the use of silicon materials, there are monocrystalline silicon, polycrystalline silicon and amorphous silicon cells of the points. In the battery structure can also be used, including the new structure called the junction, including a variety of special designs, the performance of photovoltaic cells produce special effects.
The closer the photon energy is to the bandgap, the more efficient it is to absorb the energy, and one way to absorb more photons in the sun is to add multiple junctions with different bandgaps. A relatively large bandgap is placed on the upper surface of the solar power batteries for solar powered portable generator, and high energy photons are absorbed more efficiently on this layer. While the lower bandgap or even smaller junctions will be more effective in absorbing low-energy photons.
This phenomenon can be overcome by using so-called heterojunctions. The heterojunction is a composite junction composed of two materials which are closely matched by a crystal lattice. The band gap of the material near the surface of the cell is larger than the band gap near the bonded portion. The high band gap surface portion is transparent to the low energy photon solar powered portable generator, The photons then penetrate to the lower bandgap region and generate electron-hole pairs there, which can be collected prior to recombination. A heterojunction of indium tin oxide - silicon photovoltaic cells, copper sulfide - cadmium sulfide photovoltaic cells. If the lattice structure of two heterogeneous materials is similar, the lattice matching at the interface is better, it is called heterogeneous surface photovoltaic cell. Such as aluminum gallium arsenide gallium arsenide heterojunction solar power batteries.
Metal and semiconductor contact to form a "Schottky barrier" of the solar power batteries for solar powered portable generator, also known as the elbow 8 p hotovoltaic cells. The principle is based on the metal - semiconductor contact under certain conditions can produce rectified contact Schottky effect. At present, the so-called metal-oxide-semiconductor photovoltaic cells, namely, 10 ^ 5 photovoltaic cells; metal-insulator-semiconductor photovoltaic cells, that thief 13 photovoltaic cells. Such as cobalt - silicon Schottky photovoltaic cells, aluminum - silicon Schottky solar power batteries. TAG: Nuon German Category Separate Telangana MW 10 Used Tax Guarantee Powertrain Automotive Experiment Research Deployment
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