How to convert solar energy into electricity?
According to the theory of the formation of the solar system, the sun radiates a huge amount of thermal energy to the spaceObtained from solar power sun through photovoltaic cells transform to achieve. It with other power generation principle of the past entirely different, has the following features: no danger of depletion; the absolute clean (pollution-free); the distribution of resources without geographical restrictions; the nearest department in electricity generation; the energy of high quality; 6 users emotionally receptive 7 access; energy to spend a short time. The shortcomings are: the illuminate of energy distribution density is small, which was to occupy a huge area; the energy obtained with the four seasons, day and night and the clear one such as meteorological conditions. But in general, xiabuyanyu, as a new energy solar energy. Has great advantages, so attention around the world.To make solar power to achieve practical level, one is to improve the efficiency of solar photovoltaic conversion and reduce its cost, and the two is to achieve solar power grid connected with the presentAt present, the main solar silicon, polycrystalline silicon, amorphous silicon three. The highest conversion efficiency of monocrystalline silicon solar cell, has reached more than 20%, but the lowest price is the most expensive. The amorphous silicon solar cell conversion efficiency, but the price is the cheapest, most hope in the future for the general power will be the battery once it. A large area of photoelectric transformation efficiency reached 10% components per watt of power generation equipment, the price down to 1 $2, then with enough power now competition. At the end of this century will be estimated to reach this level.
When the light irradiation surface of solar cells, silicon material was part of photon absorption; the photon energy transfer to the silicon atom so that electron transfer occurred in Vietnam, a free electron in the P - N junction on both sides gathered to form a potentialdifference when the external circuit is switched on, the voltage effect, there will be current flow the external circuit to produce the output power. The essence of this process is: the photon energy into electrical energy conversion process.Solar radiation on earth is very huge, about 40 minutes of solar radiation on the earth, would be sufficient for the global human energy consumption for one year. It can be said that solar energy is truly inexhaustible energy. And solar power absolutely clean, no public harm. So solar power is known as the ideal source of energy.
Solar cell power generation principle:The solar cell is a response to light and can convert light energy into electric power devices. Photovoltaic effect can produce many kinds of materials, such as: monocrystalline silicon, polycrystalline silicon, amorphous silicon, gallium arsenide copper indium selenium. Their power is basically the same principle, the crystal as an example to describe the optical power of.P crystal silicon available afterphosphorus doped N type silicon, forming P N junction.
