Principle Of Single Crystal Solar Panel

When the sun shines on the semiconductor p-n junction, a new hole electron pair is formed. Under the action of the electric field of the p-n junction, the holes flow from the N region to the p region, and the electrons flow from the p region to the N region. After the circuit is connected, a current is formed. This is the working principle of photoelectric effect solar cells.

Solar power generation there are two ways of solar power generation, one is light heat electricity conversion, the other is light electricity direct conversion.

1. The light heat electricity conversion mode uses the heat energy generated by solar radiation to generate electricity. Generally, the solar collector converts the absorbed heat energy into the steam of the working medium, and then drives the steam turbine to generate electricity. The former process is light heat conversion process; The latter process is a thermal electric conversion process, which is the same as ordinary thermal power generation The disadvantage of solar thermal power generation is its low efficiency and high cost. It is estimated that its investment is at least 5 ~ 10 times higher than that of ordinary thermal power stations A 1000MW solar thermal power station requires an investment of US $2-2.5 billion, with an average investment of US $2000-2500 for 1kW. Therefore, it can only be used in special occasions on a small scale, and large-scale utilization is not economical, and it can not compete with ordinary thermal power plants or nuclear power plants.

2. Direct conversion mode of light and electricity. This mode uses photoelectric effect to directly convert solar radiation energy into electrical energy. The basic device of light and electricity conversion is solar cells. Solar cell is a device that directly converts solar energy into electrical energy due to photovoltaic effect. It is a semiconductor photodiode. When the sun shines on the photodiode, the photodiode will convert the solar energy into electrical energy and generate current. When many cells are connected in series or in parallel, they can become a solar cell array with relatively large output power. Solar cell is a promising new power source, which has three advantages: permanence, cleanness and flexibility The service life of solar cells is long. As long as the sun exists, solar cells can be used for a long time with one-time investment; Compared with thermal power generation and nuclear power generation, solar cells will not cause environmental pollution; Solar cells can be large, small and medium-sized at the same time, ranging from medium-sized power stations with a million kilowatts to solar cell packs for only one household.