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The production of solar cells is mainly based on semiconductor materials, and its working principle is to use photoelectric materials to absorb light energy and generate a photoelectric conversion effect. Depending on the materials used, solar cells are classified as shown in Figure 1. According to the crystalline state, solar cells can be divided into […]
1) Photoelectric characteristics of solar cellsWhen light hits the solar cell, currents IR and IJ flow through the load resistance R of the solar cell and inside the solar cell, respectively, where IJ is the forward current through the PN junction. When the illumination is constant, the photocurrent IP=IR+IJ is also constant. The flow of […]
The solar cell is the smallest unit of photoelectric conversion, and its size generally ranges from 4 to 100 cm². The working voltage of the solar cell is about 0.5V, and the working current is 20~25mA/cm². Generally, it cannot be used as a photovoltaic power source alone. After the solar cells are packaged in series […]
Only a small part of the light energy projected on the entire illuminating surface of the solar cell can be converted into electricity, because it is affected by many factors. The radiation of sunlight in outer space is basically constant, but after absorption by the atmosphere with different compositions and thicknesses, including the selective absorption […]
A silicon atom has 14 electrons, which are distributed on three electron layers. The two electron layers inside have been filled. Only the outermost layer lacks four electrons, which is half full, as shown in Figure 1. In order to achieve a stable structure in the full-electron layer, each silicon atom can only combine with […]
Solar cells are devices that use the principle of photoelectric conversion to convert solar radiation light into electrical energy through semiconductor materials. This photoelectric conversion process is usually called the “photovoltaic effect.” Photovoltaic effect is abbreviated as photovoltaic effect, which refers to the phenomenon that light causes a potential difference between different parts of a […]
From the distribution of total solar radiation in China, Tibet, Qinghai, Xinjiang, southern Inner Mongolia, Shanxi, northern Shaanxi, Hebei, Shandong, Liaoning, western Jilin, central and southwestern Yunnan, southeast Guangdong, southeast Fujian, and Hainan The total amount of solar radiation in vast areas such as the eastern and western parts of the island and the southwestern […]
The basic structure of the sun is a sphere made of hot gas, mainly composed of hydrogen and helium, of which hydrogen accounts for 80% and helium accounts for 19%. Solar energy is the energy produced by the continuous nuclear fusion reaction process inside the sun. The average solar radiation intensity in the earth’s orbit […]
The size of the wind energy captured by the wind wheel of a wind turbine is proportional to the vertical windward area of the wind wheel. That is to say, for a certain wind wheel, when it is in the vertical wind direction (front windward), it captures more wind energy; and when it is not […]
(1) Mechanical speed limit protection.The purpose of setting the high wind speed limit protection is to effectively reduce the wind turbine when the wind turbine input energy is greater than the total energy that the system can consume and the energy stored by the system at a certain wind speed. The absorbed wind energy prevents […]