There are mainly two forms of solar power generation, photo-thermal power generation and photovoltaic power generation. Photo-thermal power generation uses the heat energy generated by solar radiation to generate electricity. Photovoltaic power generation utilizes the photovoltaic characteristics of semiconductor materials to directly convert solar energy into electricity.
Solar cells that can generate electricity at night
Most people think that solar cells can only be used during sunny days, but it is not. As scientists deepen research into solar cells, solar cells that can generate electricity at night have been successfully developed. According to Xinhuanet, the "all-weather" solar cell works on the principle that when the sun shines on a solar cell, not all sunlight can be absorbed by the cell and converted into electricity. Only part of the visible light is effectively converted into electricity. To this end, the researchers introduced a key material into the battery that allows the solar cell to have a slightly higher photoelectric conversion efficiency during the day's sunlight, while also storing the energy of the unabsorbed visible and near-infrared light. In the material, it is released at night as monochromatic visible light. At this time, the monochromatic visible light is absorbed by the light absorber and converted into electric energy, thereby realizing that the solar cell can generate electricity both during the day and at night.
In addition, according to "Science and Technology Daily" report, the Australian National University has also developed a nano-materials with peculiar properties. The material has a nanometer-scale microstructure consisting of gold and magnesium fluoride, which can emit radiation in a specific direction. Change the shape to emit special light. This material can be used to make thermal photovoltaic cells and generate electricity in the dark by collecting heat.
Solar cells that can also be used in rainy days
In addition to the night, solar cells can also be used on cloudy days. "Science and Technology Daily" has reported that researchers at the Swiss Federal Institute of Technology in Lausanne use a perovskite material as a light trapping device and use an organic hole transport material to replace the electrolyte used in conventional batteries. This method improves the conversion efficiency of dye-sensitized solar cells to 15%, and also has a high conversion efficiency in cloudy and artificial light environments.
It is believed that through the efforts of scientists, the use of solar cells in the future will become more and more popular and convenient.
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