Adding "Pyramid" to solar wafers is more effective

Solar cells have gradually entered our lives. How to improve the photoelectric conversion efficiency of solar cells and reduce the cost of batteries is a subject that has been explored and studied by the scientific community. On June 8th, the project “Study on Solar Cellulose Wool Process” attracted attention during the college student innovation practice project display of the 10th anniversary of Cheng Yin College of Southeast University.

The project leader, Yu Xiaoxiao, a student of the 2010 Chemical Engineering and Technology Program, introduced this project as a practice innovation project for university students in Jiangsu Province. Monocrystalline silicon solar cells in the photovoltaic industry are currently the fastest-growing solar cells. This project is mainly to increase the efficiency of monocrystalline silicon solar cells and reduce the cost of batteries.

On solar cells, the main function of the silicon wafer is to absorb and store solar energy. However, if sunlight shines on a smooth silicon wafer, a large part of it will be directly refracted and reflected. "If the surface of the wafer is 'added with velvet', the utilization of sunlight will be greatly increased." Project participant Tang Wenhui explained that the so-called "velvet" under magnification of the microscope is actually a pyramid shape, and the sun shines. On such four-sided vertebrae, multiple reflections occur, greatly increasing the absorption rate of light.

According to reports, tens of thousands of "pyramids" have to be "milled" on silicon wafers, including chemical corrosion, brine solution, mechanical notching, etc., but the cost is lowest, productivity is high, and the method is simple. .

Under the guidance of teachers Yang Yaping and Yao Gang under the guidance of teachers Yang Yaping and Yao Gang, the students of Southeast University Cheng Yin University successfully debugged the flocking liquid containing various additives through hundreds of experiments. The wafers were cleaned, soaked, rinsed, and blow dried. After processing, the final reflectivity of the silicon wafer was only 12.8%. The pyramid size is more reasonable, more uniform and more stable, and the photoelectric conversion efficiency of the monocrystalline silicon solar cell is effectively improved. “One of the highlights of our project is also the environmental protection. Compared to this, the content of volatile matter in the flocking liquid is greatly reduced.” Tang Wenhui told reporters, “In theory, the reflectivity of 12.8% should also be Can continue to reduce, we will continue to work through experiments."

The reporter also learned that at present, this project has reached the expected results in the laboratory stage, and passed the inspection of the industrial sector. In March, it has entered the pilot stage and strives to achieve industrial production as soon as possible. (Correspondent Xie Jingyuan reporter Yuan Tao)

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