TU-TESL

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(picture source: unist official website) transparent solar energy (TSC) is a new type of equipment, which has the advantages of transparency and photoelectric conversion, and is expected to be used in portable electronic equipment, vehicles or buildings. Therefore, flexibility, color perception and efficiency must be considered. Most of the existing TSC batteries are based on perovskite, organic matter, amorphous silicon and dyes, but the material rigidity or coloration transparency limits its application to a large extent. Researchers at Ulsan National University of science and Technology (unist) in South Korea have developed a transparent, flexible, efficient and even stretchable solar cell, foreign media reported. Based on the silicon microwires integrated into the transparent polymer matrix, the researchers effectively used independent thin films to build transparent solar cells. A transparent conductive film is arranged at the bottom of the battery, and a heterojunction is formed between the p-type polymer semiconductor and the n-type silicon at the top of the device. Adjust the device transparency by adjusting the distance between microlines, which is between 10% and 55%. According to the test, in the bending state or after the cyclic bending test, the performance of the battery remains unchanged, without obvious decline. This shows that TSC battery has excellent flexibility. In this study, transparent and stretchable independent microwire array / polymer composite membranes lay the foundation for the future development of TSC batteries. However, in the standard TSC battery, in order to achieve transparency, it is necessary to sacrifice efficiency, and it is difficult to obtain high performance. In order to solve this problem, researchers propose a new method. The researchers say solar cells basically generate electricity by absorbing light. Therefore, how to maintain battery transparency and achieve high performance at the same time is very challenging. They discovered the absorption mechanism inside the silicon microwire array and developed a new microwire shape that can control the optical path. "As a result, we have successfully improved our light absorption capacity. In transparent solar cells, this helps to generate photocurrent and keep the cell transparent. " This kind of transparent solar cell is made of independent thin film material based on advanced light absorption technology. Under 10% visible transparency, the power conversion efficiency can reach more than 8%, which is comparable to the most advanced neutral transparent solar cell based on organic and perovskite. "These devices are based on silicon wafers," the researchers said. In the silicon solar cell market, silicon wafer has been widely used. Therefore, this solid, ultra light and flexible platform is feasible, and it is expected to be put into practical application in the future and become a commercial transparent solar cell. "