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Photovoltaic conversion rate of organic solar cells achieves record
- Jun 25, 2018 -

Organic solar cells have many advantages over traditional inorganic batteries. Silicon-based inorganic solar panels are expensive to produce, but carbon-based organic solar cells can be made cheaply into rolls. These rolls are thin enough to bend and twist in buildings or clothing, and can be made into any color, even transparent, In order to match the surrounding environment.

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However, the photoelectric conversion efficiency of organic solar cells is relatively low. In order to make breakthroughs, scientists at the University of Michigan gathered many advances in design and processing. First, they designed a system that combines dedicated layers to absorb visible and infrared light. In essence, they stacked two organic solar cells—one that absorbs light in the visible spectrum starting at 350 nanometers; the other absorbs near-infrared light at wavelengths up to 950 nanometers. The researchers said: "Battery itself has a photoelectric conversion efficiency of 10% to 11%. When they are stacked together, light absorption increases. In addition, we have also used an anti-reflective coating to increase the efficiency to 15%." The team also proved that their new designs, materials and process manufacturing yields more than 95%, which is very important for extending the manufacturing process to the industrial level.

Researchers believe that conversion efficiency can be further improved. The researchers explained: “The current can be increased by improving light absorption and minimizing the energy loss to increase the voltage. The calculation results show that the photoelectric conversion efficiency of such devices can reach 18% in the near future, which will help solar energy. Become truly clean energy everywhere.