A team of researchers from Japan, China, and Switzerland recently reported in the US "Science" magazine that they used thin-film doping technology to create a per square meter perovskite solar cell with a notarized efficiency. At 15%, it is the highest efficiency of internationally certified perovskite batteries.
Compared with traditional crystalline silicon solar cells, perovskite solar cells are lower in cost and easier to produce, and their photoelectric conversion efficiency has been greatly improved in recent years. Therefore, it is currently most likely to realize low-cost industrialization to replace fossil energy. Solar cell. The US "Science" magazine even rated it as one of the top ten scientific breakthroughs in 2013.
Although the perovskite solar cell has developed rapidly, it is difficult to deposit an ultrathin film on a large area of ​​the substrate without generating defects such as voids, and it is difficult to prepare it in a large area. Most of the previously reported high-efficiency results are based on battery devices with an area of ​​0.1 square centimeters. In the field of photovoltaics, the standard solar cell efficiency measurement requires a battery area of ​​at least 1 square centimeter.
In the new study, researchers from the Japan Material Research Institute, Shanghai Jiaotong University, Huazhong University of Science and Technology, and the Swiss Federal Institute of Technology Zurich, Switzerland, used common semiconductor process doping techniques to give nickel oxide films to the inorganic interface layer of perovskite batteries. Heavy doping of lithium and magnesium increases the conductivity by about 10 times.
Han Liyuan, chief researcher and head of the Photovoltaic Materials Group at Japan's Material Research Institute, explained that due to the increased conductivity, they can increase the thickness of heavily doped nickel oxide films without sacrificing cell efficiency, thereby greatly reducing the hole density of the film, etc. As a result, a high-efficiency perovskite solar cell with an area of ​​1 square centimeter was finally prepared.
The researchers also conducted a notarization of the perovskite solar cells they produced at the Japanese Standard Photovoltaic Measurement Laboratory with a notarization efficiency of 15% and was included in the “Solar Cell Efficiency Table†of the 46th issue of 2015.
Thin-film solar cells can be divided into three generations: the first generation is an amorphous silicon thin-film battery, with a maximum efficiency of 13.6%; the second generation is an inorganic compound thin-film solar cell, such as a copper indium gallium selenide battery efficiency of 21.7%; third On behalf of the battery is still in the development stage, including dye-sensitized solar cells (11.9% efficiency), organic thin-film solar cells (11.5% efficiency) and perovskite solar cells.
Han Liyuan said: "The efficiency of our certified perovskite battery (15%) is much higher than that of the same generation of dye-sensitized solar cells and organic thin-film solar cells, despite monocrystalline silicon (25.6%) and polysilicon (20.8%) of solar energy. There is still a certain gap in the efficiency of the battery, and we believe that the efficiency of the perovskite battery will soon exceed 20%, and even exceed 25% in the near future.†(Reporter Lin Xiaochun)
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