The hottest new breakthrough of Shanghai Jiaotong

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New breakthrough of Shanghai Jiaotong University: large-scale low-cost solar power generation is expected to achieve

solar photovoltaic technology is one of the most potential technologies to solve the human energy crisis. However, at present, the preparation cost of solar photovoltaic cells is high and the process is complex, so it is difficult to achieve large-scale application. It was learned from Shanghai Jiaotong University today that the latest research results of Professor hanliyuan's team at the State Key Laboratory of metal matrix composites, School of materials science and engineering, Shanghai Jiaotong University are expected to break the deadlock. The team used a more economical and safe new method to prepare a large-area perovskite film dozens of times thinner than cicada wing, which has taken an important step towards the goal of large-scale low-cost solar power generation. This achievement was recently published in the internationally renowned academic journal Nature

researcher Yang Xudong and Professor Han Liyuan of the school of materials science and engineering of Shanghai Jiaotong University are the co correspondents, and Dr. Chen Han, Dr. Ye Fei and Dr. Tang Wentao are the co first authors. Shanghai Jiaotong University, Japan Institute of materials and materials, Suzhou Liyuan new energy technology company and the Federal Institute of technology in Lausanne, Switzerland are the cooperative research units

it is understood that perovskite materials were first used in photovoltaic technology in 2009, and its photoelectric energy conversion efficiency has rapidly increased to 22.1%, exceeding the efficiency level of polysilicon solar cells, while the power generation cost is lower than that of silicon cells. However, this new type of solar cell is "difficult to do". In order to meet the practical needs of the battery, the perovskite material film at the key parts must be large enough and of good quality to ensure that the photoelectric energy conversion efficiency of the battery is high enough. At this stage, the area of perovskite solar cells with more than 20% certification efficiency can only reach the size of "rice grains". Han Liyuan's team spent three years on the preparation of large-area high-quality perovskite films, developed a perovskite battery module with an effective area of 36.1cm2, obtained a certification efficiency of 12.1% for the first time in an international certification body, and established the first world record for the efficiency of large-area perovskite modules. The emergence of this achievement means that in the future, perovskite photovoltaic technology has the possibility of going out of the laboratory and realizing large-scale industrialization

the price moves when the wind blows. The effect of the one-time forming pressure assisted preparation method adopted by Han Liyuan's team is better than that of the previous rotary coating solution method source/related papers

perovskite films are required to be uniform, dense and crystalline. The thickness of the perovskite film in the battery is dozens of times thinner than that of cicada wing, so it is very difficult to prepare. The two traditional preparation methods of "vacuum evaporation" and "organic solvent" have their own defects. In the perovskite material composed of iodine, lead and ammonium methoxide, the team adopts the method of "ammonium methoxide" subduing "ammonium methoxide", introduces ammonium methoxide gas, and allows the ammonium methoxide molecules in the gas to react with the ammonium methoxide ions in the perovskite material. After mixing the products, the liquid of perovskite material can be obtained. Han Liyuan said that this liquid can quickly release methyl ammonium gas into perovskite solid, and the released methyl ammonium gas can be used again to react with methyl ammonium iodide solid powder and lead iodide solid powder to realize the recycling of materials. At the same time, researchers innovated the film preparation method, changed the traditional "pancake spreading" method, and adopted the pressure assisted preparation method of one-time forming. By controlling the pressure, the liquid material was coated on the flat substrate, and the evenly distributed liquid thin electronic tensile testing machine software functional film was obtained

this research has become the realization of large-scale production of low-cost perovskite sun. Researchers at East Peking University in the United States have developed a new method that must be confirmed by the formula. It can provide a new development direction for premature infants or other important medical equipment 3D printing customized catheter energy battery modules. Next, the team will apply the preparation technology of small-area high-efficiency devices to the modules, hoping to achieve the module efficiency equivalent to the current silicon solar cells; At the same time, the stability of perovskite battery will be further explored to accelerate the commercialization process of this type of battery

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