According to local media reports in Japan, aiming at the new generation of perovskite solar cell materials for solar cells, researchers at the Advanced Science and Technology Research Center of the University of Tokyo have achieved a high conversion efficiency of 20.5% without using rare metals such as rubidium And stabilizing power generation.The stability of the crystalline structure has been achieved by adding more potassium on Earth.The research team conducts long-term durability tests and evaluates and discusses the practical applications of Panasonic, Toshiba and other enterprises.
The so-called perovskite solar cells, is the use of a perovskite crystal structure of this material solar cells.Compared with the current mainstream of silicon solar cells, the manufacturing process is simple, low manufacturing costs.Currently, the practical benchmark conversion efficiency of more than 20% Of the solar cells, the use of rubidium, cesium and other rare metals to maintain structural stability.
The University of Tokyo's research team, by adding potassium to maintain the crystalline structure under certain conditions, succeeded in producing defect-free structured power layers without the use of rare metals at all. Since the electron flow is not hindered, the conversion efficiency is improved Power generation stability.
In addition, the research team also confirmed the use of potassium current and voltage changes in the way, can inhibit changes in power generation 'hysteresis' than the use of rubidium and other metals inhibit the effect of higher, more stable power generation can be achieved due to hysteresis The phenomenon is difficult to determine the correct conversion efficiency, which was a practical topic.
The University of Tokyo study is part of the New Energy and Industrial Technology Development Agency (NEDO) program, which aims to achieve 25% conversion efficiency by 2020 and 95% more efficiency after 10,000 hours of exposure.Therefore, considering the future Practical and universal, making materials that are readily available makes a lot of sense.
