Will new research improve the life of perovskite batteries?

It is the goal of perovskite solar cell researchers to greatly improve the battery life on the basis of ensuring the conversion efficiency. A few days ago, the collaborative results of Zhou Huanping's research group in the Department of Materials Science and Engineering of Peking University and Yan Chunhua's research group in the School of Chemistry and Molecular Engineering used Eu3+/Eu2+ redox ion pairs to increase the working life of lead-iodine perovskite solar cells, published online in International The main issue of the journal 'Science'. Device life (i.e. stability) and photoelectric conversion efficiency are two key factors that determine the final power generation cost of solar cells. The efficiency of crystalline silicon solar cells commonly used in the world is close to the theoretical upper limit, and the cost is difficult to drop. Therefore, perovskite solar cells that take into account both cost and efficiency advantages have become the biggest research hotspot in this field. Perovskite solar cells use organic-inorganic hybrid metal halides with a perovskite crystal structure as the light-absorbing layer. Since 2009, they have attracted attention due to simple preparation methods, low production costs and excellent photoelectric performance. Photoelectric conversion The efficiency rose rapidly from 3.8% to 23.7%, making it the fastest growing photovoltaic technology. However, regarding the perovskite battery, its stability is the most difficult problem to solve, and at present, our country pays little attention to the cost, process, and life span of the perovskite industrialization which needs to be solved urgently. In this study, a new mechanism was proposed for the instability of perovskite materials under light and heat radiation applications, that is, the introduction of Eu3+/Eu2+ redox ion pairs in the perovskite active layer. The ion pair can eliminate Pb0 and I0 defects at the same time, and it can be used in cycles during the service life of the device. Based on this, the initial efficiency of the battery has been improved, especially its long-term stability has been significantly improved, which solves an important and essential problem that limits its stability in lead halide perovskite batteries, and will vigorously promote the industrial production of perovskite solar cells. . , The temperature effect of silicon solar cells The core unit of solar photovoltaic power generation is solar cells. At present, the most important thing for large-scale commercial applications is silicon solar cells: monocrystalline silicon solar cells, polycrystalline silicon solar cells and amorphous silicon solar cells. The influence of temperature on silicon solar cells is mainly reflected in the changes of solar cells' open-circuit voltage, short-circuit current, peak power and other parameters with temperature. The open circuit voltage of a single solar cell decreases with the increase of temperature. The voltage temperature coefficient is (210～212) mv/℃, that is, for every 1℃ increase in temperature, the open circuit voltage of a single solar cell decreases by 210～212mv; the solar cell is short-circuited. The current increases with the increase of temperature; the peak power of solar cells decreases with the increase of temperature (directly affects the efficiency), that is, for every 1°C increase in temperature, the peak power loss rate of solar cells is about 0135～0145% For example: a silicon solar cell operating at 20°C has an output power that is 20% higher than that of a silicon solar cell operating at 70°C. A single solar cell module is usually composed of 36 single solar cells connected in series. According to the results of field measurement in Xining area, the back surface temperature of solar cell modules can reach 70°C in summer, and the working junction temperature of solar cells can reach 100°C at this time (the rated parameters are calibrated under 25°C). The open circuit voltage of the component will be reduced by approx.