It is the goal of perovskite solar cell researchers to greatly improve battery life while ensuring conversion efficiency. A few days ago, the collaboration result of the research group of Zhou Huanping, Department of Materials Science and Engineering, Peking University Institute of Technology, and the research group of Academician Yan Chunhua, School of Chemistry and Molecular Engineering, "Using Eu3 + / Eu2 + redox ion pairs to improve the working life of lead-iodine perovskite solar cells", published online In the main issue of the international journal "Science".
Device life (ie stability) and photoelectric conversion efficiency are the two key factors that determine the final cost of solar cell power generation. The efficiency of crystalline silicon solar cells commonly used in the world is close to the theoretical upper limit, and it is difficult to reduce costs. 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 perovskite crystal structure as the light-absorbing layer. Since 2009, they have attracted attention because of simple preparation methods, low production costs and excellent photoelectric performance. Photoelectric conversion The efficiency increased rapidly from 3.8% to 23.7%, becoming the fastest growing photovoltaic technology. However, for the perovskite battery, its stability is the most difficult problem to solve, and China currently pays less attention to the cost, process, and life-span that the perovskite industry needs to solve urgently.
In this study, a new mechanism was proposed for the instability of perovskite materials under the influence of light and heat radiation, that is, the introduction of Eu3 + / Eu2 + redox ion pairs in the perovskite active layer. This ion pair can eliminate Pb0 and I0 defects at the same time, and play a role in the life cycle of the device. Based on this, the initial efficiency of the battery is improved, especially its long-term stability is significantly improved, which solves an important essential problem in the lead halide perovskite battery that limits its stability, and will effectively promote the industrial production of perovskite solar cells .
According to reports, the breakthrough can also be extended to other perovskite optoelectronic devices, and also has important reference significance for other inorganic semiconductor devices facing similar problems. (Wang Yingxia)
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