It is the goal of researchers of perovskite solar cells to greatly improve battery life based on guaranteed conversion efficiency. Recently, the cooperation results of Zhou Huanping's research group and the School of Chemistry and Molecular Engineering of the School of Chemistry and Molecular Engineering, Peking University, School of Chemistry and Molecular Engineering, "The use of Eu3+/Eu2+ redox ions to improve the working life of lead iodine perovskite solar cells", published online In the main issue of the international journal Science.
Device lifetime (ie, stability) and photoelectric conversion efficiency are two key factors that determine the ultimate power generation cost of a solar cell. The crystalline silicon solar cells commonly used around the world are close to the theoretical upper limit and the cost is hard to fall. Therefore, perovskite solar cells that take into account cost and efficiency advantages have become the biggest research hotspots in this field.
A perovskite solar cell uses an organic-inorganic hybrid metal halide having a perovskite crystal structure as a light absorbing layer. Since 2009, it has attracted much attention due to its simple preparation method, low production cost, and excellent photoelectric performance. The efficiency has rapidly increased from 3.8% to 23.7%, making it the fastest growing photovoltaic technology. However, for perovskite batteries, its stability is the most difficult problem to solve, and at present, China pays less attention to the cost, process and life expectancy of the perovskite industrialization.
Aiming at the instability of perovskite materials under the action of light and heat radiation, this paper proposes a new mechanism to introduce the redox ion pairs of Eu3+/Eu2+ in the active layer of perovskite. This ion pair eliminates both Pb0 and I0 defects and cycles through the life 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 that limits the stability of the lead-halide perovskite battery, and will vigorously promote the industrial production of the perovskite solar cell. .
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.
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