In terms of solving energy security, reducing carbon dioxide emissions, and response to climate change, photovoltaic batteries play an important role.As a new generation of photovoltaic technology, the perovskite solar battery has the advantages of high efficiency and large -scale processing of solution, which is expected to greatly reduce the cost of commercial photovoltaic devices.
After nearly ten years of development, the maximum efficiency of perovskite polycrystalline battery exceeds 26%, which is very close to crystal silicon batteries, but its work stability lags behind crystal stability. Silicon batteries are one of the key factors that affect their commercial use.
Although the researchers have developed a variety of strategies to improve stability, such as optimizing the quality of the film, the defect of the surface interface, the component regulation, etc. Titanium battery T90, its working life is often only thousands of hours, and cannot meet commercial needs.
One key reason for the attenuation of the efficiency attenuation of the battery battery is the migration of halogen ion -induced by electric field, which will cause material degradation and defect.Among the perovskite polycrystalline film, ion migration occurs mainly in the crystal world rich in halogen vacuum.
In comparison, due to the elimination of the crystal world, its ion migration activation has been significantly improved due to eliminating the crystal world. Ideal material.
In addition, high -efficiency single crystal batteries are also the prerequisite for studying the relationship between ion migration and device stability.The growth of single crystals in oligituctite is generally based on the solution method. The "residual growth solution pollution crystal surface" is a common problem facing this method, which will seriously damage the nature of the material and battery performance.
In order to overcome this problem, the professor team of Shandong University learned from the "self -cleaning effect" of lotus leaves and improved the surface hydrophilicity of the chip by introducing the self -assembly molecular layer on the crystal surface.As a result, when the growth is over, it can spontaneously eliminate residual growth solutions, which will significantly reduce surface impurities.
Figure | Chen Zhaolai (Source:)
While improving the nature of the material, the research team will also be the efficiency of single crystal perovskite batteries Raising to 23.4%is the highest efficiency of single crystal batteries before.
In general, this work uses the surface problems of the long -term solution of the solution that has troubled the long -term academic circles.
(Source: Angeewandte Chemie International Edition)
Recently, the relevant papers have "self-self "Single Crystal Single Crystal Single Crystal on the surface" () is issued on Angeewandte Chemie International Edition [1]. Liu Nianqiao is the first author and serves as a communication author.
Figure | Related papers (Source: Angewandte Chemie International Edition)
At present, it is not perfectly limited by the growth technology. Ferbiche ingot ore ore ore The size of the chip is still small, the crystallization quality needs to be improved, and the density density of the surface interface is large.It is said that overall view of the field of single crystal perovskite battery faces the following key scientific issues:
One, iodine ion migration of the perovskite/negative interface;
Second, there is a significant gap between the crystallization quality of the perovskite chip than the single crystal of the block; Surface defect passivation.
Therefore, the research team will follow the solution of these key problems in the future: that is, developing advanced surface defect passivation and interface blocking strategies, combined with polishing and polishing processes, to regulate the thickness of the chip. Strive for the filling factor of single crystal battery to reach 90%, and the photoelectric conversion efficiency exceeds 27%.
If these key problems can be solved smoothly, the perovskite monocrystall crystal battery will have large commercial feasibility.From the history of the development of crystal silicon batteries: Because the price of single crystal silicon is higher, it has brought opportunities to the development of polycrystalline silicon batteries.
With the development of single crystal growth technology, single crystal silicon batteries finally eliminated polycrystalline silicon batteries. Therefore, the team believes that single crystal perovskite batteries may have huge development opportunities.
It is reported that they have been engaged in post -doctoral research abroad.He said: "During this period, I was fortunate to be the two most well -known scholars in the worlds most well -known scholars in the single crystal field in the perception: professors and professors. From them, I learned to do scientific research. Take the initiative to explore the key scientific issues in the field of where they are. "
He continues:" Compared to the extensive study of perovskin polycrystalline batteries, the single crystal battery I studied after returning to China There are obvious gaps in efficiency and stability, and there are only a handful of researchers involved in this field. We have no good ideas for a while to continue to improve the performance of single crystal perovskite batteries, especially how to stabilize. Should the research direction of the research should be given up? "
The current unit is a national key laboratory of crystal materials, which is committed to the growth and application of single crystal materials.In the end, with the support of the laboratory, with the accumulated efforts of him and students for two or three years, the key issues in the field gradually clarified, and scientific research was slowly on track.
"Among them, a well -known professor in our laboratory told me that single crystal must be better than polycrystalline in terms of materials, so single crystal perovskite batteries must have there must be there must be Hope.
Therefore, we must adhere to our own research characteristics and adhere to the characteristics of our national key laborator It has a great influence. "Represents.
Reference information:
1.liu, n., li, n., jiang, c., m., wu , J., & amp; Chen, Z. (2024). Perovskite Single Crystals with Selface for Efficient Photovoltaics.angewandte Chemie International EDITION, E20231 4089.
Types: Liu Yaun
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