Recently, Guo Xin, a researcher at the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, and Li Can, a member of the Chinese Academy of Sciences, have made new progress in the study of the stability of perovskite solar cells. The relevant research results were published in the Joule magazine of Cell Publishing Group.

Organic-inorganic hybrid perovskite solar cells (PSCs) have received widespread attention due to their high photoelectric conversion efficiency. In recent years, they have developed rapidly and become a research hotspot in the field of photovoltaics. However, the problem of poor device stability restricts its further development. Although the interface modification and doping can improve the stability of PSC, it cannot fundamentally solve the problem of poor stability of organic-inorganic hybrid perovskite materials. Therefore, improving the structural stability of the perovskite material itself is a key to fundamentally solve the PSC stability problem. In recent years, the Ruddlesden-Popper (RP) type two-dimensional layered perovskite material has attracted great attention and research interest, because its large-size organic cations have a hydrophobic substituent, and there is a Van der Waals interaction between the layers, which can be certain To a certain extent, the stability of perovskite materials has been improved. Previous studies have also shown that the stability of RP-type two-dimensional PSC is better than traditional three-dimensional PSC. However, the van der Waals weak interaction between such two-dimensional perovskite materials is difficult to ensure that the materials have sufficient structural stability.

In order to further improve the stability of two-dimensional perovskite materials and their devices, based on the idea of ​​"cancelling van der Waals interactions and improving structural stability," the team developed a Dion-Jacobson (DJ) type two-dimensional layered calcium Titanium material. Compared with RP type two-dimensional perovskite, DJ type two-dimensional perovskite has no interlayer van der Waals interaction, and its organic cations are connected to the inorganic perovskite layer by hydrogen bonds at both ends of the molecule, so it has better structural stability Sex. The photoelectric conversion efficiency of PSC prepared with this type of DJ-type two-dimensional perovskite material reaches 13.3%, and it is particularly noteworthy that its device stability has been significantly improved. The aging test of unpackaged devices under "dual 85" (85 ° C and 85% relative humidity) and a standard continuous sunlight condition shows that the efficiency of traditional three-dimensional and RP-type two-dimensional PSCs declines rapidly, while DJ type two After long-term testing, the dimension PSC can still maintain more than 95% of the photoelectric conversion efficiency, showing excellent humidity and heat stability and light stability. This work starts from improving the structural stability of perovskite materials and provides a new strategy for fundamentally improving the stability of PSC.

The above research work was supported by the National Natural Science Foundation of China Major Research Program.

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