In recent years, organic-inorganic hybrid perovskite solar cells have developed rapidly, and their photoelectric conversion efficiency has grown from 3.8% to the current certified efficiency of 25.5%, which is regarded as one of the new high-efficiency solar cells with the most application potential. Although perovskite solar cells have high photoelectric conversion efficiency, comparable to polycrystalline silicon thin film cells, the long-term stability of the cells has not reached commercial requirements. In addition, the traditional low-temperature solution method can conveniently prepare perovskite films, but the prepared perovskites are usually polycrystalline films, which tend to produce pinholes and defects on the grain boundary or surface. The generated defects can trap photogenerated carriers, limit the diffusion of carriers, reduce the lifetime of carriers, and also cause ion migration and diffusion, which ultimately leads to a decrease in device stability and efficiency. Design and Assembly of Functional Nanostructures, Chinese Academy of Sciences/Fujian Key Laboratory of Nanomaterials Researcher Gao Peng's research group has developed a series of D-Ï€-A porphyrin molecules to solve the stability problems caused by surface defects and moisture erosion of perovskite solar cells , And made important progress in the study of the mechanism of using the small porphyrin to passivate perovskite surface defects. Studies have found that treating the surface of perovskite with this series of porphyrin molecules CS0, CS1, and CS2 can effectively passivate the perovskite surface defects, thereby inhibiting the non-radiative recombination between the perovskite/HTM interface; due to the long hydrophobicity on the porphyrin molecules The presence of alkyl chains can effectively block the intrusion of water molecules in the air. The perovskite solar cells passivated based on CS0, CS1, and CS2 all showed good wet stability and improved device performance; the devices based on CS1 passivation achieved the highest cell efficiency of 22.37%. Tests show that the cyanoacrylic functional groups on the porphyrin materials numbered CS0-CS2 successfully passivated defects on the surface and grain boundaries of the perovskite lattice, thereby increasing the VOC and FF of the device. Related research results are published on Advanced Functional Materials. Gao Peng is the corresponding author of the paper, associate researcher Mai Qi is the first author of the paper, and PhD student Zhou Qin is the co-first author of the paper.
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