All-inorganic perovskite battery with "flip-chip" structure design
Recently, the photoelectric conversion efficiency of the all-inorganic perovskite battery newly developed by the City University of Hong Kong reached 16.1%, and the efficiency certified by the Chinese Academy of Metrology was also as high as 15.6%. Ren Guangyu, vice president of academic affairs and chair professor of chemistry and materials science at the City University of Hong Kong, pointed out that the breakthrough of this research is to find a simple method for manufacturing all-inorganic perovskite batteries with both photoelectric conversion efficiency and stability.
It is reported that the research team of the City University of Hong Kong has been exploring ways to improve the photoelectric conversion efficiency of all-inorganic perovskites in recent years. They added a special small molecule 6T1C-4F in the process of preparing perovskite to reduce defects on the surface or grain boundaries. The results of the study found that the open circuit voltage was significantly increased from 1.10V to 1.16V, and the fill factor and short-circuit current were improved after the addition of 6T1C-4F for passivation.
The research results also showed that after 350 hours of continuous irradiation, the energy conversion efficiency of the battery only dropped by about 15%. This shows that adding 6T1C-4F to passivate the surface of the perovskite can not only protect the surface of the perovskite from moisture, oxygen and light, but also increase the size of the crystal particles, which can effectively reduce grain boundary defects and current Loss, so that the photoelectric conversion efficiency and stability of the all-inorganic perovskite battery are improved.
According to Ren Guangyu, the structural design of this all-inorganic perovskite battery is "flip-chip", suitable for making laminated solar cells. Its characteristic is that it can absorb sunlight of different spectra at the same time. Therefore, the scientific research community predicts that its photoelectric energy conversion rate is expected to exceed 30% in the future. (Li Huiyu)
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