| Work Detail |
Scientists in China and Canada have developed an additive that forms covalent bonds with the organic materials in a perovskite solar cell, reducing defects and degradation.
Scientists have developed an additive and treatment for perovskite solar cells that alters their chemical structure and reduces the effects of defects and degradation mechanisms. The cells that underwent the treatment reached initial efficiencies of around 24% and maintained 98% of these after 1,000 hours of solar illumination. Control cells produced without treatment had lost 35% of their initial yield after only 200 hours under the same illumination.
The cells also performed well in high-temperature tests, retaining 97.6% of initial efficiency after more than 500 hours exposed to 60ºC. In this test, the reference cells lost 27% of the initial performance under the same conditions. Cell treatment and testing is fully described in the article “ Covalent bonding strategy to enable non-volatile organic cation perovskite for highly stable and efficient solar cells ”. highly stable and efficient), published in Joule .
The scientists used various imaging techniques to understand how their treatment worked, and concluded that bisdiazirine, a polymeric material present in the additive, formed covalent bonds with the organic element of the perovskite material. “…the covalent bond strategy facilitates the immobilization of ions, inhibits the escape of organic components and eliminates metallic Pb. Thus, it reveals better thermal, illumination resistance, and electrical bias resistance properties of perovskites.”
Closer inspection
Through further characterizations, simulations, and comparisons with devices built without the treatment, the group was able to observe the covalent bonding strategy in action and confirm its role in reducing several undesirable effects that lead to performance loss in solar cells. of perovskite, as well as contributing to its initial performance by reducing the appearance of defects. "This work suggests a novel and effective strategy to confine the loss of organic components from perovskites to realize highly efficient and ultra-stable perovskite solar cells."
The cells in the study were manufactured using a spin-coating process, common in laboratories but not suitable for large-scale production. However, a spin-out company from Canadas Victoria University, Xlynx Materials, has begun to commercialize the treatment under the name BondLynx, and is inviting companies working on the commercialization of perovskite solar cells to collaborate on other projects or to join. purchase the materials to use in their own essays. |
