Perovskite solar cells (PSCs) can be made from cheap materials, are efficient, have more power than traditional silicon solar cells, and can be recycled. However, one of the current drawbacks that prevent their collection is their lack of operational (A way to improve the stability of PSC) stability.
Now, scientists from EPFL and Sungkyunkwan University in South Korea have found a way to improve the stability of PSC. The researchers focused on the degradation of the important elements of perovskite, which can be damaged by exposure to moisture, heat and light. The study was conducted by a team of professors Michael Grätzel (EPFL) and Nam-Gyu Park (Sungkyunkwan University), and published in Science.
The scientists looked at two crystal surfaces, a term that refers to the flat surface of a crystal, characterized by the same arrangement of atoms. The arrangement of these atoms and particles can affect the properties and behavior of the crystal, such as its stability and response to external stimuli such as humidity or temperature.
The researchers examined the (100) and (111) facets of the perovskite crystal. The (100) facet is a plane perpendicular to the c axis of a crystal with its atoms arranged in a repeating pattern in the form of a square grid.
In the facet (111), the atoms are arranged in a triangular grid. The research found that the (100) phase, which is common in thin films of perovskite, is more prone to damage because it can quickly turn into a non-conductive charge when exposed and light. On the other hand, the (111) face was found to be more stable and resistant to damage.
The researchers also identified the cause of the damage and found that it was due to the strong bond between the perovskite and the liquid, which caused the change from a stable termination to an unstable termination. They used this information to develop a strategy called “facet engineering”, in which they use unique ligand molecules to create stable facets (111). This results in perovskite films that are stable and resistant to both water and heat.
This study represents an important step in the development of PSC, as stability is a major obstacle in their business. The result makes the best understanding of how different parts of the crystals help in the film; By finding the most difficult methods and finding the way to taste their taste, PSCs can be supported by the start of the power of power and reset.
