In an effort to prevent this, scientists from the Polytechnic of Lausanne and Sungkyunkwan University decided to focus on ways to improve the stability of perovskite solar cells. Their particular attention was drawn to the perovskite thin films’ brittleness. Among the factors that exacerbate this type of changes are humidity, heat and light. You can read about the researchers’ detailed findings on this topic at Sciences.
By analyzing so-called crystal facets whose atomic arrangements can influence the properties and behavior of the crystal itself, the scientists set out to gather information on perovskites. Based on the above systems, conclusions can be drawn about stability and response to external stimuli of cells, such as humidity or changing temperatures.
Examine (100) and (111) facets (the former refers to a plane perpendicular to the c-axis of the crystal in which the atoms are arranged in a repeating square lattice pattern; the latter refers to the atoms arranged in a triangular lattice).
Perovskite solar cells are an alternative to silicon cells
As the authors deduced, the (100) facet—usually found in thin layers of perovskite—is particularly prone to failure. This is because it can quickly transition to an unstable and inactive phase in the presence of moisture. In the case of the oblique (111), the perishability was much lower.
The main reason for this undesirable phenomenon is the strong bonds between perovskites and water molecules. This resulted in the transition from the stable to the unstable phase. Using what scientists call face geometry, they propose using bonding molecules to create a more stable face (111). In such conditions, perovskite films with high stability and resistance to both moisture and heat were created.
Long term search results should lead to more stable video. By identifying the most stable aspects and looking for ways to increase this property, scientists can improve the overall stability of perovskite solar cells, which in turn will translate to lower absorption and production costs. Not only will the community benefit, but the environment as well.
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