What affects the mechanical properties of flexible perovskite solar cells?

Flexible perovskite solar cells have the advantages of light weight, high power-to-mass ratio, and compatibility with curved surfaces, making them show outstanding advantages in wearable, self-powered portable electronic products. This type of battery requires each functional layer to have excellent mechanical properties, and its mechanical properties will gradually decrease due to the difference in flexibility and interface contact of each functional layer during repeated bending.

Recently, Yang Dong, a researcher at the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, and Liu Shengzhong, a researcher, published a review article on flexible perovskite solar cells, systematically exploring the key factors affecting the mechanical properties of flexible perovskite solar cells, and looking forward to the current challenges and future application prospects in this field. The results were published in the German Journal of Applied Chemistry.

Schematic diagram of a flexible perovskite solar cell. Photo courtesy of Dalian Chemical Properties

Through the summary and analysis of the latest research progress and practical application of flexible perovskite solar cells, this review paper proves that the important way to improve the mechanical and environmental stability of flexible perovskite solar cells lies in selecting the appropriate flexible substrate, carrier transport layer and flexible electrode. At the same time, the team further discussed additive engineering, interface modification engineering, and new functional layer materials, which confirmed that these factors are key factors to improve the performance of flexible perovskite solar cells. In addition, the team also summarized the composition and properties of each functional layer from a chemical point of view, and analyzed the effects of each parameter of each functional layer, including Young’s modulus, thermal expansion coefficient, thickness and tensile strain on the mechanical properties of flexible perovskite solar cells. These chemical and physical parameters are internal factors that describe the deformability of materials and are of great significance for analyzing the mechanical properties of flexible perovskite solar cells.

The team further analyzed the preparation methods, mechanics and stability of large-area flexible perovskite solar cells, and looked forward to the opportunities and challenges of the future commercial application of large-area flexible perovskite solar cells. (Source: Sun Danning, China Science News)

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