Perovskites can provide solar cells with significant productivity gains, but it is not easy to maintain their stability and performance. Australian scientists have invented how to get rid of one of the shortcomings of this material. It turns out that it is possible to avoid deformations of Perovskite photocells by exposure to high-intensity light.
The reason for the popularity of Perovskite in the field of solar energy is how quickly they compare with traditional materials in performance. In ten years, these cells have achieved efficiency of more than 20 percent, and in tandem design with silicon – and 27.7 percent, writes New Atlas.
The new study looks at a subspecies of perovskite photovoltaic cells, the so-called hybrid halide perovskites, which provide better resistance to moisture, ultraviolet light and high temperatures than previous designs. However, they also have problems with stability, which is expressed in light-induced phase segregation, reports New Atlas.
This happens when light, including sunlight, hits the element and reduces its ability to absorb light, which ultimately reduces performance. Given the potential of hybrid halide perovskites, scientists are working hard to understand the cause of this phenomenon and potential solutions.
A team from the University of Melbourne found that by exposing hybrid halide perovskites to high-intensity light, it was possible to neutralize the load that occurs in the ion lattice structure. Instead of triggering the segregation of key elements, this load connects them, completely avoiding deformation.
“On a normal sunny day, the intensity is so low that deformation does occur,” explained Stefano Bernardi, co-author of the study. – But if we find a way to increase the excitation above a certain threshold, for example, by using a concentrator, then the segregation disappears.