This indicator determines how much solar energy reaches the photovoltaic panel and can be converted into electricity. Representatives from the University of Toledo chose the all-perovskite cell in the tandem version, which currently offers an efficiency of up to 27.8%. The backstage of their activities is presented on the following pages. Goal.
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Since we are talking about a tandem structure, this practically means a two-layer structure. Each of these layers is responsible for absorbing a different part of the radiation, thanks to which it is possible to ultimately produce more energy than using only one layer.
In this case, as the research team members explained, the top perovskite layer consists of lead and tin, and the bottom layer is based on a conventional perovskite substrate. A modified hole transport layer, based on a P3CT compound with a mixture of lead iodide, also played an important role.
A tandem solar cell developed by scientists from the United States offers an efficiency of up to 27.8%.
Although the parties themselves admit that the concept they have developed is still far from the point where this technology can be commercialized, there are other important aspects. The results so far show that it is possible to increase the stability of tandem solar cells made entirely of perovskite, ensuring very high efficiency. This is slightly lower than that provided by more common silicon cells.
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The power conversion efficiency reached 22.7% (in the case of the top layer), the open-circuit voltage was 0.884 V, the short-circuit current density was 32.0 mA/cm2, and the fill factor was 80.3%. Using an 18.7% active bottom layer and a hole transport layer made of phosphonic acid, the researchers were able to achieve an efficiency of 27.8%. The open-circuit voltage was 2.147 V, the short-circuit current density was 15.7 mA/cm2, and the fill factor was 82.6%.
