Scientists in China took a closer look at the role of defects in limiting the performance of perovskite solar cells, demonstrating a screening effect that could be tuned to make material defects “invisible” to charge carriers, greatly improving cell performance. Using this approach they demonstrate a 22% efficient inverted perovskite solar cell, and theorize several new pathways to even higher performance.
Scientists in the United States discovered that hydrogen plays a leading role in the formation of defects in a perovskite film, which limit their performance as PV devices. The discovery, according to the researchers, offers further insight into observations already established by trial and error and could help to push the impressive efficiency achievements already made by perovskites even higher.
Researchers in Germany claim to have overcome the main challenge for the development of large-area perovskite PV modules – scaling up from the cell to the module level. They achieved an efficiency of up to 16.6% on a module surface of more than 50 centimeters squared, and 18% on a module with an area of 4 centimeters squared.
Scientists demonstrated two new approaches to improving the stability of perovskite solar cells. By both incorporating rubidium into the structure of the perovskite, and adding a film of two-dimensional perovskite as a capping layer, they were able to demonstrate a significant reduction in the cell’s sensitivity to moisture. The group says its research will open up new routes to improved performance and stability in perovskite PV.
The Dutch consortium has achieved the record result by combining, in a four-terminal tandem configuration, an 18.6% efficient highly near-infrared transparent perovskite with a prototype of a c-Si interdigitated back contact (IBC) silicon heteroJunction (SHJ) cell developed by Japanese electronics manufacturer Panasonic. The perovskite cell was also combined with other kinds of solar cells and other remarkable record efficiencies were hit.
The result was achieved for a small area device with the size of 0.1 sq cm. The cell was fabricated with a Tin(IV) oxide electron transport layer modified with crystalline polymeric carbon nitrides (cPCN).
China’s UtmoLight has developed a new PV module with an area of just 63.98 cm2 and a 20.5% efficiency rate, as certified by Japan Electrical Safety & Environment Technology Laboratories.
Scientists have set a new efficiency record for a single-junction perovskite solar cell at 25.6%. The cell additionally showed operational stability for 450 hours, and intense electroluminescence with external quantum efficiencies of more than 10%.
Japanese scientists have used spray pyrolysis deposition to fabricate perovskite solar cells based on a titanium oxide electron transport layer. They claim that the cells have the potential to reach a power conversion efficiency rating of more than 30%.
U.S. researchers are using a data fusion approach to identify the most stable perovskites for PV cells. Their machine-learning method combines perovskite test results with first-principles physical modeling to identify the best candidates.
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