The most advanced tandem solar cells today, composed of a silicon base and a perovskite top layer, can transform roughly one-third of the sunlight they receive into electrical power. These are record values, especially for a potentially very inexpensive technology. A team at the Helmholtz-Zentrum Be
Photo of the perovskite/silicon tandem solar cell. The active area in the middle of the wafer is enclosed by the silver electrode. Credit: Johannes Beckedahl/Lea Zimmerman/HZB
The research field is extremely competitive, with many groups worldwide working in this area. Now the HZB team has again been the first to present a solid and scientifically rigorous peer-reviewed technical publication with precise data sets from the measurements as well as detailed information on the structure of the tandem cell.
Using special measurement techniques, the researchers were able to analyze the fundamental processes at the interfaces and in the individual layers of the tandem cell in detail and then further optimize them based on a deeper understanding. The developments were then combined and transferred to tandem solar cells, with further adjustments to the top electrode for improved optics.
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