HZB achieves new world record for silicon perovskite tandem cell

A world efficiency record of 32.5 percent has been achieved at Helmholtz-Zentrum Berlin (HZB) for a tandem solar cell with a bottom cell made of silicon and a top cell made of perovskite. The results of the team led by Silvia Mariotti and Eike Köhnen as lead authors of the study were confirmed by the European Solar Test Installation (ESTI) in Italy.
According to an HZB release, a key factor in the success was the development of an interface modification that largely suppressed charge carrier recombination losses. In addition, the team »applied detailed analysis to understand the specific properties of the interface modification« and modified the structure of the cells accordingly.
A world record for silicon perovskite tandem cells was last achieved at HZB in late 2021, but the value at the time was significantly lower at 29.8 percent. This summer, a team from Swiss Ecole Polytechnique Fédérale de Lausanne (EPFL) reported a big jump to 31.3 percent. With the now once again significant increase to 32.5 percent, »the HZB tandems is now in ranges previously only achieved by expensive III/V semiconductors« says HZB’s scientific director Bernd Rech.
© PHOTON

Related News