Our new article reporting record 33.7% efficiency for perovskite-silicon tandem solar cells came out in Science!

August 2, 2024

Our recent article in Science Magazine details our record efficiencies of 33.2% and 33.7% reported in 2023 (with the latest figures now reaching 34.6%).

In our previous reports (see publications), we focused on the interfaces of perovskite subcells in tandem structures. Now, with this work, we understand better the importance of addressing the bulk of the perovskite absorbers as well. We explore how our additive approach enhances the stability of perovskite films. 

The in situ formation of a cyclic cation, which establishes robust hydrogen bonds with iodide in multiple directions, significantly enhances the performance and stability of perovskite-silicon tandem solar cells. In this study, we demonstrate that a trace additive, methylenediammonium dichloride, generates tetrahydrotriazinium during film crystallization, which is integrated into the lattice. This species resists deprotonation and possesses numerous nitrogen atoms, thereby increasing its hydrogen-bonding capacity. As a result, a perovskite-silicon tandem cell with an illuminated area of 1 square centimeter achieved a power conversion efficiency of 33.7%.

You can read the article via the link for free.