Enamine-Based Cross-Linkable Hole-Transporting Materials for Perovskite Solar Cells

The development of the simple synthesis schemes of organic semiconductors can have an important contribution to the advancement of related technologies. In particular, one of the fields where the high price of the hole-transporting materials may become an obstacle toward successful commercialization is perovskite solar cells. Herein, enamine-based materials that are capable of undergoing cross-linking due to the presence of two vinyl groups are synthesized. It is shown that new compounds can be thermally polymerized, making the films resistant to organic solvents. This can allow the use of a wet-coating process for the deposition of the perovskite absorber film, without the need for orthogonal solvents. Cross-linked films are used in perovskite solar cells, and, upon optimization of the film thickness, the highest power conversion efficiency of 18.1% is demonstrated.

Automated summary

The development of simple synthesis schemes of enamine-based materials with cross-linking capabilities has led to improved efficiency in perovskite solar cells. These new compounds can be thermally polymerized to create films resistant to organic solvents, allowing for wet-coating processes without the need for orthogonal solvents. By optimizing film thickness, a high power conversion efficiency of 18.1% has been achieved in perovskite solar cells utilizing these cross-linked films.