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Interfaces play a crucial role in determining perovskite solar cells, (PSCs) performance and stability. It is therefore of great importance to constantly work toward improving their design. This study shows the advantages of using a hole‐transport material (HTM) that can anchor to the perovskite surface through halogen bonding (XB). A halo‐functional HTM (PFI) is compared to a reference HTM (PF), identical in optoelectronic properties and chemical structure but lacking the ability to form XB. The interaction between PFI and perovskite is supported by simulations and experiments. XB allows the HTM to create an ordered and homogenous layer on the perovskite surface, thus improving the perovskite/HTM interface and its energy level alignment. Thanks to the compact and ordered interface, PFI displays increased resistance to solvent exposure compared to its not‐interacting counterpart. Moreover, PFI devices show …
Publication date: 
1 Sep 2021

Laura Canil, Jagadish Salunke, Qiong Wang, Maning Liu, Hans Köbler, Marion Flatken, Luca Gregori, Daniele Meggiolaro, Damiano Ricciarelli, Filippo De Angelis, Martin Stolterfoht, Dieter Neher, Arri Priimagi, Paola Vivo, Antonio Abate

Biblio References: 
Volume: 11 Issue: 35 Pages: 2101553
Advanced Energy Materials