Publication date: 15th December 2025
Mixed Tin/Lead (Sn/Pb) perovskites have the potential to achieve higher performances in single junction solar cells than Pb-based compounds. Nowadays, the most used hole transport layer (HTL) for Sn/Pb based perovskite solar cells is PEDOT: PSS, even if there are many doubts on a possible detrimental role of this conductive polymer on th performance e long-term stability of the active layer.
Recently, we have shown that self-assembled monolayer [2-(3, 6-dibromo-9H-carbazol-9-yl) ethyl] phosphonic acid (Br-2PACz) can have great advantages when used as HTL of solar cells of active layer Cs0.25FA0.75Sn0.5Pb0.5I3 [1]. Several factors seem to determine the increased perfomance respect to devices using PEDOT: PSS as HTL, the perovskite layer deposited on SAMs show an higher crystallinity, with reduced pinhole density and larger grains but also a reduced defect density at the burried interface. In my presentation I will show devices above 25% efficiency combining this HTL and a proper surface passivation.
[1] M. Pitaro, J. Sebastian Alonso, L. Di Mario, D. Garcia Romero, K. Tran, T. Zaharia, M. B. Johansson, E. M. J. Johansson, M. A. Loi, Mater. Chem. A, 2023,11, 11755-11766.
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