Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO24)
Publication date: 25th April 2024
Organic molecules, bearing strongly electron-withdrawing CF3SO2- (TFSI-) groups, have been widely used to enhance the photoluminescence of metal dichalcogenides through electrostatic doping, without any chemical passivation, as well as to passivate traps in silicon and InAs [1]. Likewise, TFSI has been adopted for p-doping in typical organic semiconductors such as carbon nanotubes, polymers and small molecules such as spiro-MeOTAD [2]. However, these pseudo-halogen anions have never been systematically tested to modify the surface of a metal halide perovskite film in an optoelectronic device.
Here, two TFSI-based compounds with strong acidity (trifluoromethanesulfonimide and n-phenyl-bis(trifluoromethanesulfonimide) are used in order to post-treat the surface of n-doped lead halide perovskite films. Indeed, steady-state and transient photoluminescence spectroscopy proved the passivation effect of the non-halogen anions. XPS and FTIR analysis proved the interactions between –C-F and S=O groups of the non-halogen anion with both ammonium (methylammonium and formamidinium) and Pb2+ cations. As a result, TFSI-treated perovskite solar cells have shown enhanced stabilized power output efficiencies in a solar cell configuration and improved operational stability under typical thermal stress. This work paves the way for the use of (super)acids as excellent passivators of lead halide perovskites.
We acknowledge the financial support from the European Research Council (ERC) through Consolidator Grant (818615-MIX2FIX).
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