Proceedings of Online nanoGe Fall Meeting 20 (OnlineNFM20)
Publication date: 4th October 2020
Mixed halide perovskites (MHPs) under photoirradiation phase segregate into I- and Br-rich domains and, if in contact with a solvent, the film will then expel iodine into solution. Hole trapping at the I-site in MHPs dictates the iodine migration. We have now succeeded in modulating the iodide expulsion process in MHPs through externally applied electrochemical bias. At anodic potentials, electron extraction at the electrode interface becomes more efficient, leading to build-up of holes within the MHP film. This in turn favors phase segregation and increases the rate iodine expulsion. Conversely, at cathodic bias we facilitate electron-hole recombination within the MHP film and slow down iodine expulsion. The tuning of EFermi through external bias modulates charge extraction at the perovskite electrode interface and indirectly controls the build-up of holes, which in turn induces iodine expulsion. Suppressing iodine migration in perovskite solar cell is important for attaining greater stability of perovskite solar cells since they operate under internal bias.
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