Publication date: 17th February 2025
Lead halide perovskites are promising for solar cell applications to approach the increasing demand for energy on earth. High defect densities and ion conductivity have a significant effect on the device performance and its insufficient long-term stability. In former work, a Stark shift was observed in dye-sensitized solar cells (DSC) with solid and liquid electrolytes. [1, 2] This is caused by a change in electric field across the dye molecules, which is decreases over time due to movement of ions. Similarly, ions in perovskite solar cell can screen electric fields upon applying electrical bias or light excitation. [3]
We use an organic dye as a probe to investigate the electric field at the buried interface of a lead halide perovskite solar cell. The TiO2 - FAPbBr3 perovskite interface is modified by inserting the L0 dye, and is probed by optical spectroscopy techniques. We observe a significant Stark effect upon illumination, which gives evidence for a change in the electric field at the TiO2 - dye - FAPbBr3 interface.
The research was funded by the Swedish Research Council, grant number 2022-03573_VR, and a travel grant by The Royal Swedish Academy of Sciences.
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