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Excitons, bound electron-hole pairs, in Two-Dimensional Hybrid Organic Inorganic Perovskites (2D HOIPs) are capable of forming hybrid light-matter states known as exciton-polaritons (E-Ps) when the excitonic medium is confined in an optical cavity. In the case of 2D HOIPs, they can self-hybridize into E-Ps at specific thicknesses of the HOIP crystals that form a resonant optical cavity with the excitons. However, the fundamental properties of these self-hybridized E-Ps in 2D HOIPs, including their role in ultrafast energy and/or charge transfer at interfaces, remain unclear. Here, we demonstrate that > 0.5 um thick 2D HOIP crystals on Au substrates are capable of supporting multiple-orders of self-hybridized E-P modes. These E-Ps have high Q factors (> 100) and modulate the optical dispersion for the crystal to enhance sub-gap absorption and emission. Through varying excitation energy and ultrafast measurements, we also confirm energy transfer from higher energy upper E-Ps to lower energy, lower E-Ps. Finally, we also demonstrate that E-Ps are capable of charge transport and transfer at interfaces. Our findings provide new insights into charge and energy transfer in E-Ps opening new opportunities towards their manipulation for polaritonic devices., 5 figures plus supporting information

The equipment of outdoor substations are operated in complex atmosphere and electromagnetic environments for a long time. They are often affected by these complex environments and special corrosion occurs, which is not conducive to long-term stable operation of the substation and may affect the quality of power. Therefore, it is necessary to explore the influence of various typical factors on the corrosion degree of substation equipment in complex environment. In this paper, the corrosion simulation of substation equipment is carried out by COMSOL software, and the influence of electromagnetic factors such as SO 2 , salt load and leakage current on the corrosion degree is explored. The study found that salt load, SO 2 and pH can significantly accelerate the corrosion of the equipment, and the degree of influence is large.