(271e) Tracking the Flow of Heat in Two-Dimensional Metal Halide Perovskites

Two-dimensional metal halide perovskites (2D-MHPs) are chemically and structurally diverse semiconducting materials with promising applications in photovoltaics and optoelectronics. The understanding of charge and heat transport is crucial for improving the performance and stability of devices made from these materials. I will discuss our recent efforts on developing time-resolved optical spectroscopy and imaging techniques, which permit the monitoring of heat flow in these hierarchically architecture materials. Specifically, I will present on a pump-probe microscopy technique, featuring spectrally tunable pump and probe pulses, single-nanosecond time resolution, and millisecond time windows. Using this technique, we investigated both out-of-plane and in-plane heat transfer in 2D-MHPs with varying compositions, as well as charge carrier transport in 3D-MHPs. The method opens new possibilities for the imaging of charge carriers, heat, and transient phase transformation processes, particularly in materials with spatially-varying composition, strain, crystalline structure, and interfaces. I will end my presentation by discussing how we can apply this technique for studying other material systems.