Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.057
Publication date: 18th July 2019
Although the field of semiconductor nanocrystals (NCs) has been burgeoning for more than three decades, it has gained increased momentum with the introduction of hybrid lead halide perovskite NCs (PNCs). Besides outpacing traditional II-VI NCs in many of their staple applications, PNCs introduce novel and potentially revolutionary concepts, such as the hot carriers harvesting [1] and low threshold multiple exciton generation [2]. Albeit the reported ultra-slow hot carriers cooling times in PNCs underlie these new phenomena [3], they also open to other competitive and sometimes undesired relaxation processes.
In this presentation, our latest discoveries on the physics of hot carriers in the archetypal CH3NH3PbI3 and CH3NH3PbBr3 NCs will be presented. The focus of the presentation will be on trapping processes involving hot carriers, and their potential role in undermining the hallmark of hybrid perovskite photophysics, i.e., their defect tolerant electronic structure. Our latest results, combining PLQY, transient absorption, and pump-push-probe spectroscopy, reveal sub-ps trapping dynamics that complete the map of hot carriers’ physics in hybrid perovskites nanostructures. Hence, using a phenomenological trapping model, the complex interaction between hot carriers and traps is elucidated. Lastly, some strategies to tailor the hot carrier cooling will be provided. This work impacts many of the crucial PNCs applications that rely on non-resonant excitations (e.g., LEDs, solar cells) and provides a rationale for their further optimization.
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