Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
DOI: https://doi.org/10.29363/nanoge.hopv.2022.084
Publication date: 20th April 2022
The interplay between free charge-carriers and excitons has long been explored in two-dimensional (2D) metal halide perovskites using ultrafast spectroscopy techniques, especially transient absorption spectroscopy (TAS) (1). Nevertheless, there is still not a cohesive understanding of what the underlying mechanisms are of carrier generation and relaxation, and a range of phenomena that have been investigated including exciton-phonon coupling, the presence of polarons formation, and even the existence of biexcitons (2,3). Due to quantum confinement and the high exciton binding energy (Eb) in 2D perovskites, the dominant species present under ambient conditions is excitons rather than free charge-carriers. This results in different optoelectronic properties compared to three-dimensional (3D) metal halide perovskites such as a shorter charge-carrier lifetime and decreased effective charge-carrier mobilities (4). Optical pump/ terahertz probe (OPTP) is a time-resolved spectroscopic technique that preferentially measures mobile species such as free charge-carriers but is not sensitive to excitons with high Eb, making it an advantageous technique in elucidating the underlying mechanism(s) taking place between the free charge-carriers and excitons. In this work, we employ OPTP to analyse the dynamics of free charge carriers in (PEA)2PbI4, and observe fast carrier cooling and exciton formation followed by slower bimolecular and monomolecular recombination processes. With those results, we can disentangle the dynamics between excitons and free charge-carriers to analyse transient absorption spectroscopy measurements, exploring exciton-phonon coupling, charge-carrier cooling, and exciton formation.
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International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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