Publication date: 17th February 2025
Understanding the charge carrier dynamics in advanced photovoltaic materials is crucial for improving their efficiency and stability [1]. Transient absorption (TA) spectroscopy is a vital tool for investigating ultrafast photophysical processes in heterojunction, that provides insights into phenomena like hot carrier thermalization, nonlinear recombination, and electron-phonon coupling [2]. TA spectroscopy also reveals recombination pathways, and highlights the role of charge transport layers in accelerating recombination over time, ranging from picoseconds to nanoseconds, offering a deeper understanding of the mechanisms influencing perovskite solar cells efficiency [3].
In this study, we investigate the ultrafast charge carrier dynamics in quasi-2D perovskite/MXene heterostructures, a novel class of hybrid materials with promising applications in optoelectronics. Mxenes have already shown their versatility in enhancing charge transport, light absorption, and stability makes them an exciting material for next-generation solar cells [4]. By combining stationary absorption, transient absorption, and photo luminescence spectroscopy with in-depth structural analysis, we unveil the interplay between exciton dissociation, charge transfer, and recombination processes at the perovskite/MXene interface. Our results highlight the role of MXene as an efficient charge carrier, significantly suppressing non-radiative recombination pathways and enhancing charge carrier lifetimes. Additionally, the heterostructure exhibits strong interfacial coupling, facilitating rapid exciton separation and efficient charge transport. These findings not only provide fundamental insights into the light-matter interactions at the nanoscale but also pave the way for the design of high-performance, stable, and flexible optoelectronic devices.
We thank project No. 2021/43/P/ST3/02599 co-funded by the National Science Centre and the European Union's Horizon 2020 research and innovation program under the Marie Skłodowska–Curie grant agreement no. 945339.
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