Publication date: 17th February 2025
Understanding the charge carrier dynamics in advanced optoelectronic materials is crucial for improving their efficiency and stability [1]. Transient absorption (TA) spectroscopy is a vital tool for investigating ultrafast photophysical processes in heterojunctions, providing insights into phenomena such as hot carrier thermalization, nonlinear recombination, and electron-phonon coupling [2]. TA spectroscopy also reveals charge carrier pathways and highlights the role of charge transport layers in accelerating recombination over time, spanning from picoseconds to nanoseconds, thereby offering a deeper understanding of the mechanisms that influence optoelectronic device performance [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, making them an exciting material, for example, in next-generation solar cells [4]. By combining stationary absorption, TA, and photoluminescence spectroscopy with in-depth structural analysis, we unveil the interplay between exciton dissociation, charge transfer, and recombination processes at the perovskite/MXene interface. Specifically, rapid charge transfer in the perovskite/MXene heterostructure is evidenced by the quenching effect observed through TA. Furthermore, we fabricated guanidinium-based quasi-2D perovskite solar cells (PSCs) that incorporate several MXenes as a composite material within the charge transport layers. In some configurations, the MXene-enhanced PSCs exhibited a relative 7%–10% improvement in performance compared to the reference device. Moreover, samples with MXenes showed less tendency for nonlinear recombination increase over time. Our results highlight the role of MXene as an efficient charge carrier. 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.
The research was done thanks to Polonez Bis project no. 2021/43/P/ST3/02599 co-funded by the National Science Centre (NCN, Poland) and the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska–Curie grant agreement no. 945339.
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