Publication date: 9th October 2020
In this talk, I will show results of using femtosecond (fs) time-resolved transient absorption and terahertz techniques to interrogate the photobehavior of a perovskite/QDs (Ps/QDs) film. Armed with these techniques, we were able to extract the real time dynamics (fs to ps regime) of excitons, and charge carriers happening in this hybrid material, and the interface between both materials. While the decays are dominated by e and h transition from PS to QDs, the increase in the QDs size results in an acceleration of the charge carriers’ transitions represented by the total transfer rate constants of electrons and holes. We extract the diffusion times and transfer rate constants to the interfaces. Furthermore, pumping with different fs-laser fluences indicates photoformation of excitonic states, which acceleration decreases the contribution of undesirable charge carriers trapping and non-radiative recombination within PS. Our results elucidate the importance of the QDs size for improving the efficiency of LEDs based on these nanocomposites.
This work was supported by the MINECO (Spain) through project MAT-2017-8653-R, Generalitat Valenciana via Prometeo Grant Q-Devices (Prometeo/2018/098), and the European Research Council (ERC) via Consolidator Grant (724424—No-LIMIT). PP acknowledges the support from National Science Centre (Poland) through project No. 2017/26/D/ST3/00910.
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