Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.166
Publication date: 22nd December 2022
Despite the relatively early level of development, Perovskite light-emitting diodes (PeLEDs) have reached outstanding luminance and radiative efficiency levels that roughly graze the maximum theoretical efficiency limits. Unfortunately, the complete understanding of the working principles and the photo-electrochemical mechanisms involved in the charge carrier generation/recombination dynamics is still a conundrum. Additionally, the strong ionic character of MHPs enables the migration of ions and the gradual formation of crystalline defects upon exposing to light and/or to an external electric field, which aggravate the complexity of these systems. In fact, these ionic processes are apparently coupled with those electrical involved in the generation of light, and seem to be connected with the widely reported limited long-term stability of the devices. Here, I will discuss on the exploitation of a new methodology based on the combination of two frequency-domain modulated techniques, i.e. electrochemical impedance spectroscopy (EIS) and light emission voltage-modulated spectroscopy (LEVS), aimed at reaching a full understanding of the working principles of perovskite LEDs. Particularly important is the deconvolution of the electrical, optical and ionic processes that are involved in the current-to-photon conversion, heat generation and/or degradation of the materials employed. We propose a new theoretical model and an equivalent circuit that considers both the non-radiative and radiative contributions, as a new tool for the advanced characterization of perovskite-based optoelectronic devices.
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