Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.219
Publication date: 18th July 2023
Understanding the physicochemical properties of the materials and interfaces that constitute our devices is key to know which are their limitations and to elaborate strategies that improve their performance. Most of the standard electrical and optical techniques used in the characterization of photelectrochemical systems are stationary (or DC) techniques such as J-V curves, chronoamperometries, external and internal quantum efficiencies, etc. These techniques provide very useful information on the basic parameters of operation of the devices and inform us if our efforts to improve them are going in the right or the wrong direction. The limitation of these techniques is that they provide the answer of the devices as a whole and in most of the cases do not allow to identify the key parameters that control their response. Modulated (or AC) techniques allow to observe many details of the internal processes that are simultaneously occurring in our systems in-operando conditions. For instance, cyclic voltammetry, probably the most common modulated technique, is able to identify the energy of redox processes or if there are processes associated to charge accumulation or limitations that produce delays in charge delivery. Other modulated techniques such as impedance spectroscopy (IS), intensity modulated photocurrent spectroscopy (IMPS) or intensity modulated photovoltage spectroscopy (IMVS) are able, in the best of the cases, to differentiate the mechanisms of charge transport, transfer, accumulation and recombination occurring in the different materials and interfaces and the individual contributions, allowing to study them individually when they are assembled and working. In the worst cases, these techniques “only” allow to identify the dominant processes that determine the response of the devices. Therefore, the information obtained with these techniques may be of great help not only for understanding how our systems work but also to improve their performance. In this talk I will present some basic aspects of these techniques and how the information we extract from them may help us to understand the properties of photoelectrochemical devices.
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Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.
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The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
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