Publication date: 10th April 2024
The excess resistivity of grain boundaries in ion-conducting oxides is generally attributed to the presence of space-charge layers in which oxygen vacancies are depleted. Acceptor cations are commonly assumed to take a uniform concentration profile throughout the sample (Mott–Schottky case). This simplification enables a simple analysis of impedance data with closed-form expressions, but it disregards that acceptor cations will typically be able to accumulate within the space-charge layers at sintering temperatures, at which the acceptor cations are mobile. Upon cooling, the immobilised acceptors will then retain an accumulated profile. This aspect is taken account of by the restricted-equilibrium model.
In this work, we explore the effects of restricted equilibria on grain-boundary properties by means of continuum simulations. Our implementation of a drift–diffusion framework allows for the calculation of impedance spectra for space-charge scenarios with a realistic thermal history, using acceptor-doped CeO2 as a model system. These results reveal the errors that arise from analysing complex space-charge situations with the simplified Mott–Schottky expressions. We also discuss how fundamental differences between elevated-temperature and room-temperature experimental techniques may arise, in the model electroceramic SrTiO3, from the influence of restricted equilibria.
nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.
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.
International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
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.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.