Trap passivation and suppressed electrochemical dynamics in perovskite solar cells with C60 interlayers

In this study, we quantify the impact of C60-passivation layers in Cs0.15FA0.85PbI2.75Br0.25 double-cation perovskite solar cells. We apply a combination of impedance spectroscopy, photoluminescence (PL) spectroscopy, and X-ray diffraction (XRD) to identify the origin for the increase in power conversion efficiencies and operational stability...

Universal control strategy for anomalous ionic-electronic phenomenology in perovskite solar cells efficiency measurements

The unprecedented increase of photovoltaic perovskites performance metrics has been obscured by the puzzling phenomenology underlying the device's anomalous ionic/electronic landscape. Thus, the establishment of a reliable measurement protocol of efficiency measurements, unanimously adopted by the perovskite's community, is indeed necessary to...

Analysis of Light‐Enhanced Capacitance Dispersion in Perovskite Solar Cells

Interface engineering has become one of the most important research strategies to harness the full potential of perovskite solar cells. Photovoltaic community seems to herald the imminent development of 30% efficient perovskite devices with competitive lifetimes, subject, among other aspects, to clarify “what happens under the interfaces.” One...

Understanding the Hydration Process of Salts: The Relation between Surface Mobility and Metastability

In this work, the relation between mobility and metastability is investigated. This is done under pure water vapor vacuum conditions. First, the properties of the metastable zone under pure water vapor conditions are investigated and compared to those under atmospheric conditions. Second, mobility is investigated using electrochemical impedance...

Evaluation of active layer thickness influence in long-term stability and degradation mechanisms in csfapbibr perovskite solar cells

Perovskite solar cells (PSCs) have become very popular due to the high efficiencies achieved. Nevertheless, one of the main challenges for their commercialization is to solve their instability issues. A thorough understanding of the processes taking place in the device is key for the development of this technology. Herein, J-V measurements have...

The dominant role of memory-based capacitive hysteretic currents in operation of photovoltaic perovskites

The potential opportunities of perovskite-based technology to further advance in the photovoltaic field and implement an extensive industrial application, will mainly depend on whether some of its weaknesses, such as current density-voltage (J−V) hysteresis, can be overcome. In this sense, a critical aspect is the understanding and the...

Analysis of dynamical mechanisms of CsFAPbIBr perovskite solar cells

Perovskite Solar Cells (PSC) have attracted great attention due to the high efficiencies achieved in the past few years (up to 24.2 %). Perovskite semiconductors show excellent light absorption and large charge-carrier mobilities. In addition, device fabrication is low cost and easily up-scalable. However, the current density-voltage curve (J-V)...

Enhancement of oxygen evolution activity of nickel oxyhydroxide by electrolyte alkali cations

Herein, the effect of the alkali cation (Li+, Na+, K+, and Cs+) in alkaline electrolytes with and without Fe impurities is investigated for enhancing the activity of nickel oxyhydroxide (NiOOH) for the oxygen evolution reaction (OER). Cyclic voltammograms show that Fe impurities have a significant catalytic effect on OER activity; however, both...

Biodegradation of ballast tank coating investigated by impedance spectroscopy and microscopy

This research paper addresses the biodegradation process for ballast tank coatings in marine environments. As part of this new approach, a commercially available ballast tank coating was exposed to bacteria obtained from a culture collection and to a natural bacterial community isolated from a real ballast tank. The natural community was chosen...

Self-healing anticorrosive organic coating based on an encapsulated water reactive silyl ester: Synthesis and proof of concept

In this paper a self-healing anticorrosive organic coating based on an encapsulated water reactive organic agent is presented. A reactive silyl ester is proposed as a new organic reactive healing agent and its synthesis, performance, incorporation into an organic coating and evaluation of self-healing capabilities is described. Such silyl esters...

Influence of a biopolymer admixture on corrosion behaviour of steel rebars in concrete

Among the multitude of concrete structure pathologies, corrosion of rebars is one of the most important problems of concrete durability. In the context of sustainable development, it appears of primary importance to develop new means to protect the rebars against corrosion. This study aims to develop a new eco-friendly and corrosion-inhibiting...

Impedance Matching of a Micromesh Bolometer Placed in a Silicon Parallel Plate Waveguide Spectrometer

Micromesh bolometers have been used in several instruments working in the submillimeter band (e.g. [1]). The bolometers are usually placed inside a waveguide and consist of a mesh absorber, at a certain distance from a back short. The mesh is made of SiNi whose thermal conductivity is tuned to the incident power and operating temperature. The...

Efficiency control of cathodic protection measured using passivation verification technique in different concrete structures

It is well known that cathodic protection is the most useful method for stopping corrosion when the deterioration process has started, but the most important issue that is still missing in the cathodic protection studies is how to check its efficiency in a reliable way. This paper presents results of the protection efficiency obtained in...