Jevgenij Chmeliov
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View article: Revealing Two Operation Modes of Perovskite Light‐Emitting Diodes Through Overshoot Pulses
Revealing Two Operation Modes of Perovskite Light‐Emitting Diodes Through Overshoot Pulses Open
In some applications, perovskite light‐emitting diodes (PeLEDs) shall operate in pulsed mode. The generation of high‐intensity light pulses requires PeLED driving by high‐power electrical pulses, which can lead to deterioration of PeLED pe…
View article: Single pixel reconstruction imaging: Taking confocal imaging to the extreme
Single pixel reconstruction imaging: Taking confocal imaging to the extreme Open
Light nanoscopy is attracting widespread interest for the visualization of fluorescent structures at the nanometre scale. Recently, a variety of methods have overcome the diffraction limit, yet in practice they are often constrained by the…
View article: Environment-dependent chlorophyll–chlorophyll charge transfer states in Lhca4 pigment–protein complex
Environment-dependent chlorophyll–chlorophyll charge transfer states in Lhca4 pigment–protein complex Open
Photosystem I (PSI) light-harvesting antenna complexes LHCI contain spectral forms that absorb and emit photons of lower energy than that of its primary electron donor, P700. The most red-shifted fluorescence is associated with the Lhca4 c…
View article: Concentration Quenching of Fluorescence Decay Kinetics of Molecular Systems
Concentration Quenching of Fluorescence Decay Kinetics of Molecular Systems Open
Fluorescence concentration quenching occurs when increasing molecular concentration of fluorophores results in a decreasing fluorescence quantum yield. Even though this phenomenon has been studied for decades, its mechanisms and signatures…
View article: <i>trans</i>-Stilbene aggregates and crystallites in polystyrene films: microscopy and spectroscopy studies
<i>trans</i>-Stilbene aggregates and crystallites in polystyrene films: microscopy and spectroscopy studies Open
Aggregates and crystallites of trans -stilbene are formed spontaneously on the surface of a polystyrene film with smooth transition from a mono-molecular form to a monocrystal form when the concentration of stilbene is increased.
View article: Electric Field-Induced Quenching of MAPbI<sub>3</sub> Photoluminescence in PeLED Architecture
Electric Field-Induced Quenching of MAPbI<sub>3</sub> Photoluminescence in PeLED Architecture Open
Photoluminescence (PL) measurements are a widely used technique for the investigation of perovskite-based materials and devices. Although electric field-induced PL quenching provides additional useful information, this phenomenon is quite …
View article: Application of artificial neural networks for modeling of electronic excitation dynamics in 2D lattice: Direct and inverse problems
Application of artificial neural networks for modeling of electronic excitation dynamics in 2D lattice: Direct and inverse problems Open
Machine learning (ML) approaches are attracting wide interest in the chemical physics community since a trained ML system can predict numerical properties of various molecular systems with a small computational cost. In this work, we analy…
View article: Direct Tracking of Charge Carrier Drift and Extraction from Perovskite Solar Cells by Means of Transient Electroabsorption Spectroscopy
Direct Tracking of Charge Carrier Drift and Extraction from Perovskite Solar Cells by Means of Transient Electroabsorption Spectroscopy Open
The best perovskite solar cells currently demonstrate more than 25% efficiencies, yet many fundamental processes that determine the operation of these devices are still not fully understood. In particular, even though the device performanc…
View article: Single Pixel Reconstruction Imaging: taking confocal imaging to the extreme
Single Pixel Reconstruction Imaging: taking confocal imaging to the extreme Open
Light nanoscopy is attracting widespread interest for the visualization of fluorescent structures at the nanometer scale, especially in cellular biology. To achieve nanoscale resolution, one has to surpass the diffraction limit—a fundament…
View article: Ion Motion Determines Multiphase Performance Dynamics of Perovskite LEDs
Ion Motion Determines Multiphase Performance Dynamics of Perovskite LEDs Open
Perovskite light‐emitting diodes (PeLEDs) currently reach up to about 20% external quantum efficiency (EQE) and are becoming a promising technology for display and lighting applications. Still, many issues regarding their performance remai…
View article: Carrier Tunneling from Charge Transfer States in Organic Photovoltaic Cells
Carrier Tunneling from Charge Transfer States in Organic Photovoltaic Cells Open
Charge transfer (CT) states play a key role in the functioning of organic solar cells; however, understanding the mechanism by which CT states dissociate efficiently into free charges remain a conceptual challenge. Here, the electric field…
View article: Double Charge Transfer Dominates in Carrier Localization in Low Bandgap Sites of Heterogeneous Lead Halide Perovskites
Double Charge Transfer Dominates in Carrier Localization in Low Bandgap Sites of Heterogeneous Lead Halide Perovskites Open
Heterogeneous organic‐inorganic halide perovskites possess inherent non‐uniformities in bandgap that are sometimes engineered and exploited on purpose, like in quasi‐2D perovskites. In these systems, charge carrier and excitation energy mi…
View article: Aggregation-related quenching of LHCII in liposomes revealed by single-molecule spectroscopy
Aggregation-related quenching of LHCII in liposomes revealed by single-molecule spectroscopy Open
Incorporation of membrane proteins into reconstituted lipid membranes is a common approach for studying their structure and function relationship in a native-like environment. In this work, we investigated fluorescence properties of liposo…
View article: Light-harvesting complexes access analogue emissive states in different environments
Light-harvesting complexes access analogue emissive states in different environments Open
Photosynthetic antennae regulate the level of excitations in the membrane by tuning their excited state properties. Here we show that the antennae access the same light-harvesting and dissipative states in different in vitro environments.
View article: Instantaneous switching between different modes of non-photochemical quenching in plants. Consequences for increasing biomass production
Instantaneous switching between different modes of non-photochemical quenching in plants. Consequences for increasing biomass production Open
Photosynthetic productivity usually saturates far below the maximum solar light intensity, meaning that in those conditions many absorbed photons and the resulting electronic excitations of the pigment molecules can no longer be utilized f…
View article: Electroluminescence Dynamics in Perovskite Solar Cells Reveals Giant Overshoot Effect
Electroluminescence Dynamics in Perovskite Solar Cells Reveals Giant Overshoot Effect Open
High performance of both photovoltaic and electroluminescent devices requires low nonradiative recombination losses. In perovskites, such loses strongly depend on the carrier traps related to the mobile ions and vacancies, causing I- V hys…
View article: Fluctuating antenna model: Applications and prospects
Fluctuating antenna model: Applications and prospects Open
Recently, we proposed a simple conceptual fluctuating antenna model (FAM), describing excitation diffusion and trapping in a continuous medium, where variations of the excitation transfer pathways are taken into account by the introduced f…
View article: Decay- and evolution-associated spectra of time-resolved fluorescence of LHCII aggregates
Decay- and evolution-associated spectra of time-resolved fluorescence of LHCII aggregates Open
Non-photochemical quenching (NPQ) is responsible for the protection of the photosynthetic apparatus of plants from photodamage at high-light conditions. It is commonly agreed that NPQ takes place in the major light-harvesting complexes (LH…
View article: Influence of the Carotenoid Composition on the Conformational Dynamics of Photosynthetic Light-Harvesting Complexes
Influence of the Carotenoid Composition on the Conformational Dynamics of Photosynthetic Light-Harvesting Complexes Open
Nonphotochemical quenching (NPQ) is the major self-regulatory mechanism of green plants, performed on a molecular level to protect them from an overexcitation during the direct sunlight. It is believed that NPQ becomes available due to con…
View article: The carotenoid pathway: what is important for excitation quenching in plant antenna complexes?
The carotenoid pathway: what is important for excitation quenching in plant antenna complexes? Open
Plant light-harvesting is regulated by the Non-Photochemical Quenching (NPQ) mechanism involving the slow trapping of excitation energy by carotenoids in the Photosystem II (PSII) antenna in response to high light.