Sergei A. Cherevkov

ITMO University

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АВ

А. В. Баранов

ITMO University

A. V. Fëdorov

ITMO University

Elena V. Ushakova

City University of Hong Kong

Aleksandr P. Litvin

Jilin University

Aliaksei Dubavik

ITMO University

Petеr S. Parfenov

ITMO University

МА

М. А. Баранов

ITMO University

Anastasiia V. Sokolova

City University of Hong Kong

ТК

Т. К. Кормилина

Austrian Centre for Electron Microscopy and Nanoanalysis

Evgeniia A. Stepanidenko

ITMO University

Cooperative Institutions

ITMO University

126

Russian Academy of Sciences

St Petersburg University

Moscow Power Engineering Institute

Ioffe Institute

Institute of Information Technologies

Peter the Great St. Petersburg Polytechnic University

Institute of Macromolecular Compounds

Lomonosov Moscow State University

State Optical Institute named after SI Vavilov

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Spectroscopic study of defect states in CdSe nanoplatelets

Journal of Physics Conference Series (2019)

Maksim Miropoltsev Yulia Gromova V. N. Smelov Sergei A. Cherevkov Т. К. Кормилина

Abstract Here we report investigation of red-shifted defect photoluminescence observed in two-dimensional colloidal cadmium selenide nanoplatelets. We used absorption, photoluminescence and photoluminescence excitation measurements to show that red-shifted photoluminescence bands are related directly to nanoplatelets and may originate from surface imperfections as well as be a result of interaction between different nanoplatelets in the solution. We also found that the defect photoluminescence may be easily altered by simple mechanical treatment, including sonication and stirring, thus disclosing the ways to control nanoplatelets emission over time.

Cadmium selenide

Photoluminescence excitation

Sonication

10.1088/1742-6596/1410/1/012131

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Citations (1)

Non-Toxic Ternary Quantum Dots AgInS2 and AgInS2/ZnS: Synthesis and Optical Properties

Optics and Spectroscopy (2018)

D. A. Kurshanov Yulia Gromova Sergei A. Cherevkov Elena V. Ushakova Т. К. Кормилина

10.1134/s0030400x1812010x

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Citations (13)

Ternary Composites with PbS Quantum Dots for Hybrid Photovoltaics

The Journal of Physical Chemistry C (2019)

Aleksandr P. Litvin Ivan D. Skurlov Iurii G. Korzhenevskii Aliaksei Dubavik Sergei A. Cherevkov

Ternary hybrid photovoltaics based on polymers, fullerenes, and colloidal semiconductor quantum dots (QDs) bring together high efficiency and technological flexibility. To increase the performance of such hybrid solar cells, a thorough control over both film morphology and charge transport is required. In the present work, the morphology and optical properties of films of binary and ternary blends of PbS QDs with poly(3-hexylthiophene-2,5diyl) and [6,6]-phenyl C71 butyric acid methyl ester have been investigated by steady-state and time-resolved photoluminescence spectroscopy, atomic force microscopy, and confocal laser-scanning microscopy. The influence of postdeposition and liquid-phase ligand exchange procedures on film properties has been considered. It is shown that the liquid-phase iodide passivation improves both film quality and charge-transfer efficiency. The mixture of three components facilitates charge transfer in the hybrid material, but a thorough control over QD size and ligand type is required.

Passivation

10.1021/acs.jpcc.8b11685

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Citations (10)

Self-organization of lead sulfide quantum dots of different sizes

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2014)

Elena V. Ushakova Valery V. Golubkov Aleksandr P. Litvin Petеr S. Parfenov Sergei A. Cherevkov

X-ray structural analysis is used for investigation of structures, obtained by self-organization from nanoparticles - lead sulfide (PbS) quantum dots (QDs) of different sizes - deposited on a glass substrate or embedded in a porous matrix. These nanostructures obtained by both methods represent ordered close-packed structures of the nanoparticles. The configuration of obtained structures does not depend on the nanoparticle size and type of substrate and matrix.

Lead sulfide

Matrix (chemical analysis)

10.1117/12.2051635

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Citations (5)

Ligand-Dependent Morphology and Optical Properties of Lead Sulfide Quantum Dot Superlattices

The Journal of Physical Chemistry C (2016)

Elena V. Ushakova Sergei A. Cherevkov Aleksandr P. Litvin Petеr S. Parfenov Dominika-Olga A. Volgina

Small angle X-ray scattering, atomic force microscopy, optical microscopy, and absorption and luminescence spectroscopy have shown that the type and amount of surface organic ligands have a strong impact on the morphology and optical properties of 2D superlattices formed by lead sulfide quantum dots (QDs) of different sizes deposited on a glass substrate. This allows control of the process of QD self-assembly, the homogeneity of the superlattices, and the interparticle distance by optimization of the amount of surface ligands. It has been found that annealing and aging also influence the stability of the structural and optical properties of the superlattices.

Lead sulfide

10.1021/acs.jpcc.6b07734

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Citations (27)

Magnetic Circular Dichroism in 2D Colloidal Semiconductor Nanocrystals

Optics and Spectroscopy (2018)

Yulia Gromova Maksim Miropoltsev Sergei A. Cherevkov В. Г. Маслов А. В. Баранов

10.1134/s0030400x18110139

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Citations (6)

Fractal Properties of CdTe Quantum Dots Dendrites-=SUP=-*-=/SUP=-

Журнал технической физики (2020)

Olga M. Kushchenko Semyon Rudyi L.N. Borodina Sergei A. Cherevkov Yu. Rozhdestvensky

Here we present the analyses of fractal properties of CdTe dendrites. The spectral characteristics of dendrites obtained at different acids of the initial solution were investigated. We demonstrate the displacement of the local luminescence peak depended on the branches of the dendritic structure. The fractal dimension has been calculated by the box-counting method. We obtained the correlation between the local peak of luminescence and the Minkowski dimension.

Cadmium telluride photovoltaics

10.21883/os.2020.08.49721.1009-20

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Optical Properties, Morphology, and Stability of Iodide-Passivated Lead Sulfide Quantum Dots

Materials (2019)

Ivan D. Skurlov Iurii G. Korzhenevskii Anastasiia S. Mudrak Aliaksei Dubavik Sergei A. Cherevkov

Iodide atomic surface passivation of lead chalcogenides has spawned a race in efficiency of quantum dot (QD)-based optoelectronic devices. Further development of QD applications requires a deeper understanding of the passivation mechanisms. In the first part of the current study, we compare optics and electrophysical properties of lead sulfide (PbS) QDs with iodine ligands, obtained from different iodine sources. Methylammonium iodide (MAI), lead iodide (PbI2), and tetrabutylammonium iodide (TBAI) were used as iodine precursors. Using ultraviolet photoelectron spectroscopy, we show that different iodide sources change the QD HOMO/LUMO levels, allowing their fine tuning. AFM measurements suggest that colloidally-passivated QDs result in formation of more uniform thin films in one-step deposition. The second part of this paper is devoted to the PbS QDs with colloidally-exchanged shells (i.e., made from MAI and PbI2). We especially focus on QD optical properties and their stability during storage in ambient conditions. Colloidal lead iodide treatment is found to reduce the QD film resistivity and improve photoluminescence quantum yield (PLQY). At the same time stability of such QDs is reduced. MAI-treated QDs are found to be more stable in the ambient conditions but tend to agglomerate, which leads to undesirable changes in their optics.

Lead sulfide

Passivation

Quantum yield

Silver iodide

10.3390/ma12193219

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Citations (11)

Luminescent Microthermometry of Laser Heating Using Semiconductor Nanoplatelets

Optics and Spectroscopy (2018)

D. Gozhalskiy Т. К. Кормилина Viktor Zakharov Sergei A. Cherevkov Aliaksei Dubavik

Atmospheric temperature range

10.1134/s0030400x18110127

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Citations (2)

Strongly Luminescent Composites Based on Carbon Dots Embedded in a Nanoporous Silicate Glass

Nanomaterials (2020)

Evgeniia A. Stepanidenko Pavel Khavlyuk Irina A. Arefina Sergei A. Cherevkov Yuan Xiong

Luminescent composites based on entirely non-toxic, environmentally friendly compounds are in high demand for a variety of applications in photonics and optoelectronics. Carbon dots are a recently developed kind of luminescent nanomaterial that is eco-friendly, biocompatible, easy-to-obtain, and inexpensive, with a stable and widely tunable emission. Herein, we introduce luminescent composites based on carbon dots of different chemical compositions and with different functional groups at the surface which were embedded in a nanoporous silicate glass. The structure and optical properties of these composites were comprehensively examined using electron microscopy, Fourier transform infrared transmission, UV-Vis absorption, and steady-state and time-resolved photoluminescence. It is shown that the silicate matrix efficiently preserved, and even enhanced the emission of different kinds of carbon dots tested. The photoluminescence quantum yield of the fabricated nanocomposite materials reached 35–40%, which is comparable to or even exceeds the values for carbon dots in solution.

Nanoporous

Silicate glass

Carbon fibers

10.3390/nano10061063

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Citations (19)