Mansurova Svetlana

• PhD
• Senior Researcher at National Institute of Astrophysics, Optics and Electronics

This study investigates the mechanisms and dynamics governing microhole formation in titanium nanofilms under the influence of a continuous-wave low-power laser emitting at 1070 nm. Two distinct configurations were explored: one in which the laser interacted with the titanium film in an air environment (referred to as configuration AM), and the oth...

This study employed time-of-flight secondary ion mass spectrometry (TOF-SIMS) to investigate degradation pathways at the nanoscale, utilizing its capacity for in-depth chemical and structural analysis through various methods, including depth profiling and 3D analysis. A key focus is the matrix effect in ToF-SIMS, which alters secondary ion yields b...

Metal-halide perovskites, known for their remarkable photovoltaic performance and ease of production, have garnered global attention in material science. Addressing scalability requires tackling the technology’s primary challenge: instability. Crucial insights into the complex chemistry of these materials are imperative for progress. The present st...

This study provides theoretical and experimental evidence that the voltage generated in perovskite films by interference fringes' motion at low velocities can be used as a tool for assessing ions' electric mobility in these materials. We introduce a theoretical model for running fringe (RF) photo-electromotive force (EMF) in bipolar semiconductors,...

This study aims to contribute to the development of theoretical and experimental tools for characterizing the transport properties of perovskite semiconductors. In the context of existing transport characterization methods for perovskites, there is a need for techniques that can accurately assess the critical transport parameters, such as diffusion...

This study focuses on investigating interfaces in perovskite solar cells (PSCs) fabricated by using two different deposition methods. One structure involves all-solution processing, with the photoactive layer spin-coated, and organic semiconductors for the hole and electron transporting layers (HTL and ETL). The other structure incorporates inorgan...

The goal of this work is to study the effect of annealing temperature Ta on the properties of CH3NH3PbI3 (MAPI) thin films deposited on glass substrate through structural, compositional, and optical characterization. The films were obtained by one-step deposition method in which an anti-solvent drip was implemented with some delay during spin coati...

In this work, we study doping-free hybrid heterojunction interfaces based on silicon, poly(3,4-ethylene dioxythiophene)-poly(styrene sulfonate) (PEDOT:PSS) and conjugated polyelectrolyte poly [(9,9-bis(3′-(N, N-dimethylamino) propyl)-2,7-fluorene)-alt-2,7-(9,9–dioctylfluorene) (PFN). For this, three types of hybrid structures were fabricated: a sin...

Colloidal crystal plays a major role in novel optical devices such as waveguides, photonic crystals, and colloidal crystal lasers, among others. It has been known that colloidal crystals may self-assemble due to optical, electric, or chemical potentials, and light-induced thermal effects, such as thermophoresis and convective currents. In this work...

The influence of the composition of silicate glass substrates on the properties of MAPI (CH3NH3PbI3) films with a 1:1:1 % mol ratio of MAI:PbI2:DMSO, deposited by Spin-Coating at 4000 rpm for 30 seconds, was studied. X-ray diffraction suggested the presence of the tetragonal phase and a secondary PbI 2 phase. By SEM and AFM grain sizes between 100...

In this work, we perform drilling of micro-holes and formation of microbubbles in titanium thin films. All these processes occur due the high titanium absorption at near infrared wavelength, the superheating of titanium produce high quality micro-holes which can be create simultaneously with different laser beam spots. Otherwise, when titanium inte...

We present results of theoretical and experimental study of photo-EMF induced by running grating in perovskite thin films, parameters such as electron and hole photoconductivity relaxation time, ambipolar diffusion length, minority carriers drift mobility are obtained.

The detection scheme based on phase detection of SPR response was developed. We show that the proposed biosensing scheme can detect SARS-CoV-2 genetic material with high specificity, low detection limit and short detection time.

In this Letter, we show 3D steady-state trapping and manipulation of vapor bubbles in liquids employing a low-power continuous-wave laser using the Marangoni effect. Light absorption from photodeposited silver nanoparticles on the distal end of a multi-mode optical fiber is used to produce bubbles of different diameters. The thermal effects produce...

Introduction. PECVD enables fabrication of wide range of advanced materials with various structure such as amorphous, polymorphous, nano-crystalline, nanostructured, microcrystalline etc. and with various electronic properties. The latter can be also changed by different dopingl. PECVD silicon materials are commercially employed in multi-layered PV...

The formation of superficial nanostructures (SNs) in reduced indium tin oxide (ITO) thin films by H2-Glow discharge (GD) at a low reduction temperature (Tr=100 °C) was investigated. Sputtered ITO films deposited at low (Td=100 °C) and high (Td=300 °C) temperatures were reduced using this low-temperature process. Scanning electron and atomic force m...

In this work, we present the study of the atomic composition in amorphous SiXGeY:HZ films deposited by radio frequency (RF—13.56 MHz) plasma discharge at low deposition temperature. A study and control of Si and Ge atoms termination using H-dilution in SiGe:H alloys deposited by RF plasma discharge was conducted and we made a comparison with low-fr...

In this work, we propose poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) material to form a hybrid heterojunction with amorphous silicon-based materials for high charge carrier collection at the frontal interface of solar cells. The nanostructural characteristics of PEDOT:PSS layers were modified using post-treatment techniques...

This chapter contains sections titled: Introduction Experimental Material Results Results for Devices Outlook Acknowledgment

Thin-film hybrid organic-inorganic photovoltaic structures based on hydrogenated silicon (Si:H), poly(3,4ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) polymer Al-doped ZnO (AZO) films deposited on different types of flexible substrates have been fabricated and investigated. The compatibility of the polymer and inorganic materials reg...

Hybrid thin film photovoltaic structures, based on hydrogenated silicon (Si:H), organic poly(3-hexythiophene):methano-fullerenephenyl-C61-butyric-acid-methyl-ester (P3HT:PCBM) and poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) films, have been fabricated. Organic semiconductor thin films were deposited by spin-coating techniq...

Indium tin oxide (ITO) thin films were deposited by magnetron sputtering with different oxygen flows rates (%O 2 = 1 % to 0 %). The films were deposited by RF discharge in argon/oxygen atmosphere with a RF power W = 150 W at substrate temperature T = 175° C and pressure P = 6 mTorrs. Photoelectric parameters of fabricated ITO films were characteriz...

We have studied the effect of Ge-concentration in gas phase on electronic properties of Ge X Si Y :H alloys deposited by RF-PECVD. The relative gas phase Ge concentration was varied from [Ge] gas = 50 % to 100 %. The electronic properties of the films were studied by the measurements of temperature dependence of dark conductivity σ dark (T) in the...

Measurements of non-steady-state P-EMF current as a function temporal and spatial modulation frequencies were performed on intrinsic hydrogenated amorphous silicon film at 633 nm wavelength. The experimental behavior of photo-EMF current is well described by a bipolar photoconductivity model. Material photoelectric parameters such as majority carri...

Temperature dependence of DC conductivity σDC(T) of spin-coated poly (3,4 ethylenedioxythiophene):poly(4- styrenesulfonate) (PEDOT:PSS) films has been studied. σDC(T) was measured in films deposited from mixtures of PEDOT/PSS:H2O (1:0.5), PEDOT:PSS (without dilution), PEDOT/PSS:Isopropyl Alcohol (IPA)(1:0.5) and PEDOT/PSS:IPA (1:1). Room temperatur...

Inorganic-organic hybrid solar cells with different frontal interface configurations have been studied. Spin-coated conducting polymer Poly (3,4 ethylenedioxythiophene): poly(4-styrenesulfonate) (PEDOT:PSS) or boron doped a-Si:H films were used as p-type layer. Intrinsic amorphous silicon (a-Si:H) films and P3HT:PCBM heterojunctions were investigat...

We present a device for measuring displacement based on the Talbot and the nonsteady photo-electromotive force effects. The proposed device does not require any numerical signal processing since its output signal is, in appropriate regions, linearly related to the measured displacement. The proposed system requires an illuminating field with a sinu...

We demonstrate that the non-steady-state photoelectromotive force induced by a vibrating Ronchi grating has a very complicated but deterministic dependence on the propagation distance. The characteristic minima of this dependence are found at fractional values of the Talbot distance, and their width is determined by the maximal transversal spatial...

In this work we studied the effect of sensitizer concentration on a mobility-lifetime product μτ, on photoconductivity response time ph τph, and on drift mobility μ of the majority carriers in an organic polymer:sensitizer blend. The intensity modulated photocurrent and photo-EMF technique were used as experimental tools for this purpose. The studi...

Here we examine a new application of the adaptive detectors based on non-steady-state photo-electro-motive force effect for the detection of higher order correlation functions, aiming the estimation of the parameters of ultra short optical pulses arranged in high-repetition trains. For this purpose three beam interferometer scheme with two signal b...

Non-steady-state photoelectromotive force effect in the presence of periodical and linear phase shift was investigated both theoretically and experimentally. It was shown that superposition of oscillating and linear movements of the interference pattern leads to the appearance of the sharp peak in the frequency dependence of the photoelectromotive...

vHere, we consider the possibility of involving the photo-EMF detectors in registration of the parameters peculiar to ultrashort optical pulses, and it is compared whit the recently triple correlator via Direct and Cascade Third Harmonic Generation. Knowledge of triple auto-correlation function, whose Fourier transformation shapes the corresponding...

The detectors based on non-steady-state photo-electromotive force (p-EMF) effect, induced in a photoconductor by an oscillating light pattern, have been proposed recently for localization of self-images generated by a periodical object in real time and without any image processing. Here, we present the detailed theoretical analysis of the p- EMF ef...

We present the experimental study of a new method that uses an adaptive photodetector based on the nonsteady- state photoelectromotive force (photo-EMF) effect for measuring the visibility of the Talbot patterns generated by a Ronchi grating. It was demonstrated that the photo-EMF based detector could be used for efficient localization of planes wi...

We report on a series of near infrared (NIR)-sensitive photorefractive polymer composites (PPCs) based on the hole-conducting polymer PF6-TPD, which are sensitized by soluble fullerene-derivatives as electron-accepting agents. We demonstrate a direct correlation between the electron accepting capability of the sensitizer and the holographic respons...

Organic semiconductors with bipolar (electron and hole) transport capability play a crucial role in electronic and optoelectronic devices such as organic light-emitting diodes (OLEDs), bipolar transistors and photovoltaic cells. Recently, a considerable amount of work has been devoted to the characterization of ambipolar transport in organic materi...

The results on characterization of the main photoelectric properties of the polymer:fulleren based composite material by using the non-steady-state photo-electromotive force (p-EMF) and modulated photocurrent technique are presented. By measuring this current under different experimental conditions, important material photoelectric parameters such...

Talbot self-images localization is important in many optical applications such as interferometry, metrology and nanolithography. Usually, the problem of self-images localization is reduced to the finding the planes of maximal light pattern visibility. There are several conventional techniques that determine the contrast of an intensity distribution...

We present an advanced approach to describing low-power trains of bright picosecond optical dissipative solitary pulses with an internal frequency modulation in practically important case of exploiting semiconductor heterolaser operating in near-infrared range in the active mode-locking regime. In the chosen schematic arrangement, process of the ac...

We discuss specifically elaborated approach for characterizing the train-average parameters of low-power picosecond optical pulses with the frequency chirp, arranged in high-repetition-frequency trains, in both time and frequency domains. This approach had been previously applied to rather important case of pulse generation when a single-mode semic...

Practical feasibility of measuring the train-average parameters of picosecond optical pulses being arranged in highfrequency repetition trains is investigated. For this purpose we consider exploiting the triple auto-correlations, whose Fourier transformations give the bispectrum of a pulse train. The main merit of similar approach consists in the c...

A new class of photo-refractive (PR) composite materials based on poly(N-vinylcarbazole) (PVK) (co-)sensitized with nano-crystalline lithium niobate (LiNbO3) is presented. The steady-state performance, as well as the kinetics of the photo-refractive grating formation, was investigated by degenerate four-wave mixing (DFWM) and two-beam-coupling (TBC...

We make an attempt to develop a novel approach to describing the initial stage of the active mode-locking in semiconductor laser structures based on analyzing the properties of dispersion relations in terms of stability for small initial perturbations. Nonlinear process of shaping optical pulses is interpreted as manifesting instability of diffusio...

The photoconductive properties of a hybrid material based on poly(N-vinylcarbazole) (PVK) doped with nanoparticles of lithium niobate (LiNbO3) have been studied. The experiments were carried out using modulated photocurrent and non-steady-state photo-emf techniques at 633 nm wavelength. The photoconductivity of the composite increases remarkably wi...

Experimental results on detection of vibrations from objects with rough surface using an adaptive detector based on non-steady-state photo-EMF effect in a photoconductive polymer based planar structure are reported.

Adaptive velocimeter based on the ac non-steady state photo-EMF effect induced by oscillating interference pattern has been investigated. The possibility to detect very low velocities (micrometer per second) using photoconductive polymer based detector was demonstrated.

We report on a theoretical model to describe the non-steady-state photoelectromotive-force (photo-EMF) effect in organic photoconductors. Unlike the conventional theory of the photo-EMF effect developed for crystalline materials, this model accounts for the field dependence of the charge generation quantum efficiency and charge carrier mobility. To...

We report on detailed investigation of the photo-electromotive-force (photo-EMF) effect in semiconductor with bipolar photoconductivity of impurity type in a spectral region close to the fundamental absorption edge, where both the photoconductivity and the photo-EMF response reach their maxima. The experiments performed with CdTe:V crystal (ΔE ≈ 1....

We report on the use of a photorefractive polymer composite as the active material for a planar photo- EMF detector suitable for the adaptive detection of optical phase modulated signals in the audio range (10Hz-10KHz). The composite is based on a conjugated triphenyldiamine- phenylenevinylene polymer (TPD-PPV) and is sensitized with a highly solub...

Non-steady-state photoelectromotive-force effect is proposed for experimental measurements of deviation from Einstein relation in amorphous monopolar photoconductors. For widely used poly(N-vinylcarbazole)-based polymer films this technique yielded an approximately three-fold difference between the measured diffusion coefficient-to-mobility ratio (...

Experiments on photo-electromotive-force effect in semi-insulating bipolar CdTe:V in the wavelength range (826-852 nm) close to the crystal fundamental optical absorption show maximal response at /spl ap/840 nm and dynamics governed by the dominating carriers life-time.

An influence of acoustic wave diffraction on the modulation instability of the backward stimulated Brillouin scattering in fibers is numerically investigated, when a small feedback for the Stokes wave is present. The cases of acoustic waveguide and anti-waveguide fibers are considered. It is shown that a presence of acoustic diffraction may expand...

In this paper, we propose relatively simple experimental procedure for measuring the diffusion coefficient D and drift mobility in a single experimental configuration, which can be used for verification of the Einstein relation in amorphous photoconductors. Our method is based on utilisation of the nonsteady state photo-EMF effect excited in the bu...

In this paper, we have shown that by using beating of two photo-emf signals generated by two incoherent patterns, each at oscillating at different frequencies and not at the same spatial frequency and phase modulation amplitude, can be used to determine the frequency components of a vibrating object.

Simultaneous utilization of ac photoelectromotive (photo-EMF) and modulated photocarrier grating (MPG) techniques for characterization of bipolar transport in semi-insulating photorefractive GaAlAs multiple quantum well structure is reported. From the ac photo-EMF experiment the electrons were determined as the dominant photocarriers for interband...

Improvement of the sensitivity of laser-induced ultrasonic detection by GaAs adaptive photoelectromotive force (photo-EMF) devices under external dc bias is reported. The gain in responsivity of the detector about 7× in ≈10 MHz frequency band was observed under application of an external dc field ≈50 V/mm at λ=633  nm . Detailed experiments show th...

We report on simultaneous characterization of space charge gratings in photorefractive PVK-based polymer films by means of photo-EMF and Two-Wave Mixing (TWM) of periodically phase modulated beams. 100 micron thick samples of a polymer DMNPAA:PVK:ECZ:TNF with chromophore (DMNPAA) concentration of 5 wt% were investigated at (lambda) equals 633 nm in...

Summary form only given. Characterization of photorefractive polymer films is a complicated problem because of the dependence of many relevant parameters, such as photocarrier generation rate, their life-time, and diffusion length, on the external field E0. Especially difficult are investigations at low E0 values, where holographic measurements are...

Earlier we investigated the non-steady-state photo-EMF effect in PVK-based photorefractive polymer films in the conventional transmittance tilted configuration [1]. Here we apply this effect and dynamic TWM for the characterization of reflectance gratings in similar polymer films. Note that both experimental configurations utilize periodically phas...

Summary form only given. Due to simplicity and robustness adaptive photodetectors based on the photo-EMF effect are considered promising for various applications, and in particular for laser ultrasonic detection. The most important drawback of these photodetectors is relatively low current response:⩽10-3 A/W for typical GaAs devices with severa...

Results of experimental investigation of the non-steady-state photoelectromotive-force effect in ferroelectric photorefractive Sn 2 P 2 S 6 crystals at a wavelength of 633 nm are reported. The dominating photoconductivity proved to be of the p type, with a diffusion length of photocarriers of ∼1 µm. This characteristic length proved to be shorter t...

Spherically symmetrical reductions of self-dual Yang-Mills and Einstein-Plebanski equations are constructed at the same manner. As in the first case we come back to known before solutions (under such kind of reduction but in some different form) if in the second one we obtain unknown before equation describing the spherically symmetrical configurat...

The photo-electromagnetic field (EMF) effect observed under conventional conditions,demonstrated two characteristic frequencies. The first lower one in the region of several hundred hertz and the higher one in the region of several kilohertz. Position of these characteristic frequencies and intensity dependence of the signal amplitude below and abo...

Summary form only given. It has been shown recently that biaxial ferroelectric crystal Sn₂P₂S₆ (SPS) is a very efficient and fast photorefractive crystal for near-IR spectral region. In particular, for operation wavelength λ=1064 nm it exhibits a gain factor Γ as big as 7 cm^-1. Additionally, the crystal i...

Summary form only given. Non-steady-state photo-EMF induced by the oscillating interference pattern in the volume of the photoconducting sample is intensively investigated now due to its promising applications for adaptive detection of the optical phase modulated signals. Below we present original experimental results on photo-EMF effect in semi-in...

We present experimental results which demonstrate that non-steady-state photo-EMF, induced by vibrating interference fringes in Bi12SiO20 photorefractive crystal can be dramatically (by a factor of 103 in our experimental conditions) enhanced in a resonance regime under application of an external DC field. We show that for increasing applied electr...

The tilted, longitudinal configuration of photo-EMF signal detection for adaptive detection of the optical phase modulation was investigated. Performed with a planar B12SiO20 metal-photoconductor-metal structure, the investigation revealed, at the wavelength of the second harmonic of CW Nd:YAG laser, a first cut-off frequency associated with the di...

Frequency dependences of the nonstationary holographic current in a GaAs sample illuminated by red light (633 nm) were studied experimentally for the 10-Hz–10-MHz frequency range. For light intensities of 1 mW/mm² the space-charge grating is formed with the characteristic time of dielectric relaxation 10 - 7 – 10 - 8 s, and this ensures the excelle...

A microscopic model of the non-steady-state photoelectromotive force excited by a vibrating interference pattern in a bipolar photoconductor under an external dc electric field is elaborated for the case in which the lifetime of one type of carrier is longer than the dielectric relaxation time. It is shown theoretically that when two types of carri...

Summary form only given. Three main configurations are actually used for photorefractive crystal (PRC) based adaptive detection of ultrasound vibrations of real; diffusely scattering objects. They are the scheme with phase-conjugated wave, two-wave mixing configuration, and the configuration based on the nonsteady-state photoelectromotive force (EM...

Non-steady-state photo-EMF observed in short-circuited photorefractive/photoconductive sample illuminated by the vibrating interference pattern (Fig. 1) proved to be promising for many practical interferometric applications and in particular in important kHz frequency range. Up to now this effect was studied quite well in high-frequency approximati...

We show that a photoconductivity relaxation can strongly influence the magnitude of the ac current induced in a bipolar photoconductor by a vibrating pattern of interference fringes. This occurs for low pattern vibration frequencies if the time of the photoconductivity relaxation is much greater than the dielectric relaxation time. The features pre...

Space-charge grating formation and the non-steady-state photoelectromotive force (photoEMF) excited by a vibrating interference pattern are analyzed for the general case of a photorefractive semiconductor with bipolar dark conductivity and photoconductivity. The calculation is performed in the linear approximation of interference pattern contrast w...

We propose estimating the average parameters of ultra short optical pulses with asymmetric envelopes, which are arranged in high-repetition trains. In so doing, one can utilize the advantages of applying the time triple auto-correlations to this problem. The potential advantages of similar, broadly speaking, more complicated auto-correlation functi...