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Mariya Aleksandrova Kolev, Georgi Vucheva, Yordanka Pathan, Habib Denishev, Krassimir
Published in
Applied Sciences
In this paper, results from the fabrication and study of a piezoelectric microgenerator using nanobranched zinc oxide (ZnO) film grown on poly(3,4-ethylenedioxythiphene) doped with a sulfonate (PEDOT:PSS)-coated flexible substrate are presented. The aim of the study is to extract information about the electrical behavior of the harvester at differe...
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Kolev, Georgi Mariya Aleksandrova Dobrikov, Georgi Pathan, Habib Fartunkov, Mileti Denishev, Krassimir
Published in
2017 15th International Conference on Electrical Machines, Drives and Power Systems (ELMA)
This work reports about the fabrication of piezoelectric energy harvesting with ZnO nanostructure grown on polymeric based electrode. The piezoelectric film exhibits nanobranched morphology, which provide favorable conditions for dipoles orientation and thus the device is characterized with relatively low dielectric losses in the range of 0.4-3.9×1...
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Mariya Aleksandrova Dobrikov, Georgi Singh, Ajaya K. Videkov, Valentin Kolev, Georgi
Published in
2017 40th International Spring Seminar on Electronics Technology (ISSE)
In this study, novel flexible organic light-emitting diode structure (f-OLED) hybrimer/polymer/metal/polymer/emissive layer/metal was proposed. We studied the effect of the mechanical bending on its electro-optical behavior. The device contains polymeric based anode PEDOT:PSS/Au/PEDOT:PSS, where the conductive polymer was spray deposited on prelimi...
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Mrigal, Asmaa Addou, Mohamed Jouad, Mohamed El Choukri, Noure Elhouda Mariya Aleksandrova
Published in
2017 40th International Spring Seminar on Electronics Technology (ISSE)
In this study, we focus on the growth of thin films of undoped and Sn doped vanadium dioxide thin films deposited by spray pyrolysis on glass substrates. All the samples were grown at a fixed temperature of 450°C for the time duration of 10 min, and the concentration of the precursor solution was fixed at 0.015M. Two different Sn doping concentrati...
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Deo, Soumya R. Singh, Ajaya K. Deshmukh, Lata Mariya Aleksandrova
Published in
Materials Today Proceedings
II-VI group quaternary semiconductor alloy thin films of cadmium zinc sulfoselenide (CdZnSSe) were prepared by chemical bath deposition technique on glass substrates. The deposition was carried out with various optimized deposition parameters such as concentration of precursor ions, deposition temperature, time, pH, etc. In order to obtain homogene...
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Andreev, Svetozar Krastev Bobev, Stefan Rumenov Mariya Aleksandrova Videkov, Valentin Hristov
Published in
2016 XXV International Scientific Conference Electronics (ET)
This article presents the design of non-standard equipment for obtaining experimental data about defects in thin film semiconductor structures. The idea of using low-powered Peltier element programmed to cause small temperature changes in semiconductor structures is scanning of the energy bandgap and thermal stimulation of the trapped charge carrie...
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Mariya Aleksandrova Videkov, Valentin Ivanova, Radost Singh, Ajaya K. Thool, Gautam Sheel
Published in
Materials Letters
The electrical, optical and bending characteristics of poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS)/Au/PEDOT:PSS deposited on polyethylene terephthalate (PET) substrate were studied as a function of inserted Au film thickness. The results were compared with those of indium-tin-oxide (ITO) and single layer PEDOT: PSS electrodes...
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Stoynova, Anna Mariya Aleksandrova Dobrikov, Georgi Bonev, Borislav
Published in
2016 39th International Spring Seminar on Electronics Technology (ISSE)
In this work, variation of the main electrical parameters of flexible organic light-emitting diodes (FOLEDs) is studied as a function of the thermal conditions. Tested structures are consisted of polyethylene terephthalate (PET) as a flexible substrate, indium-tin oxide transparent conductive anodes, polyphenylene vinylene derivative based emissive...
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Vucheva, Yordanka Dilyanova Kolev, Georgi Dobrev Mariya Aleksandrova Denishev, Krassimir Hristov
Published in
Materials Science Forum
This paper presents the results of experimental work on thin piezoelectric polyvinylidene fluoride (PVDF) film, used as active layer in piezoelectric transformer. PVDF film was deposited by spray deposition technique on flexible polyethylene terephthalate (PET) substrate and its thickness was measured to be 2 μm. Aluminum (Al) bottom and top contac...
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Mariya Aleksandrova
Published in
Microelectronics International
Purpose
Purpose This study aims to apply the impedance spectroscopy (IS) for analyzing the electrical behavior and extracting the equivalent circuit of single-layer flexible organic light-emitting diodes (OLEDs) with poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) anode.
Design/methodology/approach
The preliminary ultraviole...
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Mariya Aleksandrova
Published in
Advances in Materials Science and Engineering
Several recent developments in material science and deposition methods for flexible organic light-emitting devices (OLEDs) are surveyed. The commonly used plastic substrates are compared, according to their mechanical, optical, thermal, and chemical properties. Multilayer electrode structures, used as transparent electrodes, replacing conventional ...
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Deo, Soumya R. Singh, Ajaya K. Deshmukh, Lata Singh, Narendra Pratap Mariya Aleksandrova
Published in
Journal of Fluorescence
The thin films of CdS1-xSex were successfully deposited over glass substrates by chemical bath deposition technique. Cadmium acetate, thiourea and sodium selenosulfate were used as source materials for Cd2+, S2− and Se2− ions, while 2-mercaptoethanol was used as capping agent. The various deposition conditions such as precursor concentration, depos...
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Mariya Aleksandrova
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Mariya Aleksandrova Georgi Dobrikov Georgi Kolev
Published in
11th International Conference on “Technical and Physical Problems of Electrical Engineering”At: Bucharest, Romania
Electrical behavior of PEDOT:PSS films was investigated for potential application as anode in ITO-free flexible organic optoelectronic devices. Current-voltage, capacitance-voltage, capacitance-frequency and contact resistance-bending cycles characteristics were measured at different electrodes architecture, as well as with and without post-deposit...
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Mariya Aleksandrova Kurtev, Nikolay Videkov, Valentin Tzanova, Slavka Schintke, Silvia
Published in
Microelectronic Engineering
The mechanical stability of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) films spin coated onto a UV treated PET substrate was investigated. It was found that the UV exposure modifies the PET surface and improves the wetting conditions for PEDOT:PSS films deposition. The adhesion strength of PEDOT:PSS to UV treated PET surfac...
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Mariya Aleksandrova Andreev, Svetozar Kolev, Georgi
Published in
Cogent Engineering
Organic electroluminescent (EL) films of tris(8-hydroxyquinolinato)aluminum (Alq3) mixed with polystyrene (PS) binder were produced by spray deposition. The influence of the substrate temperature on the layer’s morphology and uniformity was investigated. The deposition conditions were optimized and simple flexible light-emitting devices consisting ...
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Georgieva, V Mariya Aleksandrova Stefanov, P Grechnikov, A Gadjanova, V Dilova, T Angelov, Ts
Published in
Journal of Physics Conference Series
A study of NO2 gas sorption ability of thin indium tin oxide (ITO) deposited on 16 MHz quartz crystal microbalance (QCM) is presented. ITO films are grown by RF sputtering of indium/tin target with weight proportion 95:5 in oxygen environment. The ITO films have been characterized by X-ray photoelectron spectroscopy measurements. The ITO surface co...
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Mariya Aleksandrova
Published in
Journal of Physics Conference Series
One of the most studied classes of materials in the modern microelectronic devices are the metal oxides. There are different metal oxide films, such as electrodes, charge injecting and electrochromic coatings for displays or "smart" windows applications. This paper aims to describe the recent achievements for oxide coating deposition for flexible e...
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Kolev, G Mariya Aleksandrova Vucheva, Y Denishev, K
Published in
Journal of Physics Conference Series
In this paper microsensing elements with thin piezoelectric films are presented. Three different materials from the basic types – ceramic, metal oxide and polymer, in microsystems for environment parameters control are used.
Zinc oxide (ZnO) and lead zirconium titanate (PZT) by sputtering technology from hot targets are deposited. The optimal pa...
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Mariya Aleksandrova
Published in
Journal of Coatings
The effect of operational temperature on the electrophysical properties of polymer based electroluminescent structures is examined. For this purpose thin film of light-emitting semiconductor polyphenylenevinylene derivative is deposited between two indium-tin oxide (ITO) electrodes. DC current-voltage (I-V) characteristics of the fabricated devices...
