http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Photoluminescence and Magneto-optical Properties of Zn1−xMnxO
율다세프,강태원,Vasiliy O. Pelenovich,Uygun V. Valiev 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.3
Zn1−xMnxO thin films on quartz substrates with a low concentration of Mn (1%) were prepared by using ultrasonic spray pyrolysis. Photoluminescence, optical absorption, and magnetic circular dichroism (MCD) measurements were conducted in order to study the optical and the magnetic properties of Zn0.99Mn0.01O. The free exciton lines are dominant in the spectra of these samples, which indicates a high crystal quality for the films. Magneto-optical measurements show a significant MCD at the band edge of Zn0.99Mn0.01O at room temperature.
Study of the Magnetic Phase Transition in ZnMnO by Using Specific Heat Capacity Measurements
율다세프,Shavkat U. Yuldashev,강태원,Vasiliy O. Pelenovich 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.3
The magnetic phase transition in diluted magnetic semiconductor Zn1−xMnxO was studied by using a specific heat capacity method. Zn1−xMnxO (x = 0.05) thin films were prepared by using ultrasonic spray pyrolysis. The films were additionally doped by nitrogen in order to obtain a ptype conductivity. The magnetization (M-H) measurements, obtained by using a SQUID showed a hysteresis loop at low temperatures, which demonstrated the existence of ferromagnetic ordering in these samples. The temperature dependence of the specific heat capacity (Cp), measured without an external magnetic field, revealed a pronounced λ-shaped peak at 75 K. Such a Cp dependence indicates a well-defined second-order magnetic phase transition in the nitrogen-doped Zn0.95Mn0.05O samples.
Study of the Thermal Conductivity of ZnO Nanowires/PMMA Composites
쿠산,율다세프,조학동,강태원,Shahzoda Rakhimova,Tursunboy Akhmedov 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.10
From thermal conductivity measurements on ZnO nanowires (NWs)/poly(methyl methacrylate) PMMA composites, the thermal conductivities of the ZnO nanowires were determined. The thermal conductivity of a ZnO NW decreases considerably with decreasing nanowire diameter, and for a ZnO nanowire with a diameter of 250 nm, the thermal conductivity at room temperature is approximately two times lower than that of bulk ZnO at the same temperature. The results of this study show that the thermal conductivity of a ZnO NW is mainly determined by increased phonon-surface boundary scattering. These results could be useful for the design of ZnO-nanowire-based devices.
Electrical and Photoelectrical Characteristics of the ZnO/Organic Hybrid Heterostructure
자키로브,율다세프,이재춘,강태원,조학동 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.21
The characteristics of the p-n heterojunction between vertically aligned ZnO nanowires and a Poly(3,4-ethylenedioxythiophene) doped with poly(4-styrenesulfonate) (PEDOT:PSS) thin film were investigated. The current-voltage characteristics of the structures had a very good rectifying diode-like behavior with a leakage current less than 5.39 × 10^(−7) A at -2 V, a breakdown voltage greater than 10 V, and a forward turn-on voltage of 1 V. In addition, the effects of ultraviolet (UV)illumination and temperature on the I-V characteristics of the ZnO/PEDOT:PSS configuration were also investigated. The photoelectric measurements demonstrated that the photodiode had a high sensitivity and selectivity to UV light.
Functional Hybrid Materials Derived from Natural Cellulose
자키로브,율다세프,조학동,이재춘,강태원,Jonibek Khamdamov,Abdugafur Mamadalimov 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.10
In this paper, we report a study on the optical and the electrical properties of pure cotton fibers (CF) from chemically surface- and morphology-modified samples coated with poly [2-methoxy-5-(2-ethylhexyloxy)-1, 4-phenylenevinylene] (MEH-PPV) polymer by using a dip-coating method. The properties of the treated and coated fibers were characterized by using scanning electron microscopy (SEM), luminescence and I-V characteristics. The performance of fibers with MEH-PPV polymer as a coating component was investigated, and an excellent white-light emission that consisted of blue-, green-, and red-light-emitting bands was demonstrated. The I-V characteristics of sandwich-type devices consisting of successive layers of ITO (Indium doped tin oxide coated glass)-PEDOT-PSS (Poly(3,4-ethylenedioxythiophene)-Poly(styrenesulfonate)-CF/MEH-PPV-Ag showed that upon light illumination, the current increased in both the forward and the reverse bias conditions which suggest that the photoresponse parameters for the heterojunction are better than they are for the composite alone.
얄리셰프,율다세프,Ziyodbek A. Yunusov,강태원 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.68 No.3
The response of the near-band-edge photoluminescence (PL) emission of ZnO thin films to annealing and the electric field’s action was investigated. These processes separately caused similar changes in the PL spectrum. The donor bound exciton emission at 3.36 eV, which is attributed to bulk defects, demonstrated invariance to any exposure, while the intensity of the 3.33-eV emission line decreased after annealing in nitrogen gas and was restored after annealing in an oxygen atmosphere. On the other hand, application of an electrical field during laser illumination resulted in the same change in the PL spectrum. The transition of defects related to the 3.33-eV emission from a radiative to a non-radiative state (and inversely) through the capture (release) of electrons was proposed as the mechanism responsible for the observed changes in the optical properties. The desorption of oxygen from the surface of the ZnO film during annealing in N2 or the motion of photogenerated electrons toward the surface during laser illumination were suggested to be the cause of this capture process.
이동진,전희창,율다세프,강태원,류성룡,손문아,박지원,우용득 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.2
Self-assembled, one dimensional (1-D) Zn1−xCdxS nanostructures with a Cd composition ofx = 0.11 have been successfully fabricated on indium-tin-oxide/glass substrates by using a coevaporationmethod in the absence of any catalyst. The structures and the morphologies of thesenanostructures were studied using X-ray diffraction and high-resolution transmission electron microscopy. X-ray photoelectron spectroscopy confirmed that the Cd ions occupied the Zn sites in theZnCdS nanowire. The fabricated ZnCdS nanostructures exhibited various shapes, such as hexagonalnanorods (H-NRs), cylindrical nanorods (C-NRs), nanoneedles (NNs), nanowires (NWs) andnanodumbbells (NDs), for different substrate temperatures. Increasing the substrate temperatureresulted in the formation of nanostructures with smaller diameters. The shape-controllable growthof ZnCdS 1-D nanostructures might result in the development of a high-efficiency nano-solar cell.
Electrical and Optical Properties of Air-stable, Iodine-doped Natural Cotton Fibers
A. S. Zakirov,율다세프,조학동,전희창,강태원,A. T. Mamadalimov 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.4
The influence of sodium-hydroxide treatment and iodine doping on the optical and the electricalproperties of cotton fibers is investigated by using photoluminescence (PL), as well as photoconductivity,measurements. The iodine doping results in a quenching of the PL and an enhancement ofthe photoconductivity due to the photo-induced charge transfer between the dopants and the cottonfibers. The conductivity of the iodine-doped cellulose fibers shows a significant enhancement bymore than five orders of magnitude as compared to that of the undoped samples. A good correlationis found between the changes in the fiber’s morphology and the electrical and optical properties ofthe fiber, which opens interesting perspectives for molecular donor-acceptor device applications.
Influence of MnO Clusters on Resistance Switching Behaviors in ZnO/n-Si Structures
얄리셰프,김연수,박배호,율다세프 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.10
Polycrystalline ZnO and ZnO:Mn (5%) films deposited on n-type Si substrates were investigated. The bias polarity dependence of the resistance change and its long retention in Mn-doped ZnO films was observed. The resistance switching could be explained by the trapping/extracting of charge carriers in the ZnO:Mn/n-Si interlayer containing MnO clusters. Under illumination, the ZnO:Mn/n-Si structure exhibited a decreased threshold voltage for switching from a high-resistance state to a low- resistance state.
Influence of Mn-oxide Nanoclusters on the Electric Properties of ZnO:Mn Films
Vadim Sh. Yalishev,홍사환,박배호,V. Pelenovich,율다세프 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.1
Polycrystalline ZnO:Mn films have been deposited on Si substrates by using ultrasonic spray pyrolysis methods. ZnO:Mn (3%) films show hysteretic behaviors in the I-V curves and these behaviors are related to charging and discharging of Mn-oxide nanoclusters. The conditions for hysteresis to appear depend on the sizes of the formed Mn-oxide nanoclusters close to the electrode interfaces.