Effect of cycle numbers on the structural, linear and nonlinear optical properties in Fe2O3 thin films deposited by SILAR method

Erken Ozge 한국물리학회 2022 Current Applied Physics Vol.34 No.-

Fe2O3 thin films were deposited by Successive Ionic Layer Adsorption and Reaction (SILAR) method onto glass substrates at different cycle numbers to investigate structural, linear and nonlinear optical properties. X-Ray Diffraction (XRD) analysis revealed that the Fe2O3 thin films have a non-crystalline nature. The morphological properties of the films were investigated by Field Emission-Scanning Electron Microscopy (FE-SEM) and the results show that the films’ surfaces are porous. The linear and nonlinear optical parameters were evaluated and analyzed by using transmittance and absorbance measurements. For these measurements, UV–Vis spectroscopy at room temperature was used. The refractive index values were calculated in the range of 1.45–3.23 for visible region (400–700 nm). Obtained results reveal that direct optical band gap changed between 2.62 and 2.68 eV and indirect optical band gap changed between 1.67 and 1.77 eV. Additionally, optical electronegativity, optical dielectric constants, surface and volume energy loss functions, nonlinear refractive index, linear optical susceptibility, third-order nonlinear optical susceptibility, optical and electrical conductivity, and loss tangent values were calculated and discussed in detail. It was found that each parameter studied is dependent on the cycle numbers. Also, it can be stated that Fe2O3 thin films are promising candidate for solar cells and optoelectronic device technology.

Controlling of the Optical Properties of the Solutions of the PTCDI-C8 Organic Semiconductor

Erman Erdoğan,Bayram Gündüz 대한금속·재료학회 2016 ELECTRONIC MATERIALS LETTERS Vol.12 No.6

N,N′-Dioctyl-3,4,9,10 perylenedicarboximide (PTCDI-C8) organicsemiconductor have vast applications in solar cells, thermoelectricgenerators, thin film photovoltaics and many other optoelectronicdevices. These applications of the materials are based on their spectraland optical properties. The solutions of the PTCDI-C8 for differentmolarities were prepared and the spectral and optical mesaurementswere analyzed. Effects of the molarities on optical properties wereinvestigated. Vibronic structure has been observed based on theabsorption bands of PTCDI-C8 semiconductor with seven peaks at2.292, 2.451, 2.616, 3.212, 3.851, 4.477 and 4.733 eV. The importantspectral parameteres such as molar/mass extinction coefficients,absorption coefficient of the PTCDI-C8 molecule were calculated. Optical properties such as angle of incidence/refraction, optical bandgap, real and imaginary parts of dielectric constant, loss factor andelectrical susceptibility of the the PTCDI-C8 were obtained. Finally,we discussed these parameters for optoelectronic applications andcompared with related parameters in literature.

Real Time Optical-electrical Characterization of PbTe Thin Film Material for Super-resolution Optical Memory

( Hyun Seok Lee ),( Taek Sung Lee ),( Jeung Hyun Jeong ),( Su Youn Lee ),( Won Mok Kim ),( Byung Ki Cheong ) 대한금속재료학회 ( 구 대한금속학회 ) 2007 ELECTRONIC MATERIALS LETTERS Vol.3 No.1

An experimental study was conducted in an effort to elucidate the origin of the nonlinear optical Properties of PbTe thin film, which previously had been demonstrated to be potentially usable for super-resolution optical memory. Using PbTe thin film device designed expressly for the experiment, transient optical transmittance and reflectance were measured together with the electrical voltage across the PbTe during pulsed irradiation with a 658nm laser of varying power. From the measured data, the absorption coefficient was derived as well as the carrier concentration as a function of laser power, demonstrating vividly that a decrease in the absorption coefficient with increasing laser power is directly related to the increase in photo-generated carriers. The observed correlation underlying the nonlinear optical properties of PbTe may be understood in light of saturable absorption resulting from band filling by carriers photo-generated under thermal influence and is a major cause of the material`s super-resolution effect.

논문 : 정보처리 및 복합기술 ; 광반사를 이용한 한국 논 토양 특성 추정

정선옥 ( S. O Chung ),정기열 ( K. Y. Jung ),( Kenneth A. Sudduth ) 한국농업기계학회 2011 바이오시스템공학 Vol.36 No.1

An optical sensing approach based on diffuse reflectance has shown potential for rapid and reliable on-site estimation of soil properties. Important sensing ranges and the resulting regression models useful for soil property estimation have been reported. In this study, a similar approach was applied to investigate the potential of reflectance sensing in estimating soil properties for Korean paddy fields. Soil cores up to a 65-cm depth were collected from 42 paddy fields representing 14 distinct soil series that account for 74% of the total Korean paddy field area. These were analyzed in the laboratory for several important physical and chemical properties. Using air-dried, sieved soil samples, reflectance data were obtained from 350 to 2500 nm on a 3 nm sampling interval with a laboratory spectrometer. Calibrations were developed using partial least squares (PLS) regression, and wavelength bands important for estimating the measured soil properties were identified. PLS regression provided good estimations of Mg (R2=0.80), Ca (R2=0.77), and total C (R2=0.92); fair estimations of pH, EC, P2O5, K, Na, sand, silt, and clay (R2 = 0.59 to 0.72); and poor estimation of total N. Many wavelengths selected for estimation of the soil properties were identical or similar for multiple soil properties. More important wavelengths were selected in the visible-short NIR range (350-1000 nm) and the long NIR range (1800-2500 nm) than in the intermediate NIR range (1000-1800 nm). These results will be useful for design and application of in-situ close range sensors for paddy field soil properties.

Structural, Optical and Electrical Properties of PVA/PEO/SnO2 New Nanocomposites for Flexible Devices

Aseel Hadi,Ahmed Hashim,Yahya Al-Khafaji 한국전기전자재료학회 2020 Transactions on Electrical and Electronic Material Vol.21 No.3

Fabrication of polyvinyl alcohol (PVA)–polyethylene oxide (PEO) blend doped with tin dioxide (SnO 2 ) nanocomposites has been investigated for flexible electrical and optical applications. The prepared nanocomposites have low cost, lightweight, flexible, high corrosion resistance, good optical and electrical properties. These properties of fabricated nanocomposites make it useful for diff erent optoelectronics applications such as: sensors, solar cells, transistors, diodes, capacitors, energy storage etc. The structural, optical and electrical properties of (PVA–PEO–SnO 2 ) nanocomposites have been studied. The experimental results of optical properties for (PVA–PEO–SnO2) nanocomposites showed that the nanocomposites have higher absorbance in UV region at wavelength range (200–280) nm. This behavior makes the nanocomposites may be used for optoelectronics applications. The absorbance, absorption coeffi cient, extinction coeffi cient, refractive index, real and imaginary dielectric constants and optical conductivity of polymer blend are increased with the increase in SnO2 nanoparticles concentrations while the transmittance and energy band gap are decreased with the increase in SnO2 nanoparticles concentrations. The decrease in energy band gap is useful for diff erent optoelectronics devices industries. Also, the results showed that the dielectric constant and dielectric loss decrease while the conductivity increases with the increase in frequency. The dielectric constant, dielectric loss and conductivity are increased with the increase in SnO2 nanoparticles concentrations. The electrical properties showed that the (PVA–PEO–SnO2) nanocomposites have good dielectric parameters which it may be used for different electronics applications.

Synthesis, Optical and Electrical Studies of Nonlinear Optical Crystal: L-Arginine Semi-oxalate

Vasudevan, P.,Sankar, S.,Jayaraman, D. Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.1

L-Arginine semi-oxalate (LASO) single crystal has been grown by solution growth technique at room temperature. The crystal structure and lattice parameters were determined for the grown crystal by single crystal X-ray diffraction studies. Photoluminescence studies confirm the violet fluorescence emission peak at 395 nm. Optical constants like band gap, refractive index, reflectance, extinction coefficient and electric susceptibility were determined from UV-VIS-NIR spectrum. The dielectric constant, dielectric loss and ac conductivity of the compound were calculated at different temperatures and frequencies to analyze the electrical properties. The solid state parameters such as plasma energy, Penn gap, Fermi energy and polarizability were calculated to analyze second harmonic generation (SHG). Nonlinear optical property was discussed to confirm the SHG efficiency of the grown crystal.

Modifying optical properties of phosphor-in-glass by varying phosphor size and content

Yie, Hoyong,Kim, Sunil,Kim, Yurian,Kim, Hyungsun North-Holland 2017 Journal of non-crystalline solids Vol.463 No.-

<P><B>Abstract</B></P> <P>Phosphor-in-glass (PIG) has been attracting attention as a stable encapsulant for light-emitting diodes. However, the influence of the phosphor size and content on the morphology and optical properties of PIG must be further studied to achieve the desired color properties by understanding the relationship between the phosphor mixing conditions and the morphology. In this study, two different sizes of YAG:Ce<SUP>3+</SUP> phosphors were used in different ratios and total amounts. The optical properties of the PIG samples were measured using an integrating sphere and UV-spectrometer, and cross-sectional scanning electron microscopy images were used to analyze the pore properties. The optical properties of PIG showed linear trends as functions of the pore and phosphor distributions, both of which affect the passage of light. This research shows that the desired color properties can be achieved in PIG by considering the phosphor mixing conditions and the related variations in the morphology.</P>

Synthesis, Optical and Electrical Studies of Nonlinear Optical Crystal: L-Arginine Semi-oxalate

P. Vasudevan,S. Sankar,D. Jayaraman 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.1

L-Arginine semi-oxalate (LASO) single crystal has been grown by solution growth technique at room temperature. The crystal structure and lattice parameters were determined for the grown crystal by single crystal X-ray diffraction studies. Photoluminescence studies confirm the violet fluorescence emission peak at 395 nm. Optical constants like band gap, refractive index, reflectance, extinction coefficient and electric susceptibility were determined from UV-VIS-NIR spectrum. The dielectric constant, dielectric loss and ac conductivity of the compound were calculated at different temperatures and frequencies to analyze the electrical properties. The solid state parameters such as plasma energy, Penn gap, Fermi energy and polarizability were calculated to analyze second harmonic generation (SHG). Nonlinear optical property was discussed to confirm the SHG efficiency of the grown crystal.

광학적 특성과 결합 특성 연구를 통한 CdO-P2O5계 유리의 구조-물성간 상관관계에 대한 추가적인 검증

정재엽 ( Jae Yeop Jung ),김영석 ( Young Seok Kim ),김종환 ( Jong Hwan Kim ),최수연 ( Su Yeon Choi ),김일구 ( Il Gu Kim ),박현준 ( Hyun Joon Park ),류봉기 ( Bong Ki Ryu ) 대한금속재료학회(구 대한금속학회) 2015 대한금속·재료학회지 Vol.53 No.3

In this study, we re-verify the relationship between the structure and properties of cadmium phosphate glasses through the study of the optical and binding properties. We prepared cadmium phosphate glasses with various compositions, given by xCdO-(100-x)P2O5 (x=10-55 mol%), and analyzed their Fourier transform infrared spectra, X-ray photoelectron spectroscopy, optical band gap and other properties such as dissolution rate, thermal expansion coefficient, glass transition temperature, glass softening temperature. We found that the optical band gap and glass transition temperature decreased and thermal expansion coefficient increased with increasing CdO content. These results suggest that CdO acts as a network modifier in binary phosphate glass and weakens its structure. Futher, we found that the chemical durability and optical band gap is rapidly changed when the CdO content is more than 40 mol%. From these results, we can deduce that ionic bonding increases and covalent bonding decreases when the CdO content is more than 40 mol%.(Received Mary 16, 2014)

마이크로파 수열합성법을 이용한 알루미늄이 도핑된 산화아연 합성 및 그 광학적 특성

현미호(Hyun, Mi-Ho),강국현(Kang, Kuk-Hyoun),이동규(Lee, Dong-Kyu) 한국산학기술학회 2015 한국산학기술학회논문지 Vol.16 No.2

금속 산화물 반도체는 독특한 전기·광학적 특성, 높은 표면적 등으로 인해 태양전지, 센서, 광소자 및 디스플레이 등 여러 분야에 걸쳐 응용되고 있다. 금속 산화물 가운데 우수한 물리·화학적 특성을 가지는 산화아연은 3.37 eV의 넓은 밴드 갭 에너지와 60 meV의 큰 엑시톤 결합에너지를 갖는 n-형 반도체로서 산화아연에 양이온을 도핑하여 전기·광학적 특성을 보완하는 연구가 진행되고 있다. 본 연구는 알루미늄이 도핑 된 산화아연을 마이크로파 수열합성법으로 합성하였다. 전구체 의 종류와 몰 비 등의 반응 변수를 조절하여 최적의 결정형상과 광학적 특성을 갖는 산화아연을 합성하였으며, 알루미늄을 도핑하여 광학적 특성 변화를 시도하였다. 합성된 입자는 SEM, XRD, PL, UV-Vis 분광기 및 EDS 등의 기기분석을 통해 광학적, 물리·화학적 특성을 확인하였다. Metal oxide semiconductors have been applied in several areas, such as solar cells, sensor, optical elements and displays, due to the high surface area, unique electrical and optical characteristics. Zinc oxide among the metal oxide has excellent physicochemical properties. Zinc oxide is a n-type semiconductor with a wide direct transition band gap of 3.37 eV at room temperature and large exciton binding energy of 60 meV. Cation-doped zinc oxide studies were conducted to complement the electrical and optical characteristics. In this paper, Al-doped ZnO was synthesized by hydrothermal synthesis using microwaves. ZnO was synthesized by adjusting the precursor ratio and using different dopants. The optimal ZnO synthesis conditions for crystal shape and optical properties were determined. The optical properties of aluminum doped zinc oxide were then examined by SEM, XRD, PL, UV-vis absorbance spectrum, and EDS.