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Optical band gap
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A new multispectral InGaZnO (IGZO) thin-film phototransistor (TF PT) based on a graded band-gap (GBG) SiGe capping layer with metallic nanoparticles (MNPs) is proposed. An accurate drain-current model is developed to investigate the device performances, where the optical characteristics under different light excitations (530 nm, 820 nm, and 1550 nm) are analyzed using the 3-D Finite-difference time-domain method (FDTD).
11p
viberbers
09-08-2023
9
3
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Results of this investigation have been correlated with the films structural and optical properties. Among the structural properties, surface roughness and morphology, and crystalline quality of the films have been obtained by using the XRD and AFM methods. Additionally, optical properties such as band gap tune-ability and dielectric constant have been determined by spectroscopic ellipsometer.
7p
viberbers
09-08-2023
4
3
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These results gave an insight into the phase transformation and implied a simple method for manipulating the crystal phase and morphology of tungsten oxide nanostructures for various applications.
12p
vispiderman
15-06-2023
3
2
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The study explores the mechanical, optoelectrical and photocatalytic properties of GeS and SnS structures by Density Function Theory (DFT) through Quantum Espresso software. The results show that the GeS and SnS structures are the semiconductor materials at equilibrium with band gaps of 1.75 eV and 1.4 eV, respectively.
8p
vihawkeye
26-05-2023
8
2
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Mixed-phased Inx Sey thin film containing InSe, In2 Se3 and In6 Se7 phases was prepared by M-CBD method and characterized by X-ray diffraction, AFM, optical spectroscopy and J-V measurements. Structural, optical and electrical conductance properties were modified by annealing the films at different temperatures. Optical and morphological properties were also investigated dependently on temperature and concentration of cationic precursor solution.
13p
langthannam
29-12-2021
12
0
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ZnO:Ni powders are prepared by forced hydrolysis method. The samples were investigated by using XRD, SEM and photoluminescence (PL) spectra. The intensity of near band gap photoluminescence as a function of doping concentration and temperature was studied. The researching results show the doping concentration of Ni strongly affected the luminescence in the UV spectral region and reveal application potential of ZnO:Ni material in optoelectronic and magneto-optical devices of UV range.
6p
thienlangso
15-12-2021
13
0
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A novel alkoxy-bridged dithieno (3, 2-B:2’,3’-D) pyrrole (DTP) derivative was synthesized and its corresponding polymer poly(1,2-bis(2-(4H-dithieno[3,2-b:2’,3’-d]pyrrol-4-yl)ethoxy)ethane) (P(DTP-alkoxy-DTP)) was successfully obtained electrochemically. The effects of alkoxy bridge in the structure on the electrochemical and spectroelectrochemical properties of the polymer were also investigated in detail. The results showed that the polymer film exhibits multielectrochromic behavior and a low band gap of 1.82 eV.
10p
tudichquannguyet
29-11-2021
11
1
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In the present study, two new donor–acceptor–donor-type molecules were synthesized and the electro-optical properties of the resulting monomers and their corresponding polymers were investigated. Thiophene was selected as the donor unit and cycloheptyl- and cyclooctyl- substituted benzimidazoles were used as the acceptor units. The synthesized monomers and their electrochemically obtained polymers were characterized using cyclic voltammetry and UV-Vis spectrometry. The optical band gap values of the polymers were 1.
11p
tudichquannguyet
29-11-2021
12
1
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In this paper, the band gap as well as other electronic properties of Cu2HgGe(S1- xSex)4 was for the first time studied by HSE06 method [25]. Despite the fact that HSE06 method usually un- derestimates the band gap of semiconductor, it can give good prediction optical properties [22, 26].
9p
nguaconbaynhay11
07-04-2021
9
1
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Upon completion of this course, the student will learn: Understanding of the concept of band gap in semiconductors, to distinguish direct and indirect band gap semiconductors, and to relate the band gap with the wavelength of optical absorption and emission, understanding of doping of semiconductors to determine the free carrier concentration, knowledge of the formation of p-n junctions to explain the diode operation and to draw its I-V characteristics.
43p
larachdumlanat126
31-12-2020
26
2
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This indicates that the Ce ion has an effect on the structure of ZnWO4 and suggests a solubility limit of Ce in ZnWO4 ceramics. In addition, we also calculated the Raman active modes by using group theory and we received 18 modes in Raman active and 16 modes in IR active. The absorption measurement indicates the band gap of ZnWO4 decreases with increasing Y content. The reasons for the above changes are discussed in this presentation.
5p
tamynhan8
04-11-2020
6
1
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Borotellurite glasses were prepared by melt quenching technique. Amorphous nature of samples was confirmed through X-ray diffraction (XRD) patterns. Effect of B2O3 content on the structure of glass network was studied through Fourier-transform infrared spectroscopy (FTIR) spectra. Optical band gap and Urbach energy were found from analysis of optical absorption spectra. Thermal studies were carried out by using Differential thermal analyzer (DTA) measurements.
8p
tamynhan6
14-09-2020
11
1
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The maximum ionic conductivity of 5.39 108 Scm1 at 303 K was observed for the 5 mol VO2 ions doped PVP polymer electrolyte film. From the UV-Visible absorption spectra in the wavelength range of 200-800 nm the direct and indirect optical energy band gaps and optical absorption edges were found decreased with the increase in the VO2 ion concentration.
7p
tamynhan4
06-09-2020
11
1
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In the present work, Co impurities were introduced to host NBTO materials through the sol-gel method. Results demonstrated the reduction in the optical band gap of pure and Co-doped NBTO, and that the observed room temperature ferromagnetism in Co-doped NBTO materials originates as an intrinsic phenomenon.
7p
tamynhan4
06-09-2020
10
1
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It has been reported in literature that studies have been conducted on electrical conductivity and dielectric properties of polymer blends with regard to storage and dissipation of electric and magnetic energies. These materials reveal numerous phenomena in optics, electronics and solid state physics.
9p
tamynhan4
06-09-2020
13
2
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Pirochromite (MgCr2O4) nanoparticles were successfully prepared in this study. During synthesis of the pirochromite nanoparticles, a sol-gel was prepared by using magnesium acetate and potassium dichromate as magnesium and chromium sources and by using stearic acid as the network.
8p
tocectocec
25-05-2020
3
0
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A solid acid membranes based on poly (vinyl alcohol) (PVA), sodium bromide (NaBr) and phosphoric acid (H3PO4) were prepared by a solution casting method. The morphological, IR, electrical and optical properties of the (PVA)0.7(NaBr)0.3(H3PO4)xM solid acid membranes where x = 0.00, 0.85, 1.7, 3.4, 5.1 M were investigated. The variation of film morphology was examined by scanning electron microscopy (SEM) studies. FTIR spectroscopy has been used to characterize the structure of polymer and confirms the complexation of phosphoric acid with host polymeric matrix.
7p
kethamoi1
17-11-2019
17
0
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Layers of ethylene carbonate (EC) modified CuI/PVA polymer composites were prepared by growth of CuI nano-particles in an aqueous solution of PVA followed by casting at room temperature. The structural, thermal, optical, electrical and di-electrical characterization of polymer composites was investigated using different techniques. These investigations confirm the growth of CuI nano-particles and reduction of PVA crystallinity by increasing ethylene carbonate concentration.
8p
kethamoi1
17-11-2019
15
0
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Polyaniline–NiFe2O4 nanocomposites (PANI–NiFe2O4) with different contents of NiFe2O4 (2.5, 5 and 50 wt%) were prepared via in situ chemical oxidation polymerization, while the nanoparticles nickel ferrite were synthesized by sol–gel method. The prepared samples were characterized using some techniques such as Fourier transforms infrared (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). Moreover, the electrical conductivity and optical properties of the nanocomposites were investigated. Pure (PANI) and the composites containing 2.
8p
trinhthamhodang1
16-11-2019
17
0
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In this work we report a hydrothermal approach for synthesis of zinc stannate (Zn2SnO4) nanocrystals. Our research focused on the effect of the molar ratio of initial chemicals, reaction temperature and reaction duration on the phase composition and the fluorescence properties. Structural and optical properties of the final products were investigated in detail. X-ray diffraction analysis indicated that the Zn2SnO4 nanocrystals possess face-centered cubic crystal structure. Raman scattering spectra exhibit two characteristic vibrational modes of Zn2SnO4 crystals.
13p
thuyliebe
09-10-2018
49
1
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