Optical studies of InAs/GaAs quantum dot stacks for photovoltaic applications

Yang, Jie; Reddy, M. V.

doi:10.56053/5.2.137

Cited by 5 publications

(4 citation statements)

References 23 publications

(28 reference statements)

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“…The elastic calculations were considered over a single unit cell (1 × 1 × 1 supercell), and were computed with five deformations per non-equivalent axis and a maximum deformation size of 0.33 in percent and degrees. Atomic relaxation was carried out for each individual deformation [9,10].…”

Section: Computationalmentioning

confidence: 99%

Structural and thermal properties of H6Ta2O17

Kojal

Javec

2023

ETN

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The structural, electronic, mechanical, and thermal properties of H6Ta2O17 are studied using density functional theory. The Helmholtz free energy is computed for various symmetry constraints on the H6Ta2O17 structure during lattice structure optimization and atomic configuration relax- ation. The Helmholtz free energies calculated from Γ-point phonon frequencies demonstrate a pref- erence for slightly lowered symmetry, preferring triclinic symmetry rather than the experimentally determined orthorhombic symmetry. Elastic constants are obtained for the symmetry-enforced (i.e., orthorhombic) structure and are used to calculate the structure’s mechanical and thermal properties including its bulk, shear, and Young’s moduli, Poisson ratio, Pugh ratio, longitudinal and shear sound velocities, and Debye temperature. Using the Born criteria, the symmetry-enforced structure is shown to be mechanically stable. The electronic band structure for H6Ta2O17 is pre- sented and found to exhibit a large indirect band gap.

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Section: Computationalmentioning

confidence: 99%

Structural and thermal properties of H6Ta2O17

Kojal

Javec

2023

ETN

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“…Kien, T.T. et al [17] evaluated the chemical properties, elemental composition, benefits and applications of fly ash material. They came into conclusion that geopolymer concrete provides many advantages such as high strength, excellent corrosion resistance and low CO2 emission.…”

Section: Introductionmentioning

confidence: 99%

Approach to fly in roadbed cobnstrction

Papagelis¹,

Pumera²,

Simos³

2023

ETN

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Nowadays, filling sand is mainly used for roadbed construction. However, this material resource is gradually depleting. At the same time, sand has loose grain structure and small elastic modulus (E ≤ 40Mpa) therefore it fails to meet the technical requirements of roadbed construction. Consequently, roadbed is often embanked with alternative materials such as soil reinforced with inorganic binders, natural aggregates, and macadam. leading to high cost and environmental pollution. Therefore, it is important to determine a new type of roadbed material. This study presents several laboratory tests on the mechanical and physical properties of sand mixed with fly ash in order to find an appropriate mixture for roadbed construction. The test results show that the mixture of sand and fly ash, which contains an optimal ratio of sand/fly ash of 70%/30% with a dry volume value of 1.821g/cm³, not only meets the requirements for roadbed materials, but also utilizes more fly ash. When adopting Geopolymer technology where alkaline solution is added to reinforce sand-fly ash mixture with the ratio of sand/fly ash of 70%/30%, fly ash will be activated by the alkaline solution to produce gelatinous material through a series of reactions. The gelatinous material is characterized by the high-strength and the tightly-linked molecules. Apart from being a suitable material for roadbed construction, sand fly ash material can also be used as a foundation layer for pavement structure

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“…Doped ZnO plays important role in wide range of applications such as micro-electro-mechanical systems (MEMS) due to their good piezoelectric effect [17][18][19], transparent conducting electrodes in some devices due to their good electrical conductivity [20], light emitting diodes, UV lasers, transparent field effect transistors, solar cells and other optical coating applications [21]. Many techniques have been used to deposit undoped ZnO and B-doped ZnO thin films, such as chemical vapor deposition [22,23], magnetron sputtering [16,24], pulse laser deposition [25,26], electrochemical deposition [27], and the sol-gel technique [15,28]. In this paper, undoped ZnO and B-doped ZnO thin films have been dip coated on glass substrates via sol gel techniques.…”

Section: Introductionmentioning

confidence: 99%

Optical Characterization of Boron-doped ZnO nanostructures

Al-Ahmad

Qasabi

2022

ETN

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Zinc oxide and Boron-doped zinc oxide (B-ZnO) thin films have been dip coated on glass substrates using Sol-Gel technique. The ZnO solution was prepared by using zinc acetate dihydrate (ZAD) as starting material. Ethanol and citric acid are used in the Sol-Gel process as solvent and solution stabilizer, respectively. Doping of boron is achieved by adding a proper molar ratio of Boric acid (H3BO3) solution to the final ZnO solvent. The optical properties of thin films were investigated using UV-vis spectrophotometer measurements. Transmittance of undoped ZnO films exhibits high values that are decreasing upon increasing the Boron concentration. We found that the index of refraction of undoped ZnO films demonstrates values ranging between 1.6 and 2.2 and increase as B concentration is increased and approximately match those of bulk ZnO. In addition, structural properties were investigated using XRD, SEM and EDAX techniques. Upon annealing, we found that the films exhibit a hexagonal structure and as B concentration increases the grain size increases and the strain decreases. Our results indicate that (B-ZnO) films could be used as seeded platforms for growing nanostructures using hydrothermal method.

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Optical studies of InAs/GaAs quantum dot stacks for photovoltaic applications

Cited by 5 publications

References 23 publications

Structural and thermal properties of H6Ta2O17

Structural and thermal properties of H6Ta2O17

Approach to fly in roadbed cobnstrction

Optical Characterization of Boron-doped ZnO nanostructures

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