Improved visible-light absorbance of monolayer MoS2 on AlN substrate and its angle-dependent electronic structures

2018 ◽  
Vol 20 (46) ◽  
pp. 29131-29141 ◽  
Author(s):  
Feifei Li ◽  
Changmin Shi ◽  
Dongchao Wang ◽  
Guangliang Cui ◽  
Pinhua Zhang ◽  
...  
Keyword(s):  
Optical Absorption ◽  
Visible Light ◽  
Electronic Structures ◽  
Band Gaps ◽  
Type Ii ◽  
Visible Light Region ◽  
Monolayer Mos2 ◽  
Band Structures ◽  
Light Region ◽  
Light Absorbance

The band gaps of type-II band structures in Mo–N stacking configuration are sensitive to the strains for MoS2/AlN hetero-structures, which exhibit more considerable optical absorption in the visible-light region than MoS2 and AlN monolayers.

THE OPTICAL AND EPR SPECTRA OF THE HYDROGEN ANNEALED KTiOPO4 CRYSTALS

1999 ◽  
Vol 13 (18) ◽  
pp. 645-648 ◽  
Author(s):  
V. A. NAZAROVA ◽  
V. N. EFIMOV ◽  
M. A. LARUHIN
Keyword(s):  
Optical Absorption ◽  
Visible Light ◽  
Epr Spectra ◽  
Hydrogen Treatment ◽  
Visible Light Region ◽  
Light Region

In this work, the results of the hydrogen treatment and following that, the annealing in air of flux-grown KTiOPO 4 (KTP) crystals are represented. We have tried to correlate our optical and EPR results. The main conclusion is that the Ti 3+ A, B, C, D centers are not associated with optical absorption in the visible light region.

Electronic Structure and Optical Properties of ZnO with Antisite Defects

2013 ◽  
Vol 341-342 ◽  
pp. 301-306
Author(s):  
X.J. Xie ◽  
W.H. Wang ◽  
L.Y. Li ◽  
X.G. Luo ◽  
Y.H. Cheng
Keyword(s):  
Optical Properties ◽  
Electronic Structure ◽  
Optical Absorption ◽  
Electronic Structures ◽  
Low Energy ◽  
Visible Light Region ◽  
Optical Absorption Edge ◽  
Light Region ◽  
Level Shifts ◽  
Antisite Defects

We investigate the electronic structures and optical properties of ZnO with antisite defects OZn using the density function pseudopotential method. Our results show that the Fermi level shifts into the conduction band after introducing one or two OZn defects into ZnO supercell, indicating that the system displays a metallic-like characteristic. Moreover, the antisite defects lead to a redshift of the optical absorption edge and obvious optical absorption in the visible light region. Especially, the optical properties are influenced by the configurations of two OZn defects in our considered ZnO supercell. The strongest optical absorption occurs when the two defects are connected by-Zn-O-Zn-bond in the ab plane. These findings are possibly applicable for designing new optoelectronic and photoelectrochemical devices with improved low energy light absorption.

Enhanced Photocatalytic Degradation of Fulvic Acid Using N–Doped SnO2/TiO2 Thin Film Coated Glass Fibers under UV and Solar Light Irradiation for Drinking Water Purification

2016 ◽  
Vol 835 ◽  
pp. 359-365 ◽  
Author(s):  
Peerawas Kongsong ◽  
Lek Sikong ◽  
Sutham Niyomwas ◽  
Vishnu Rachpech
Keyword(s):  
Thin Films ◽  
Optical Absorption ◽  
Visible Light ◽  
Nitrogen Doping ◽  
Glass Fibers ◽  
Band Gap Energy ◽  
Visible Light Region ◽  
Gap Energy ◽  
Light Region ◽  
Degradation Rates

The degradation of fulvic acid (FA) using N–doped SnO2/TiO2 composite thin films coated on glass fibers prepared by sol–gel and dip–coating methods was investigated. The effects of nitrogen doping on coating morphology, physical properties, and FA degradation rates were experimentally determined. Nitrogen doping has an effect on shifting the optical absorption wavelength to visible light region, narrowing the band gap energy and reducing crystallite size which lead to the enhancement of photocatalytic performance. The optimal FA degradation rates of 40N/SnO2/TiO2 composite thin films under UV and solar irradiation are about 2.4 and 2.0 folds higher than that of TiO2 film, respectively due to its narrowest band gap energy (optical absorption wavelength shifting to visible light region) and small crystallite size influenced by nitrogen doped.

scholarly journals Ultrasonic-Assisted Synthesis of 2D α-Fe2O3@g-C3N4 Composite with Excellent Visible Light Photocatalytic Activity

Catalysts ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 457 ◽  
Author(s):  
Huoli Zhang ◽  
Changxin Zhu ◽  
Jianliang Cao ◽  
Qingjie Tang ◽  
Man Li ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Optical Absorption ◽  
Visible Light ◽  
Self Assembly ◽  
Carbon Nitride ◽  
Preparation Method ◽  
Visible Light Region ◽  
Light Region ◽  
Ultrasonic Assisted ◽  
Visible Light Photocatalytic

In this study, α-Fe2O3@g-C3N4 photocatalyst was synthesized using an ultrasonic assisted self-assembly preparation method. The α-Fe2O3@g-C3N4 photocatalyst had a stronger optical absorption in the visible light region than pure graphitic carbon nitride (g-C3N4). The Z-Scheme heterojunction between α-Fe2O3 and g-C3N4 significantly inhibited the recombination of electrons and holes. The photocatalytic performances of α-Fe2O3@g-C3N4 photocatalyst were excellent in degradation of Rhodamine B (RhB) under visible light irradiation. The results indicated that 5 wt.% α-Fe2O3/g-C3N4 had the optimal photocatalytic activity because two-dimension (2D) α-Fe2O3 nanosheets can be well-dispersed on the surface of g-C3N4 layers by ultrasonic assisted treatment. A possible photocatalytic mechanism is also discussed.

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