scholarly journals Optical properties of zinc titanate perovskite prepared by reactive RF sputtering

2017 ◽  
Vol 68 (7) ◽  
pp. 10-16 ◽  
Author(s):  
Jarmila Müllerová ◽  
Pavol Šutta ◽  
Rostislav Medlín ◽  
Marie Netrvalová ◽  
Petr Novák
Keyword(s):  
Optical Properties ◽  
Band Gap ◽  
Optical Band Gap ◽  
Rf Sputtering ◽  
Blue Shift ◽  
Optical Transmittance ◽  
Titanium Content ◽  
Zinc Titanate ◽  
Band Gap Engineering ◽  
Photocatalytic Applications

AbstractIn this paper we report results from optical transmittance spectroscopy complemented with data on structure from XRD measurements to determine optical properties of a series of ZnTiO3perovskite thin films deposited on glass by reactive magnetron co-sputtering. The members of the series differ by the titanium content that was revealed as an origin of the changes not only in structure but also in dispersive optical properties. Low porosity has been discovered and calculated using the Bruggeman effective medium approximation. An apparent blue-shift of the optical band gap energies with increasing titanium content was observed. The observed band gap engineering is a good prospective foregoptoelectronic and photocatalytic applications of ZnTiO3.

Blue shift in the optical band gap of amorphous Hf–In–Zn–O thin films deposited by RF sputtering

2012 ◽  
Vol 525 ◽  
pp. 172-174 ◽  
Author(s):  
Anup Thakur ◽  
Se-Jun Kang ◽  
Jae Yoon Baik ◽  
Hanbyeol Yoo ◽  
Ik-Jae Lee ◽  
...  
Keyword(s):  
Thin Films ◽  
Band Gap ◽  
Optical Band Gap ◽  
Rf Sputtering ◽  
Blue Shift

Optical Properties of NiO Thin Films: A Potential Material for Optoelectronic Devices

2012 ◽  
Vol 488-489 ◽  
pp. 103-108 ◽  
Author(s):  
Manisha Tyagi ◽  
Monika Tomar ◽  
Vinay Gupta
Keyword(s):  
Thin Films ◽  
Refractive Index ◽  
Optical Properties ◽  
Substrate Temperature ◽  
Band Gap ◽  
Urbach Energy ◽  
Rf Sputtering ◽  
Blue Shift ◽  
Structural Disorder ◽  
Near Ir

The influence of substrate temperature on the UV-Visible-near-IR optical properties, namely the band gap, the Urbach energy and the refractive index of NiO thin films deposited by RF sputtering has been investigated. The optical band gap of thin films showed the blue-shift in the transmission spectra with increase in the substrate temperature which is related to variation in carrier concentration of the deposited films. Urbach energy (EU) values indicate that the films deposited at 400 oC substrate temperature show least structural disorder. The refractive index of the films is found to decrease continuously with increase in the substrate temperature at all photon energies in the visible and near-IR region, and is attributed to the decreasing packing density of the films. Introduction

Optical Properties and Interface Study of a-Si:H/a-C:H Superlattices

1986 ◽  
Vol 77 ◽  
Author(s):  
Zhang Fangqing ◽  
He Deyan ◽  
Xu Xixiang ◽  
Cui Jinzhong ◽  
Sun Guosheng ◽  
...  
Keyword(s):  
Optical Properties ◽  
Glow Discharge ◽  
Band Gap ◽  
Optical Band Gap ◽  
Blue Shift ◽  
Interface Structure ◽  
Experimental Results ◽  
Interfacial Defects ◽  
Interface Study

ABSTRACTExperimental results on a-Si:H/a-C:H superlattices, including the blue-shift of the optical band gap, the light-induced conductivity effect, the interface structure and the interfacial defects, are presented. Differences between our glow-discharge and sputter-prepared a-Si:H/a-C:H super lat t ices are described.

OPTICAL BAND GAP EXCITATION AND PHOTOELECTRON GENERATION IN TITANIUM DIOXIDE-BASED SOLID STATE SOLAR CELLS

2005 ◽  
Vol 12 (05n06) ◽  
pp. 681-689 ◽  
Author(s):  
M. RUSOP ◽  
T. SHIRATA ◽  
T. SOGA ◽  
T. JIMBO
Keyword(s):  
Titanium Dioxide ◽  
Band Gap ◽  
Optical Band Gap ◽  
Blue Shift ◽  
Optical Transmittance ◽  
Dye Molecules ◽  
Copper Iodide ◽  
Charge Generation ◽  
Efficient Charge ◽  
Wave Range

The properties and optical band gap excitation of nanoporous titanium dioxide ( TiO 2) and transparent semiconducting copper iodide ( CuI ) films prepared by a XeCl excimer laser were investigated. The CuI films exhibited optical transmittance over 80% in the wavelength range from 400 to 900 nm with minimum resistivity of about 2 KΩcm. The optical absorption of these films showed a remarkable blue shift compared to that of polycrystalline of CuI , which can be explained from the formation of ultra fine of CuI grains. The properties of pulsed laser deposited CuI and TiO 2 in power output of p- CuI | dye |n- TiO 2 cells were studied. The photoelectron generation and mechanism in fabricated p- CuI | dye |n- TiO 2 cells were also studied. An efficient charge generation was observed through the illumination of the TiO 2 layer of the fabricated p- CuI | dye |n- TiO 2 cells. The band gap excitation of TiO 2 was observed only under illumination through TiO 2 layer. The adsorbed dye molecules to the TiO 2 surface act as a relay, especially under illumination through TiO 2 layer in the wave range region of 300–400 nm.

Investigation of Annealing on the Structural and Optical Properties of Chemical Bath Deposited ZnSe Quantum Dot Thin Films

2012 ◽  
Vol 229-231 ◽  
pp. 10-13
Author(s):  
Liang Yan Chen ◽  
Chao Fang
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Band Gap ◽  
Optical Band Gap ◽  
Quantum Effect ◽  
Blue Shift ◽  
X Ray Diffraction ◽  
Structural And Optical Properties ◽  
Znse Quantum Dot ◽  
Znse Thin Films

ZnSe thin films were obtained through chemical bath deposition method. Structural and optical properties of as deposited and annealed samples were investigated by X-ray Diffraction and spectrophotometer. The as deposited thin films were in nanocrystalline, with lots of strain and a blue shift of optical band gap. After annealing, the crystal grain gained, the strain eased and optical band gap enlarged. And it suggested that annealing can ease the quantum effect of chemical bath deposited ZnSe thin films.

scholarly journals Role of Bi3+ ions on structural, optical, photoluminescence and electrical performance of Cd0.9-xZn0.1BixS QDs

2021 ◽  
Vol 3 (7) ◽  
Author(s):  
A. Krishnamoorthy ◽  
P. Sakthivel ◽  
I. Devadoss ◽  
V. M. Anitha Rajathi
Keyword(s):  
Band Gap ◽  
Optical Band Gap ◽  
Optical Transmittance ◽  
Electrical Performance ◽  
Chemical Route ◽  
Red Emission ◽  
The Mean ◽  
Cubic Structure ◽  
Cyclic Voltammetry Analysis

AbstractIn this work, the Cd0.9-xZn0.1BixS QDs with different compositions of Bi3+ ions (0 ≤ x ≤ 0.05) were synthesized using a facile chemical route. The prepared QDs were characterized for analyzing the structural, morphological, elemental, optical, band gap, photoluminescence and electrochemical properties. XRD results confirmed that the Cd0.9-xZn0.1BixS QDs have a cubic structure. The mean crystallite size was increased from ~ 2 to ~ 5 nm for the increase of Bi3+ ions concentration. The optical transmittance behavior was decreased with increasing Bi3+ ions. The scanning electron microscope images showed that the prepared QDs possessed agglomerated morphology and the EDAX confirmed the presence of doped elements as per stoichiometry ratio. The optical band gap was slightly blue-shifted for initial substitution (Bi3+  = 1%) of Bi3+ ions and red-shifted for further increase of Bi3+ compositions. The optical band gap was ranged between 3.76 and 4.0 eV. High intense red emission was received for Bi3+ (1%) doped Zn:CdS QDs. The red emission peaks were shifted to a higher wavelength side due to the addition of Bi3+ ions. The PL emission on UV-region was raised for Bi3+ (1%) and it was diminished. Further, a violet (422 nm) and blue (460 nm) emission were received for Bi3+ ions doping. The cyclic voltammetry analysis showed that Bi3+ (0%) possessed better electrical properties than other compositions of Bi3+ ions.

Quantum dots in photocatalytic applications: efficiently enhancing visible light photocatalytic activity by integrating CdO quantum dots as sensitizers

2017 ◽  
Vol 19 (36) ◽  
pp. 24915-24927 ◽  
Author(s):  
A. H. Reshak
Keyword(s):  
Quantum Dots ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Band Gap ◽  
Visible Light Irradiation ◽  
Photocatalytic Performance ◽  
Optical Band Gap ◽  
Visible Light Active ◽  
Photocatalytic Applications ◽  
Visible Light Photocatalytic

The amalgamation of a wide optical band gap photocatalyst with visible-light-active CdO quantum dots (QDs) as sensitizers is one of the most efficient ways to improve photocatalytic performance under visible light irradiation.

Chemical state analysis, optical band gap, and photocatalytic decolorization of cobalt-doped ZnO nanospherical thin films by DC/RF sputtering technique

Optik ◽  
2018 ◽  
Vol 164 ◽  
pp. 143-154 ◽  
Author(s):  
Asim Jilani ◽  
M.Sh. Abdel-wahab ◽  
H.Y. Zahran ◽  
I.S. Yahia ◽  
Attieh A. Al-Ghamdi ◽  
...  
Keyword(s):  
Thin Films ◽  
Band Gap ◽  
Optical Band Gap ◽  
Rf Sputtering ◽  
Chemical State ◽  
Photocatalytic Decolorization ◽  
Doped Zno ◽  
State Analysis
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