Modifying the Electronic and Optical Properties of Nano ZnS via Doping With Mn and Fe

Abstract 5% Fe and Mn-doped nano ZnS (Zn0.95A0.05S, A=Fe or Mn) was prepared using the thermolysis technique. The effect of Fe and Mn doping on the lattice parameter, crystallite size, and lattice microstrain was examined applying Rietveld refinement. The analysis showed the incorporation of Fe and Mn substitutionally for Zn ions; a result confirmed by Fourier transforms infrared spectroscopy spectra from the shift in the vibration bands upon doping. The energy of ZnS band gap was reduced by doping, giving ZnS new applications. The different defects inside the different samples were investigated using photoluminescence spectroscopy. The effect of Fe/ Mn doping and incorporation of atmospheric oxygen on the bandgap characteristics, the absorption, optical conductivity, refractive index and the extinction coefficient, reflectance, the real and imaginary parts of the dielectric constant were explored using density function theory calculation (DFT).

Download Full-text

Atmospheric oxygen in Mn doped GaAs/GaAs(001) thin films grown by molecular beam epitaxy

Journal of Crystal Growth ◽

10.1016/j.jcrysgro.2006.11.234 ◽

2007 ◽

Vol 301-302 ◽

pp. 54-57 ◽

Cited By ~ 4

Author(s):

J.F. Xu ◽

P.M. Thibado ◽

C. Awo-Affouda ◽

R. Moore ◽

V.P. LaBella

Keyword(s):

Thin Films ◽

Molecular Beam Epitaxy ◽

Molecular Beam ◽

Atmospheric Oxygen ◽

Mn Doped

Download Full-text

Thermoelectric Properties of Mn Doped Cu12-xMnxSb4S13 Tetrahedrites

Materials Science Forum ◽

10.4028/www.scientific.net/msf.847.161 ◽

2016 ◽

Vol 847 ◽

pp. 161-165 ◽

Cited By ~ 8

Author(s):

Ju Yi Wang ◽

Xiao Ya Li ◽

Ye Feng Bao

Keyword(s):

Electrical Conductivity ◽

Substitution Effect ◽

Hot Press ◽

X Ray Diffraction ◽

Doping Amount ◽

Spectroscopy Analysis ◽

Mn Doping ◽

Thermoelectric Transport Properties ◽

Hot Press Sintering ◽

Mn Doped

In this study, Mn doped Cu12-xMnxSb4S13(x=0, 0.5, 1.0, and 2.0) tetrahedrite samples were prepared by melting and annealing followed by hot press sintering. Powder X-ray diffraction and scanning electron microscopy and electron energy dispersive spectroscopy analysis were performed for the samples, and the thermoelectric transport properties of samples were characterized. The experimental results showed that the synthetic tetrahedrites were consisted of principal Cu12Sb4S13 phase and a small amount of secondary Cu3SbS4 and CuSbS2. The electrical conductivity of the tetrahedrites decreased with increasing the Mn doping amount. Contrary to the electrical conductivity, the Seebeck coefficient of the tetrahedrites increased with increasing Mn doping amount. The thermal conductivity decreased with increasing Mn doping amount due to the suppression of the carrier contribution, as well as due to the substitution effect of Mn on the Cu site. For the Mn doped Cu12-xMnxSb4S13 compounds with x=0.5, 1.0, and 2.0, the ZT values decreased with the increase of Mn doping amount, a maximum ZT=0.89 was obtained for the Mn doped compound with x=0.5.

Download Full-text

Band gap tuning and p to n-type transition in Mn-doped CuO nanostructured thin films

Journal of Semiconductors ◽

10.1088/1674-4926/43/1/012801 ◽

2022 ◽

Vol 43 (1) ◽

pp. 012801

Author(s):

R. Rahaman ◽

M. Sharmin ◽

J. Podder

Keyword(s):

Thin Films ◽

Band Gap ◽

Spray Pyrolysis Technique ◽

Band Gap Energy ◽

Dielectric Constants ◽

X Rays ◽

Electron Effective Mass ◽

Mn Doping ◽

Type Transition ◽

Mn Doped

Abstract Here we discuss the synthesis of copper (II) oxide (CuO) and manganese (Mn)-doped CuO thin films varying with 0 to 8 at% Mn using the spray pyrolysis technique. As-deposited film surfaces comprised of agglomerated spherical nanoparticles and a semi-spongy porous structure for 4 at% Mn doping. Energy dispersive analysis of X-rays confirmed the chemical composition of the films. X-ray diffraction spectra showed a polycrystalline monoclinic structure with the predominance of the ( 11) peak. Optical band gap energy for direct and indirect transitions was estimated in the ranges from 2.67–2.90 eV and 0.11–1.73 eV, respectively. Refractive index and static dielectric constants were computed from the optical spectra. Electrical resistivity of CuO and Mn-doped CuO (Mn:CuO) thin films was found in the range from 10.5 to 28.6 Ω·cm. The tiniest electron effective mass was calculated for 4 at% Mn:CuO thin films. P to n-type transition was observed for 4 at% Mn doping in CuO films. Carrier concentration and mobility were found in the orders of 1017 cm–3 and 10–1 cm2/(V·s), respectively. The Hall coefficient was found to be between 9.9 and 29.8 cm3/C. The above results suggest the suitability of Mn:CuO thin films in optoelectronic applications.

Download Full-text

Anisotropic acoustic phonon polariton-enhanced infrared spectroscopy for single molecule detection

Nanoscale ◽

10.1039/d1nr01701b ◽

2021 ◽

Author(s):

wei Lv ◽

hanchao Teng ◽

chenchen Wu ◽

Xiaotao Zhang ◽

Xiangdong Guo ◽

...

Keyword(s):

Infrared Spectroscopy ◽

Single Molecule ◽

Scanning Probe Microscopy ◽

Acoustic Phonon ◽

Fourier Transforms ◽

High Spatial Resolution ◽

Scanning Probe ◽

Surface Species ◽

Composition And Structure ◽

Fourier Transforms Infrared Spectroscopy

Nanoscale Fourier transforms infrared spectroscopy (nano-FTIR) based on scanning probe microscopy enables identification of chemical composition and structure of surface species with a high spatial resolution (~10 nm), which is...

Download Full-text

Effect of Strain on the Tunability of Highly (100) Oriented Mn-doped Barium Strontium Stannate Titanate Thin Films

MRS Proceedings ◽

10.1557/proc-1034-k10-11 ◽

2007 ◽

Vol 1034 ◽

Author(s):

Shengbo Lu ◽

Ngai Wing Li ◽

Zhengkui Xu

Keyword(s):

Thin Films ◽

Elastic Strain ◽

Lattice Mismatch ◽

Nominal Composition ◽

Mn Doping ◽

Inhomogeneous Strain ◽

Barium Strontium ◽

Strontium Stannate ◽

Tunable Device ◽

Mn Doped

AbstractHighly (100)-oriented Mn-doped barium strontium stannate titanate thin films of a nominal composition (Ba0.7Sr0.3)(Sn0.2Ti0.8-xMnx)O3(Mn-BSSnT) (x=0%, 0.2%, 0.4%, 0.6% and 1%), were fabricated by pulsed laser deposition on (La0.7Sr0.3)O3/LaAlO3substrates. Both elastic strain and inhomogeneous strain were measured by x-ray diffraction techniques. Relationship between the strain and the dielectric properties of the Mn-BSSnT thin films were systematically investigated as a function of the Mn content. Our results show that the tunability is dependent upon not only the elastic strain induced by thermal expansion coefficient and lattice mismatch between the thin film and the substrate but also inhomogeneous strain induced by Mn doping. The tunability decreases with increasing inhomogeneous strain and can be easily manipulated by changing Mn doping content, which is beneficial to real tunable device applications.

Download Full-text

Effect of Ce-Mn Codoping on the Structural, Morphological and Electrical Properties of the BaTiO3 Based Ceramics

Biointerface Research in Applied Chemistry ◽

10.33263/briac114.1221512226 ◽

2021 ◽

Vol 11 (4) ◽

pp. 12215-12226

Keyword(s):

Dielectric Constant ◽

Electrical Properties ◽

Doping Concentration ◽

Xrd Analysis ◽

Solid State Reaction Method ◽

Lattice Parameter ◽

Stoichiometric Ratio ◽

Co Doping ◽

Mn Doped ◽

Co Doped

Undoped, Cerium (Ce) doped, Manganese (Mn) doped and Ce-Mn co-doped Barium Titanate (BaTiO3) with the general formula Ba1-xCexMnyTi1-yO3 (where x = 0.00, 0.01, 0.02, 0.03, y = 0.00; x = 0.00, y =0.01, 0.02, 0.03; and x = y = 0.01, 0.02,0.03) were synthesized by solid-state reaction method and sintered at 1200 C for 4 hr with an aim to study their structural and electrical properties. The grain size of the samples has been estimated using the Scanning Electron Microscopy (SEM). The X-ray Diffraction (XRD) analysis indicates that the structure of the Ce-doped and Ce-Mn co-doped BaTiO3 is cubic. However, the undoped BaTiO3 and Mn-doped BaTiO3 confirmed the tetragonal-cubic mixed phases. With the change of doping concentrations, the positions of different peaks shifted slightly. The lattice parameter varied irregularly with increasing doping concentration because of Mn's changeable valency. EDX spectra confirmed the presence of Ba, Ti, Ce, and Mn contents in the co-doped samples with stoichiometric ratio. Crystallinity is observed to be clearly increased when Ce-Mn is co-doped in BaTiO3. J-V characteristic curves indicate transition from conducting to semiconducting nature for the doped and co-doped samples with the increase in temperature. The dielectric constant of the samples increases up to 4500 with the doping concentration. The higher values of dielectric constant are observed for the 2% Mn-doped and 1% Ce-Mn co-doped samples compared to the other undoped samples. For the undoped and Mn-doped samples, constant dielectric values increase with temperature but decrease for the Ce-doped and Ce-Mn co-doped samples. It is inferred that co-doping of BaTiO3 with Ce and Mn would be beneficial and economical for its applications.

Download Full-text

Ferro-electric and magnetic properties in Bi5Ti3FeO15 films by Mn-doping

Journal of Materials Chemistry C ◽

10.1039/d1tc04383h ◽

2021 ◽

Author(s):

Xue Zhang ◽

Ruijuan Qi ◽

Shangwei Dong ◽

Shuai Yang ◽

Xuekun Hong ◽

...

Keyword(s):

Thin Films ◽

Magnetic Properties ◽

Cell Volume ◽

Unit Cell Volume ◽

Unit Cell ◽

Mn Doping ◽

Electrical And Magnetic Properties ◽

Mn Doped

We investigate the structure and optical, electrical and magnetic properties in Mn-doped Bi5Ti3FeO15 (BTFO) thin films. While Mn-doping does not almost change the structure and unit cell volume of BTFO,...

Download Full-text

Promote doping efficiency and photoluminescence quantum yield of Mn-doped perovskite nanocrystals via two-step hot-injection

Chemical Communications ◽

10.1039/d1cc06219k ◽

2021 ◽

Author(s):

Yacong Li ◽

Chuying Wang ◽

Guangcai Hu ◽

Wen Meng ◽

Shiqi Sui ◽

...

Keyword(s):

Quantum Yield ◽

Ultraviolet Light ◽

Injection Strategy ◽

Mn Doping ◽

Perovskite Nanocrystals ◽

Orange Emission ◽

Photoluminescence Quantum Yield ◽

Bright Orange ◽

Hot Injection ◽

Mn Doped

Manganese doped perovskite nanocrystals (NCs) have been synthesized by a novel two-step hot injection strategy with an unprecedented Mn doping efficiency of 48.5%, bright orange emission under ultraviolet light and...

Download Full-text

Mn-Doped black phosphorene for ultrasensitive hydrogen sulfide detection: periodic DFT calculations

Physical Chemistry Chemical Physics ◽

10.1039/d0cp02013c ◽

2020 ◽

Vol 22 (27) ◽

pp. 15549-15558 ◽

Cited By ~ 4

Author(s):

Mahdi Ghadiri ◽

Mohammad Ghashghaee ◽

Mehdi Ghambarian

Keyword(s):

Hydrogen Sulfide ◽

Dft Calculations ◽

Work Function ◽

Electrical Conductance ◽

Black Phosphorus ◽

Mn Doping ◽

Black Phosphorene ◽

Periodic Dft Calculations ◽

Mn Doped ◽

Periodic Dft

A drastic improvement in both the electrical conductance and work function sensitivities of black phosphorus monolayer to H2S through Mn doping is reported. The operation of the modified nanosensor is more promising than for the pristine material.

Download Full-text