scholarly journals Spatially Resolved Optoelectronic Properties of Al-Doped Zinc Oxide Thin Films Deposited by Radio-Frequency Magnetron Plasma Sputtering Without Substrate Heating

Nanomaterials ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 14 ◽  
Author(s):  
Eugen Stamate
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Zinc Oxide ◽  
Spatial Resolution ◽  
Negative Ions ◽  
Negative Ion ◽  
Soda Lime Glass ◽  
Plasma Parameters ◽  
Film Properties ◽  
Substrate Heating

Transparent and conducting thin films were deposited on soda lime glass by RF magnetron sputtering without intentional substrate heating using an aluminum doped zinc oxide target of 2 inch in diameter. The sheet resistance, film thickness, resistivity, averaged transmittance and energy band gaps were measured with 2 mm spatial resolution for different target-to-substrate distances, discharge pressures and powers. Hall mobility, carrier concentration, SEM and XRD were performed with a 3 mm spatial resolution. The results reveal a very narrow range of parameters that can lead to reasonable resistivity values while the transmittance is much less sensitive and less correlated with the already well-documented negative effects caused by a higher concentration of oxygen negative ions and atomic oxygen at the erosion tracks. A possible route to improve the thin film properties requires the need to reduce the oxygen negative ion energy and investigate the growth mechanism in correlation with spatial distribution of thin film properties and plasma parameters.

Physical Characterization of Zirconium Doped Zinc Oxide Thin Firms Deposited by Spray Pyrolysis

1998 ◽  
Vol 520 ◽  
Author(s):  
A. Maldonado ◽  
D.R. Acosta ◽  
M. De La Luz Olvera ◽  
R. Castanedo ◽  
G. Torres ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Zinc Oxide ◽  
Spray Pyrolysis ◽  
Doping Concentration ◽  
Film Properties ◽  
Preferential Growth ◽  
X Ray ◽  
Substrate Temperatures

ABSTRACTZinc oxide thin films doped with zirconium were prepared from solutions with doping material dispersed at several concentrations and using the spray pyrolysis technique.The films were deposited over sodocalcic glasses at different substrate temperatures. Effects of doping material concentration and substrate temperatures on electrical, optical, structural and morphological film properties are presented. Results show an evolution in morphology and grains size as the doping concentration is increased. Preferential growth in the (002) orientation was detected for each thin film from X ray diffractograms.

scholarly journals Optical Properties of Magnesium-Zinc Oxide for Thin Film Photovoltaics

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5649
Author(s):  
Mohammed A. Razooqi Alaani ◽  
Prakash Koirala ◽  
Adam B. Phillips ◽  
Geethika K. Liyanage ◽  
Rasha A. Awni ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Zinc Oxide ◽  
Quadratic Function ◽  
Alloy System ◽  
Soda Lime Glass ◽  
Magnesium Zinc Oxide ◽  
Wurtzite Phase ◽  
Minimum Concentration ◽  
Thin Film Photovoltaics

Motivated by their utility in CdTe-based thin film photovoltaics (PV) devices, an investigation of thin films of the magnesium-zinc oxide (MgxZn1−xO or MZO) alloy system was undertaken applying spectroscopic ellipsometry (SE). Dominant wurtzite phase MZO thin films with Mg contents in the range 0 ≤ x ≤ 0.42 were deposited on room temperature soda lime glass (SLG) substrates by magnetron co-sputtering of MgO and ZnO targets followed by annealing. The complex dielectric functions ε of these films were determined and parameterized over the photon energy range from 0.73 to 6.5 eV using an analytical model consisting of two critical point (CP) oscillators. The CP parameters in this model are expressed as polynomial functions of the best fitting lowest CP energy or bandgap E0 = Eg, which in turn is a quadratic function of x. As functions of x, both the lowest energy CP broadening and the Urbach parameter show minima for x ~ 0.3, which corresponds to a bandgap of 3.65 eV. As a result, it is concluded that for this composition and bandgap, the MZO exhibits either a minimum concentration of defects in the bulk of the crystallites or a maximum in the grain size, an observation consistent with measured X-ray diffraction line broadenings. The parametric expression for ε developed here is expected to be useful in future mapping and through-the-glass SE analyses of partial and complete PV device structures incorporating MZO.

scholarly journals Detection of nitroaromatic vapours with diketopyrrolopyrrole thin films: exploring the role of structural order and morphology on thin film properties and fluorescence quenching efficiency

2015 ◽  
Vol 51 (6) ◽  
pp. 1143-1146 ◽  
Author(s):  
Monika Warzecha ◽  
Jesus Calvo-Castro ◽  
Alan R. Kennedy ◽  
Alisdair N. Macpherson ◽  
Kenneth Shankland ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Fluorescence Quenching ◽  
Optical Detection ◽  
Film Properties ◽  
Structural Order ◽  
Quenching Efficiency ◽  
First Time

Sensitive optical detection of nitroaromatic vapours with diketopyrrolopyrrole thin films is reported for the first time.

Enhanced properties of metal–organic framework thin films fabricated via a coordination modulation-controlled layer-by-layer process

2017 ◽  
Vol 5 (26) ◽  
pp. 13665-13673 ◽  
Author(s):  
Suttipong Wannapaiboon ◽  
Kenji Sumida ◽  
Katharina Dilchert ◽  
Min Tu ◽  
Susumu Kitagawa ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Adsorption Capacity ◽  
Metal Organic Framework ◽  
Layer By Layer ◽  
Film Properties ◽  
Metal Organic ◽  
Enhanced Properties ◽  
P Addition ◽  
Organic Framework

Addition of a modulator in the LPE process enhances MOF thin film properties by boosting their crystallinity, orientation uniformity, and adsorption capacity.

Stability Studies on Optical and Structure Properties of Zinc Oxide Thin Films Exposed to Different Environment

2013 ◽  
Vol 667 ◽  
pp. 549-552
Author(s):  
A.S.M. Rodzi ◽  
Mohamad Hafiz Mamat ◽  
M.N. Berhan ◽  
Mohamad Rusop Mahmood
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Zinc Oxide ◽  
Absorption Coefficient ◽  
Near Infrared ◽  
Thin Film Deposition ◽  
Film Deposition ◽  
Zno Films ◽  
Zno Thin Film ◽  
Oxide Thin Films

The properties of zinc oxide thin films were prepared by sol-gel spin-coating method have been presented. This study based on optical and electrical properties of ZnO thin film. The effects of annealing temperatures that exposed with two environments properties have been investigated. Environments exposed in room (27°C) and hot (80°C) temperatures which are stored by various days. Solution preparation, thin film deposition and characterization process were involved in this project. The ZnO films were characterized using UV-Vis-NIR spectrophotometer for optical properties. From that equipment, the percentage of transmittance (%) and absorption coefficient spectra were obtained. With two environments showed have different absorption coefficient are reveal and all films have low absorbance in visible and near infrared (IR) region but have high UV absorption properties. From SEM investigations the surface morphology of ZnO thin film shows the particles size become smaller and denser in hot temperatures while in room temperatures have porosity between particles.

scholarly journals Effect of DC Biased Voltage and Ion Temperature on Bounded Ion-Ion Plasma

2020 ◽  
Vol 25 (1) ◽  
pp. 61-67
Author(s):  
Anish Maskey ◽  
Atit Deuja ◽  
Suresh Basnet ◽  
Raju Khanal
Keyword(s):  
Electric Field ◽  
Strong Electric Field ◽  
Negative Ions ◽  
Simulation Method ◽  
Negative Ion ◽  
Ion Temperature ◽  
Plasma Parameters ◽  
Degree Of Ionization ◽  
Particle In Cell ◽  
Ion Plasma

 A one dimensional particle-in-cell (PIC) simulation method has been employed to study the effect of DC voltage and ion temperature on the properties of ion-ion plasma bounded by two symmetrical but oppositely biased electrodes. It is assumed that the ion-ion plasma is collisionless and both the positive and negative ion species have the same mass, temperature, and degree of ionization. Simulation results show that the formation of sheath and presheath regions and fluctuation of plasma parameters in that region are affected by the biasing voltage and ion temperature. It was found that the magnitude of the electrostatic electric field at the vicinity of biasing electrodes was affected by the biasing voltage and ion temperature as well. This strong electric field close to the electrodes further prevents the flow of charged particles towards the electrodes. The presence of a non-zero electric field at the quasineutral region suggests a presheath region similar to the electron-ion plasma. In the quasineutral region, the density of ions increased with the increase in biasing voltage and decreased with the increase in temperature of isothermal ions. Furthermore, the phase space diagrams for the ions were obtained which indicated different regions of the plasma. The positive ions acquire negative velocity towards the negatively biased electrode and the negative ions acquire positive velocity towards the positively biased electrode.

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