Effect of Etchant Concentration on the Optical Properties and Surface Topography of MoO3 Selective Solar Absorber Thin Films

MRS Advances ◽  
2020 ◽  
Vol 5 (21-22) ◽  
pp. 1133-1143 ◽  
Author(s):  
R. Akoba ◽  
G. G. Welegergs ◽  
M. Luleka ◽  
J Sackey ◽  
N Nauman ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Cost Effective ◽  
Solar Absorptance ◽  
Solar Absorber ◽  
Solar Absorbers ◽  
Metal Oxide Nanostructures ◽  
Xrd Patterns ◽  
Solar Thermal Applications ◽  
Chemical Etchant

ABSTRACTA novel technique providing a cost effective sustainable wet chemical etching method of synthesizing black Moly thin films rapidly has been presented. A top- down method for fabricating MoO3 has been investigated to understand the effect of chemical etchant concentration on the structural, morphological and optical properties of the thin films on Mo substrates. The XRD patterns demonstrated the formation of Tugarinovite MoO2 films on Mo substrate after annealing at 500°C in a vacuum. In this work, we developed nanostructured MoO3 on Mo substrate solar absorber, with a high solar absorptance of over 89%. These results suggest that solar absorbers made from refractory metal oxide nanostructures can be used for solar thermal applications.

Deposition time dependent study of structural and optical properties of PbS thin films grown by CBD method

2020 ◽  
Vol 13 ◽  
Author(s):  
Minakshi Chaudhary ◽  
Yogesh Hase ◽  
Ashwini Punde ◽  
Pratibha Shinde ◽  
Ashish Waghmare ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Band Gap ◽  
Deposition Time ◽  
Secondary Growth ◽  
Cost Effective ◽  
Xrd Analysis ◽  
Structural Morphology ◽  
Glass Substrates ◽  
Cbd Method

: Thin films of PbS were prepared onto glass substrates by using a simple and cost effective CBD method. Influence of deposition time on structural, morphology and optical properties have been investigated systematically. The XRD analysis revealed that PbS films are polycrystalline with preferred orientation in (200) direction. Enhancement in crystallinity and PbS crystallite size has been observed with increase in deposition time. Formation of single phase PbS thin films has been further confirmed by Raman spectroscopy. The surface morphology analysis revealed the formation of prismatic and pebble-like PbS particles and with increase in deposition time these PbS particles are separated from each other without secondary growth. The data obtained from the EDX spectra shows the formation of high-quality but slightly sulfur rich PbS thin films over the entire range of deposition time studied. All films show increase in absorption with increase in deposition time and a strong absorption in the visible and sub-band gap regime of NIR range of the spectrum with red shift in band edge. The optical band gap shows decreasing trend, as deposition time increases but it is higher than the band gap of bulk PbS.

scholarly journals Chemical Solution Deposition of La-Substituted BiFe0.5Sc0.5O3 Perovskite Thin Films on Different Substrates

Coatings ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 307
Author(s):  
Diana Griesiute ◽  
Dovydas Karoblis ◽  
Lina Mikoliunaite ◽  
Aleksej Zarkov ◽  
Andrei N. Salak ◽  
...  
Keyword(s):  
Thin Films ◽  
Chemical Solution Deposition ◽  
Cost Effective ◽  
Deposition Process ◽  
Stability Study ◽  
Fused Silica ◽  
Chemical Solution ◽  
Solution Deposition ◽  
Optimal Annealing Temperature ◽  
Xrd Patterns

In the present work, polycrystalline Bi0.67La0.33Fe0.5Sc0.5O3 thin films were synthesized using a simple and cost-effective chemical solution deposition process employing the spin coating technique. In order to check the feasibility of the fabrication of thin films on various types of substrates, the films were deposited on Pt-coated silicon, silicon, sapphire, corundum, fused silica and glass. Based on the results of thermogravimetric analysis of precursor and thermal stability study, it was determined that the optimal annealing temperature for the formation of perovskite structure is 600 °C. It was observed that the relative intensity of the pseudocubic peaks (001)p and (011)p in the XRD patterns is influenced by the nature of substrates, suggesting that the formed crystallites have some preferred orientation. Roughness of the films was determined to be dependent on the nature of the substrate.

scholarly journals Effect of Etchant Concentration on the Optical Properties and Surface Topography of MoO3 Selective Solar Absorber Thin Films - CORRIGENDUM

MRS Advances ◽  
2020 ◽  
Vol 5 (43) ◽  
pp. 2249-2249
Author(s):  
R. Akoba ◽  
G. G. Welegergs ◽  
M. Luleka ◽  
J Sackey ◽  
N Nauman ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Surface Topography ◽  
Solar Absorber

scholarly journals Partial and Total Substitution of Zn by Mg in the Cu2ZnSnS4 Structure

Crystals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 578
Author(s):  
Diana M. Mena Romero ◽  
David Victoria Valenzuela ◽  
Cristy L. Azanza Ricardo
Keyword(s):  
Thin Film ◽  
Optical Properties ◽  
Cost Effective ◽  
Energy Conversion Efficiency ◽  
Band Gap Energy ◽  
Fine Tuning ◽  
Secondary Phases ◽  
Solar Absorber ◽  
High Efficient ◽  
Earth Abundant

Cu 2 ZnSnS 4 (CZTS) is a quaternary semiconductor that has emerged as a promising component in solar absorber materials due to its excellent optical properties such as band-gap energy of ca. 1.5 eV and significant absorption coefficient in the order of 10 4 cm − 1 . Nevertheless, the energy conversion efficiency of CZTS-based devices has not reached the theoretical limits yet, possibly due to the existence of antisite defects (such as Cu Zn or Zn Cu ) and secondary phases. Based on electronic similarities with Zn, Mg has been proposed for Zn substitution in the CZTS structure in the design of alternative semiconductors for thin-film solar cell applications. This work aims to study the properties of the CZTS having Mg incorporated in the structure replacing Zn, with the following stoichiometry: x = 0, 0.25, 0.5, 0.75, and 1 in the formula Cu 2 Zn 1 − x Mg x SnS 4 (CZ-MTS). The semiconductor was prepared by the hot injection method, using oleylamine (OLA) as both surfactant and solvent. The presence and concentration of incorporated Mg allowed the fine-tuning of the CZ-MTS semiconductor’s structural and optical properties. Furthermore, it was observed that the inclusion of Mg in the CZTS structure leads to a better embodiment ratio of the Zn during the synthesis, thus reducing the excess of starting precursors. In summary, CZ-MTS is a promising candidate to fabricate high efficient and cost-effective thin-film solar cells made of earth-abundant elements.

scholarly journals Electrochemically Synthesized Nanoflowers to Nanosphere-Like NiCuSe2 Thin Films for Efficient Supercapacitor Application

Metals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1698
Author(s):  
Surendra K. Shinde ◽  
Dae-Young Kim ◽  
Vinayak G. Parale ◽  
Hyung-Ho Park ◽  
Hemraj M. Yadav
Keyword(s):  
Thin Films ◽  
Stainless Steel ◽  
Specific Capacity ◽  
Synergetic Effect ◽  
Cost Effective ◽  
Stainless Steel Mesh ◽  
Supercapacitor Application ◽  
Steel Mesh ◽  
Earth Abundant ◽  
Xrd Patterns

Developing efficient electrochemically active nanostructures from Earth-abundant elements has gained significant interest in recent years. Among different transition metals, nickel and copper are abundant electrocatalysts for energy-storage applications. Nickel–copper selenide (NiCuSe2) nanostructures were prepared on a stainless-steel mesh with a cost-effective, simple, and versatile electrodeposition method for supercapacitor applications. The change effect in the bath concentration of nickel and copper altered the structural and electrochemical properties of NiCuSe2 electrode. X-ray diffraction (XRD) patterns confirmed the pure phase of ternary NiCuSe2 thin films with a cubic crystal structure. The surface morphology of NiCuSe2 was tuned by nickel and copper from spherical porous nanoflowers, nanoplates, nanocubes, and nanosphere-like nanostructures deposited on the stainless-steel mesh. The electrochemical performance of the electrodeposited NiCuSe2 was investigated in alkaline 1 M KOH electrolyte. The synergetic effect of bimetallic nickel and copper with the selenide electrode showed superior specific capacity of about 42.46 mAh g−1 at 10 mV s−1 along with reasonable cycling stability.

scholarly journals An Ultra-High Temperature Stable Solar Absorber Using the ZrC-Based Cermets

2021 ◽  
Vol 9 ◽  
Author(s):  
Jian Wang ◽  
Zuoxu Wu ◽  
Yijie Liu ◽  
Shuaihang Hou ◽  
Zhikun Ren ◽  
...  
Keyword(s):  
High Temperature ◽  
Conversion Efficiency ◽  
Steel Substrate ◽  
Selective Absorption ◽  
Solar Absorptance ◽  
Excellent Thermal Stability ◽  
Solar Absorber ◽  
Solar Absorbers ◽  
Stable Operating ◽  
Ultra High Temperature

Exploring the spectrally selective absorbers with high optical performance and excellent thermal stability is crucial to improve the conversion efficiency of solar energy to electricity in concentrated solar power (CSP) systems. However, there are limited reports on the selective solar absorbers utilized at 900oC or above. Herein, we developed a selective absorption coating based on the ultra-high temperature ceramic ZrC and the quasi-optical microcavity (QOM) optical structure, and experimentally achieved the absorber via depositing an all-ceramic multilayer films on a stainless steel substrate by magnetron sputtering. The prepared multi-layer selective absorber demonstrates an excellent high solar absorptance of ∼0.964 due to the multi absorptance mechanisms in the QOM, and a relatively low thermal emittance of ∼0.16 (82°C). Moreover, the coating can survive at 900oC in vacuum for 100 h with a superior spectral selectivity of 0.96/0.143 (82°C) upon annealing, resulting from the introduction of ultra-high temperature ceramic ZrC in the QOM structure. Under the conditions of a stable operating temperature of 900°C and a concentration ratio of 1,000 suns, the calculated ideal conversion efficiency using this absorber can reach around 68%, exceeding most solar selective absorbers in previous reports.

Investigation of Nanostructure and Optical Properties of Flexible AZO Thin Films at Different Powers of RF Magnetron Sputtering

NANO ◽  
2018 ◽  
Vol 13 (06) ◽  
pp. 1850062 ◽  
Author(s):  
Sh. Khatami ◽  
L. Fekri Aval ◽  
G. Behzadi Pour
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Magnetron Sputtering ◽  
Rf Magnetron Sputtering ◽  
Rf Power ◽  
X Ray Diffraction ◽  
Light Emitting ◽  
Structure Morphology ◽  
Xrd Patterns ◽  
Predominant Direction

In this study Al-doped Zinc Oxide (AZO) thin films were successfully deposited on the flexible Polymethyl methacrylate (PMMA) substrate by RF magnetron sputtering. The effects of RF power on the crystal structure, morphology, thickness and optical properties of AZO thin films have been investigated. The AZO thin films were analyzed using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), DEKTAK 3 profilometer, UV–Visible spectroscopy and room temperature photoluminescence (PL) spectroscopy. The XRD patterns show that increase of RF power leads to increase in the predominant direction along (100) and crystal plane of hexagonal ZnO. Moreover, the transmittance of thin films decreased from 76% to 61% and optical bang gap varied among 3.34[Formula: see text]eV to 3.22[Formula: see text]eV with increasing RF power. The PL spectra show excellent light-emitting characteristics: 375[Formula: see text]nm, 428[Formula: see text]nm, 467[Formula: see text]nm and 505[Formula: see text]nm. The results indicate that the peak intensity increases with increasing RF power from 80[Formula: see text]W to 180[Formula: see text]W.

scholarly journals Impact of annealing on structural and optical properties of CoPc thin films

2015 ◽  
Vol 12 (1) ◽  
pp. 15-21 ◽  
Author(s):  
Husam El-Nasser
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Energy Gap ◽  
Preferential Orientation ◽  
Silicon Substrates ◽  
Structural And Optical Properties ◽  
Optical Energy Gap ◽  
Flat Surfaces ◽  
Unit Cells ◽  
Xrd Patterns

The structural and optical properties of four samples of cobalt phthalocyanine (CoPc) thin films having almost the same thickness deposited onto silicon substrates by organic molecular beam deposition (OMBD) were investigated. The intensity distributions of the X-ray diffraction (XRD) patterns confirm the crystalline nature of the films and presents a single sharp dominant peak at 2q=6.9o (d=12.72 ) of the α-CoPc phase unit cells, which indicates to a preferential orientation (200) direction, then undergoes a phase transition into β- form in a preferential orientation (001) direction after annealing at 250 and 350◦C. Furthermore it was shown that an increasing in the crystallite size (L) occurs upon annealing. The small values of the roughness (7.04 nm, 7.2 nm) obtained from atomic force microscopy (AFM) measurements show relatively smooth and flat surfaces. Despite the identity of the samples deposition conditions, the post growth annealed films show different morphological features of a mean grain size about of 11-26 nm. The optical energy gap was estimated from the absorption coefficient using Tauc's relation.

EFFECT OF SUBSTRATE TEMPERATURE ON THE STRUCTURAL AND THE OPTICAL PROPERTIES OF CdTe (100) EPITAXIAL FILMS GROWN ON GaAs (100) SUBSTRATES

2007 ◽  
Vol 14 (04) ◽  
pp. 755-759 ◽  
Author(s):  
D. U. LEE ◽  
J. H. JUNG ◽  
T. W. KIM ◽  
H. S. LEE ◽  
H. L. PARK ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Substrate Temperature ◽  
Misfit Dislocations ◽  
X Ray Diffraction ◽  
Force Microscopy ◽  
Atomic Force ◽  
Transmission Electron ◽  
Cdte Thin Films ◽  
Xrd Patterns

CdTe thin films were grown on GaAs (100) substrates by using molecular beam epitaxy at various temperatures. The results of the X-ray diffraction (XRD) patterns showed that the orientation of the grown CdTe thin films was the (100) orientation. XRD patterns, atomic force microscopy images, high-resolution transmission electron microscopy (HRTEM) images, and photoluminescence spectra showed that the crystallinity of CdTe (100) epilayers grown on GaAs (100) substrates was improved by increasing the substrate temperature. HRTEM images showed that misfit dislocations existed at the CdTe / GaAs heterointerface. These results can help improve understanding of the substrate temperature effect on the structural and the optical properties of CdTe (100)/ GaAs (100) heterostructures.

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