Strong optical absorption of LaMn0.6Al0.4O3 thin films in the mid-infrared atmospheric window

RSC Advances ◽  
2016 ◽  
Vol 6 (58) ◽  
pp. 53389-53392 ◽  
Author(s):  
Hongguang Wang ◽  
Lei Wang ◽  
PengFei Hu ◽  
Wei Ren ◽  
Jinbao Xu ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Optical Absorption ◽  
Light Absorption ◽  
Strong Light ◽  
Mid Infrared ◽  
Atmospheric Window

Strong light absorption in the mid-infrared atmosphere window (3–5 μm) was reported for complete (100)-oriented LaMn0.6Al0.4O3 thin film.

New tailored organic semiconductors thin films for optoelectronic applications

2021 ◽  
Author(s):  
Dinesh Pathak ◽  
Sanjay Kumar ◽  
Sonali Andotra ◽  
Jibin Thomas ◽  
Navneet Kaur ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Solar Cell ◽  
Optical Absorption ◽  
Band Gap ◽  
Organic Semiconductors ◽  
Low Cost ◽  
Organic Thin Film ◽  
Vis Spectroscopy ◽  
Carbon Based

In this study, we have investigated new tailored organic semiconductors materials for the optoelectronic application, such as organic solar cells. The carbon-based organic semiconductor material has promising advantages in organic thin-film form. Moreover, due to its low cost, organic thin-films are suitable and cheaper than inorganic thin-film. The band gap of organic semiconductors materials can be tuned and mostly lies between 2.0eV to 4eV and the optical absorption edge of organic semiconductors typically lies in between 1.7eV to 3eV. They can be easily tailored by modifying the carbon chain and legends and looks promising for engineering the band gap to harness solar spectrum. In this work, with new tailored organic semiconductors the solution route is explored which is low cost processing method. (Anthracen-9-yl) methylene naphthalene-1-amine, 4-(anthracen-9-ylmethyleneamino)-1,5dimethyl-2-phenyl-1H-pyrazol-3-one and N-(anthracen-9-ylmethyl)-3,4-dimethoxyaniline thin-films are processed by spin coating method with changing concentration such as 0.05 wt% and 0.08 wt%. Thin films of Organic semiconductors were prepared on glass substrate and annealed at 55°C. The structural and optical behaviour of (Anthracen-9-yl) methylene naphthalene-1-amine, 4-(anthracen-9-ylmethyleneamino)-1,5dimethyl-2-phenyl-1H-pyrazol-3-one and N-(anthracen-9-ylmethyl)-3,4-dimethoxyaniline organic semiconductors thin films is studied by X-ray diffraction (XRD), Scanning electron microscopy (SEM) and UV-Visible Spectroscopy technique. The XRD data of synthesized sample suggests the Nano crystallinity of the Organic layers. The SEM micrographs shows the dense packing when we increase the wt% 0.05 to 0.08. Analysis of the optical absorption measurements found that the engineered band gap of synthesized thin films are 2.18eV, 2.35eV, 2.36eV, 2.52eV and 2.65eV which suggest suitability for applications of Optoelectronic devices such as solar cell. Such light weight, eco-friendly and disposable new carbon based materials seems to have potential to replace other traditional hazardous heavy materials for future eco-friendly flat fast electronics. Keywords: Thin-film, solar cell, tailored organic semiconductors, XRD, SEM, UV-Vis spectroscopy.

Plasmon-enhanced light absorption at organic-coated interfaces: collectivity matters

2018 ◽  
Vol 6 (6) ◽  
pp. 1413-1420 ◽  
Author(s):  
Alexandra I. Zvyagina ◽  
Alexander A. Ezhov ◽  
Ivan N. Meshkov ◽  
Vladimir K. Ivanov ◽  
Kirill P. Birin ◽  
...  
Keyword(s):  
Thin Films ◽  
Gold Nanoparticles ◽  
Optical Absorption ◽  
Intermolecular Interactions ◽  
Light Absorption ◽  
Organic Dyes

Intermolecular interactions in thin films of organic dyes control the enhancement of the optical absorption by collective plasmons of gold nanoparticles.

Structural, Electrical and Optical Properties of Laser Deposited Thin Films of Srco0.8Fe0.2O3-δ

1994 ◽  
Vol 369 ◽  
Author(s):  
C. Zhang ◽  
H. Deng ◽  
J. Varon ◽  
B. Abeles ◽  
Y. Yang ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Activation Energy ◽  
Electrical Conductivity ◽  
Optical Properties ◽  
Optical Absorption ◽  
Laser Deposition ◽  
Electrical And Optical Properties ◽  
Thermally Activated ◽  
Characteristic Features

AbstractThin film SrCo0.8Fe0.2O3-δ were made by pulse laser deposition. The electrical conductivity is thermally activated in the temperature 25-500 °C with an activation energy of 0.17-0.19 eV and is temperature independant from 500-800 °C. The optical absorption shows characteristic features which are interpreted qualitatively in terms of a simple band structure diagram.

Structural and optical properties of Zn1−xCoxO and ZnCo2O4 thin films

2005 ◽  
Vol 891 ◽  
Author(s):  
Kousik Samanta ◽  
Pijush Bhattacharya ◽  
Ram S. Katiyar ◽  
W. Iwamoto ◽  
R. R. Urbano ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Optical Properties ◽  
Optical Absorption ◽  
Room Temperature ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Structural And Optical Properties ◽  
Ceramic Targets ◽  
Co Concentrations

ABSTRACTThin films of Co substituted ZnO and ZnCo2O4 were deposited on c-axis (0001) oriented Al2O3 substrates using pulsed laser deposition. The XRD results showed all the films were highly (002) oriented with a less intense peak of (311) for ZnCo2O4 thin film. Micro-Raman spectra of ceramic targets showed the modes related to wurtzite ZnO and spinel ZnCo2O4 structures. In thin films of Zn1−xCoxO no modes corresponding to ZnCo2O4 were detected. The intensity of E1(LO) and multiphonon peak at 584 and 540 cm−1 respectively, increased with increase in Co substitution. The optical absorption of the films showed that the band gap decreased with increase of Co concentrations at room temperature along with the sub-bandgap absorptions due to d-d transitions of Co2+. Similar sub-bandgap d-d transition was also observed in the absorption spectra ZnCo2O4 thin films. The highest saturated magnetization (0.2μB/Co) was obtained for 5%Co substituted ZnO.

scholarly journals Mechanical Behavior of Spin-Coated Sb2S3 light Absorption Thin Films

2021 ◽  
Vol 59 (1) ◽  
pp. 1-7
Author(s):  
Mao Zhang ◽  
Dayoung Yoo ◽  
Youngseon Jeon ◽  
Dongyun Lee
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Mechanical Properties ◽  
Light Absorption ◽  
Indentation Test ◽  
Flexible Devices ◽  
Heat Treated ◽  
Coating Method ◽  
Continuous Stiffness Measurement ◽  
Fto Glass

To measure the mechanical properties of Sb2S3, a two-component compound semiconductor used in the light absorption layer of a solar cell, Sb2S3 thin films were formed on FTO glass using the spin coating method. The spin-coated Sb2S3 thin films were heat-treated at 200 <sup>o</sup>C in an Ar atmosphere for up to 1 hour to form a thin film with continuous crystalline structures. A nanoindentation system was used to measure the mechanical properties of the spin-coated Sb2S3 thin films, and the phenomena appearing during indentation were analyzed. We used the continuous stiffness measurement (CSM) technique, and Young's modulus and hardness measured with the indentation depth of 250 nm were about 53.1 GPa and 1.43 GPa, respectively. The results were analyzed and compared with literature values, which varied from 40 GPa for the nanowire forms of Sb2S3 to 117 GPa, based upon simulation results. Since there are few studies on the mechanical properties of spin-coated Sb2S3 thin films, the results of this study are worthwhile. Besides, we observed that the Sb2S3 thin film had a little brittleness in the indentation test at higher load, and the microstructure was pushed around the indenter depending on the degree of bonding to the FTO glass substrate. This is a matter to be considered when making flexible devices in the future.

Texture-tuned growth of CdTe thin films by closed-space sublimation technique

2008 ◽  
Vol 23 (1) ◽  
pp. 31-34
Author(s):  
Shang Fei ◽  
Ji-kang Jian ◽  
Wu Rong ◽  
Zheng Yu-feng ◽  
Sun Yan-fei
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Optical Absorption ◽  
Band Gaps ◽  
Cdte Thin Film ◽  
Closed Space ◽  
Heating Current ◽  
Closed Space Sublimation ◽  
Cdte Thin Films ◽  
Space Sublimation

CdTe thin films were grown on indium tin oxide glass substrates by a closed-space sublimation method using a resistor heater. Crystalline structure, morphology, and band gaps of the films were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and optical absorption, respectively. The XRD analysis showed that the textures of the films were found to depend on the rate of increase in the heating current. The CdTe thin film had an (111) texture when the heating current rate was 2.0 A/min. The SEM analysis revealed that the film is composed of polyhedral grains of microns size. However, the (111) texture of the CdTe thin film observed by XRD decreased with the appearance of (220), (311), (400), (331), (422), and (511) peaks of the fcc CdTe phase when the heating current rate increased to 4.5 A/min. The (111) texture disappeared when the heating current was increased immediately from 0 A to the target current of 70 A. SEM results revealed that the grains in the film are round and the grain size is smaller than 1 μm. Optical absorption analysis showed that there is no distinctive difference in the band gaps of the films.

Plasmonic Enhancement of Optical Absorption of UV Radiation in ZnO Thin Film Based Ultraviolet Photodetectors

2013 ◽  
Vol 1509 ◽  
Author(s):  
Akshta Rajan ◽  
Ayushi Paliwal ◽  
Vinay Gupta ◽  
Monika Tomar
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Optical Absorption ◽  
Film Surface ◽  
Zno Thin Films ◽  
Zno Thin Film ◽  
Plasmonic Enhancement ◽  
Ag Nps ◽  
Uv Photodetectors ◽  
Photoconductive Gain

ABSTRACTUltraviolet (UV) photoconductivity in pure ZnO thin films and metal (Ag, Au, Pt) nanoparticles (NPs) dispersed on ZnO thin films based UV photodetectors biased at 5 V for ultra violet radiation of λ = 365 nm and intensity = 24 µwatt/cm2 has been studied. All the three metal (Ag, Au, Pt) NPs synthesized by Polyol process when dispersed on the surface of 100 nm thin ZnO film results in enhanced photoconductive gain (K) in comparison to pure ZnO (3.1×103). An increase of about an order in K has been obtained in the case of Ag NPs/ZnO and Au NPs/ZnO UV photodetectors ( K = 6.9×104 and 5.3×104 respectively). On the other hand, Pt NPs enhance K by about two orders (5.0×105). Such an enhanced photoconductive gain has been achieved due to the lowering of dark current after dispersing the metal NPs on the surface of ZnO and increased photocurrent upon UV illumination. This may be attributed to the plasmon propagating property in metal NPs which enhances the light trapping through optical absorption in ZnO thin film surface (high photo current).

scholarly journals Some Preliminary Results of the Synthesis and Investigation of the Glass/FTO/Si/Au/ Embedded Thin Film for Application in the Modified Plasmonic Solar Cell

2021 ◽  
Vol 37 (1) ◽  
Author(s):  
Nguyen Tien Thanh ◽  
Dao Tien Thanh ◽  
Nguyen Si Hieu ◽  
Nguyen Thi Mai Huong
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Surface Layer ◽  
Solar Cell ◽  
Optical Absorption ◽  
Thermal Annealing ◽  
Solar Cell Performance ◽  
Vis Spectroscopy ◽  
Amorphous Si

This paper outlines the synthesis of the glass/FTO/Au/ and of the glass/FTO/Si/Au/ nanoparticles embedded thin films and then outlines some obtained experiment results concerning their properties of surface morphology, structure, chemical composition and optical absorption in comparison. Based on the measured results of SEM, EDX, XRD and UV-VIS spectroscopy we observed that the structure of the sputtered Si layer is amorphous phase meanwhile the structure of the sputtered Au layer is crystallized phase. Depending on the sputtered layers (Si, Au) thicknesses and technological conditions the different surfaces morphologies of the Au flat surface layer or the Au bumpy surface layer with different sizes of nanoparticles /clusters are formed on both the samples surfaces of FTO and amorphous Si layers. Notably, the optical absorption spectra of glass/FTO/Si/Au thin film in both cases of thermal annealing and without thermal annealing are significantly enhanced and shifted to blue- and red regions, these results can be explained by the role of the amorphous Si layer, as well as the Si/Au Schottky layers/nanoparticles barrier configurations caused. The glass/FTO/Si/Au layer/nanoparticles thin films could be used for integration with the core structure (Au/TiO2) of plasmonic solar cell for aiming to  enhance the solar cell performance.

Studies on Water in the Hydration Chamber of a Modified Electron Microscope

1970 ◽  
Vol 28 ◽  
pp. 544-545
Author(s):  
R. C. Moretz ◽  
G. G. Hausner ◽  
D. F. Parsons
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Electron Microscope ◽  
Steady State ◽  
Room Temperature ◽  
Small Mass ◽  
Equilibrium Pressure ◽  
Biological Objects ◽  
Mechanical Pump ◽  
Differential Pumping

Use of the electron microscope to examine wet objects is possible due to the small mass thickness of the equilibrium pressure of water vapor at room temperature. Previous attempts to examine hydrated biological objects and water itself used a chamber consisting of two small apertures sealed by two thin films. Extensive work in our laboratory showed that such films have an 80% failure rate when wet. Using the principle of differential pumping of the microscope column, we can use open apertures in place of thin film windows.Fig. 1 shows the modified Siemens la specimen chamber with the connections to the water supply and the auxiliary pumping station. A mechanical pump is connected to the vapor supply via a 100μ aperture to maintain steady-state conditions.

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