共查询到20条相似文献,搜索用时 62 毫秒
1.
T. Tsuchiya F. Yamaguchi I. Morimoto T. Nakajima T. Kumagai 《Applied Physics A: Materials Science & Processing》2010,98(4):745-749
A tin-doped indium oxide (ITO) film on a SiO2 substrate was prepared by photo-irradiation of spin-coated nanoparticles using a Xe excimer lamp and a KrF excimer laser.
The effects of the excimer lamp and the excimer laser on the resistivity, mobility, and carrier concentration of the film
were investigated. To better understand how to control the microstructure of the film, we investigated the effect of thickness
on the resistivity of a film prepared by the two-step process, and found that the resistivity was higher in a thicker film.
Using two-step irradiation plus one-step KrF irradiation in N2 at room temperature, we produced an ITO film with lowest resistivity of any in this study. The electrical resistivity of
this film was 5.94×10−4 Ω cm. On the other hand, when using a simple thermal process, the resistivity of a film sintered at 500°C in N2 was 4.10×10−3 Ω cm. The differences in resistivity are discussed on the basis of the microstructure of the films using atomic force microscopy
and Hall measurements. 相似文献
2.
Laser-induced site-selective silver seeding on polyimide for electroless copper plating 总被引:2,自引:0,他引:2
Ag particles were generated on Ag+-doped polyimide film by laser direct writing, followed by selective copper deposition using the metallic silver particles as seeds. Laser irradiation caused in situ reduction and agglomeration of silver on the polyimide film. The copper lines were less uniform and compact with higher scanning velocity and the width of the deposited copper line could reach 25 μm. Equations of the relationship between scanning velocity and connectivity of the deposited copper patterns have been derived. The process was characterised by AFM, XPS, SEM, and semiconductor characterisation system. 相似文献
3.
Xin Chen Jun Tao Gang Zou Qijin Zhang Pei Wang 《Applied Physics A: Materials Science & Processing》2010,100(1):223-230
Diacetylene monomer containing p-nitrophenyl azobenzene moiety (NADA) was synthesized. Silver nanoparticles with different
concentrations were adulterated in the above polymerized NADA (PNADA) films and the third-order nonlinear optical properties
were investigated in detail. UV–vis spectra and transmission electron microscopy were used to confirm the formation of PNADA/Ag
nanocomposite films. The silver nanoparticles (average size of 10 nm) were well dispersed in the polymer films. The value
of the nonlinear refractive index n
2 for PNADA films (8.48×10−15 cm2/W) was much higher than that of pure polydiacetylene films. Further, the introduction of silver nanoparticles into the PNADA
polymer films led to the further enhancement of nonlinear optical properties. The maximum value of n
2 for PNADA/Ag nanocomposite films could be 11.6×10−15 cm2/W. This enhancement should be ascribed to the surface plasmon resonance of silver nanoparticles. 相似文献
4.
Doo-Hyeb Youn Seong-Hyun Kim Yong-Suk Yang Sang-Chul Lim Seong-Jin Kim Su-Han Ahn Hyo-Sun Sim Seung-Myoung Ryu Dong-Wook Shin Ji-Beom Yoo 《Applied Physics A: Materials Science & Processing》2009,96(4):933-938
This paper introduces for the first time near-field electrohydrodynamic jet printing with tilted-outlet nozzle to obtain the fine and highly conductive patterns of silver (Ag) ink. Line widths produced by near-field electrohydrodynamic
jet printing are less than 6 μm, which is approximately twenty times smaller than that of inkjet printing. Under optimized
Ag ink annealing ranges 3–9 min for 30 wt% at 150°C, we observed Ag line pattern resistivities as low as 7×10−6 Ω⋅cm. Ag ink conduction mechanisms were brought to light from microstructure analysis and post-thermal-annealing examination
of electrical characteristics. 相似文献
5.
Jyh-Kang Chen Jeng-Rong Ho Yu-Hsuan Lin Raymond Chien-Chao Tsiang 《Applied Physics A: Materials Science & Processing》2011,105(1):249-254
This study characterizes electrical properties of silver thin films with meshed nanostructures fabricated through the photoreduction
of solid silver nitrate thin films using excimer laser irradiation. Variations of mesh morphology as functions of laser irradiation
time and fluences are examined; and the relationship between the film’s electrical resistance and mesh structure are addressed.
The course of nanomesh formation can be separated into two main phases: precipitation of silver nanoparticles as a result
of photoreduction; and, formation of mesh nanostructures through the photothermal effect. The resulting electrical resistance
depends strongly on the mesh nanostructure. With a suitable arrangement of laser fluence and irradiation time, silver thin
films with well interconnected nanomeshes can be fabricated. Results show that silver thin films with low electrical resistivity,
down to 8.5×10−8 Ω m, are easily obtainable. The laser reduction approach takes advantage of the flexibility in local patterning. Moreover,
the reduction is from a solid silver nitrate thin film and is executed in the ambient environment that renders this approach
a potential method for low-temperature fabrication of metallic electrode conductors for organic electronics. 相似文献
6.
In this article, silver nanoparticles were synthesized by chemical reduction from silver nitrate using triethylamine as the
protecting and reducing agents simultaneously. The average size of the silver nanoparticles was about 2.10–4.65 nm, which
allowed low-temperature sintering of the metal. X-ray diffraction (XRD), thermogravimetric analysis (TGA), and energy dispersive
spectrometric (EDS) analysis results indicate that silver nitrate has been converted to silver nanoparticles completely. Using
a 20 wt% silver nanoparticles suspension with thermal treatment at 150 °C, silver films with a resistivity of 8.09 × 10−5 Ω cm have been produced, which is close to the resistivity of bulk silver. 相似文献
7.
Daeho Lee Heng Pan Seung Hwan Ko Hee K. Park Eunpa Kim Costas P. Grigoropoulos 《Applied Physics A: Materials Science & Processing》2012,107(1):161-171
A solution-processable, high-concentration transparent ZnO nanoparticle (NP) solution was successfully synthesized in a new
process. A highly transparent ZnO thin film was fabricated by spin coating without vacuum deposition. Subsequent ultra-short-pulsed
laser annealing at room temperature was performed to change the film properties without using a blanket high temperature heating
process. Although the as-deposited NP thin film was not electrically conductive, laser annealing imparted a large conductivity
increase and furthermore enabled selective annealing to write conductive patterns directly on the NP thin film without a photolithographic
process. Conductivity enhancement could be obtained by altering the laser annealing parameters. Parametric studies including
the sheet resistance and optical transmittance of the annealed ZnO NP thin film were conducted for various laser powers, scanning
speeds and background gas conditions. The lowest resistivity from laser-annealed ZnO thin film was about 4.75×10−2 Ω cm, exhibiting a factor of 105 higher conductivity than the previously reported furnace-annealed ZnO NP film and is even comparable to that of vacuum-deposited,
impurity-doped ZnO films within a factor of 10. The process developed in this work was applied to the fabrication of a thin
film transistor (TFT) device that showed enhanced performance compared with furnace-annealed devices. A ZnO TFT performance
test revealed that by just changing the laser parameters, the solution-deposited ZnO thin film can also perform as a semiconductor,
demonstrating that laser annealing offers tunability of ZnO thin film properties for both transparent conductors and semiconductors. 相似文献
8.
Y. W. Li Z. G. Hu F. Y. Yue W. Z. Zhou P. X. Yang J. H. Chu 《Applied Physics A: Materials Science & Processing》2009,95(3):721-725
(La0.5Sr0.5)CoO3 (LSCO) thin films have been fabricated on silicon substrate by the pulsed laser deposition method. The effects of substrate
temperature and post-annealing condition on the structural and electrical properties are investigated. The samples grown above
650°C are fully crystalline with perovskite structure. The film deposited at 700°C has columnar growth with electrical resistivity
of about 1.99×10−3 Ω cm. The amorphous films grown at 500°C were post-annealed at different conditions. The sample post-annealed at 700°C and
10−4 Pa has similar microstructure with the sample in situ grown at 700°C and 25 Pa. However, the electrical resistivity of the
post-annealed sample is one magnitude higher than that of the in situ grown sample because of the effect of oxygen vacancy.
The temperature dependence of resistivity exhibits semiconductor-like character. It was found that post-annealing by rapid
thermal process will result in film cracks due to the thermal stress. The results are referential for the applications of
LSCO in microelectronic devices. 相似文献
9.
T. C. He C. S. Wang X. Pan C. Z. Zhang G. Y. Lu 《Applied physics. B, Lasers and optics》2009,94(4):653-659
A novel azobenzene-containing fluorinated polyimide was synthesized. The nonlinear optical property and photoinduced birefringence
of a polyimide thin film were investigated. Large third-order nonlinear refraction (n
2=−4.49×10−11 cm2/W) was observed in the polyimide thin film by carrying out Z-scan measurement. The polyimide thin film exhibited larger nonlinear
refraction than that of a mono-azo dye doped PMMA thin film (n
2=−1.63×10−12 cm2/W). The photoinduced birefringence of the polyimide thin film (▵
n∼10−2) under different pump intensities was investigated; it was much larger than that of the mono-azo dye doped PMMA thin film
(▵
n∼10−3). Moreover, the time constants for birefringence growth and relaxation processes were determined. 相似文献
10.
Deok Kyu Kim Kyeong Min Kim Choon Bae Park 《Applied Physics A: Materials Science & Processing》2010,98(4):913-917
A p-type ZnO thin film was prepared using arsenic diffusion via the ampoule-tube method. This was followed by fabrication
of a ZnO p–n homojunction using n-type ZnO and characterization of the device properties. The ZnO thin film exhibited p-type
characteristics, with a resistivity of 2.19×10−3 Ω cm, a carrier concentration of 1.73×1020/cm3, and a mobility of 26.7 cm2/V s. Secondary ion mass spectrometer analysis confirmed that in- and out-diffusion occurred simultaneously from the external
As source and the GaAs substrate. The device exhibited the rectification characteristics of a typical p–n junction; the forward
voltage at 20 mA was approximately 5.5 V. The reverse-bias leakage current was very low—0.1 mA for −10 V; the breakdown voltage
was −11 V. The ampoule-tube method for fabricating p-type ZnO thin films may be useful in producing ultraviolet ZnO LEDs and
other ZnO-based devices. 相似文献
11.
Transparent conducting Zn−Sn−O films were deposited on Polypropylene adipate thin-film substrates at low temperature by r.
f. magnetron sputtering. The structural, electrical and optical properties of the deposited films were investigated. All the
obtained films are of amorphous structure and have a very good adhesion to the substrates. The resistivity, carrier concentration
and Hall mobility of the film are 1.3×10−2 Ω·cm, 4.1×1019 cm−3 and 12.4 cm2· V−1· s−1, respectively. The transmittance of the film reaches 82%. 相似文献
12.
Chan y Díaz E. Duarte-Moller A. Camacho Juan M. Castro-Rodríguez R. 《Applied Physics A: Materials Science & Processing》2012,106(3):619-624
SnO2 thin films have been deposited on glass substrates by pulsed Nd:YAG laser at different oxygen pressures, and the effects
of oxygen pressure on the physical properties of SnO2 films have been investigated. The films were deposited at substrate temperature of 500°C in oxygen partial pressure between
5.0 and 125 mTorr. The thin films deposited between 5.0 to 50 mTorr showed evidence of diffraction peaks, but increasing the
oxygen pressure up to 100 mTorr, three diffraction peaks (110), (101) and (211) were observed containing the SnO2 tetragonal structure. The electrical resistivity was very sensitive to the oxygen pressure. At 100 mTorr the films showed
electrical resistivity of 4×10−2 Ω cm, free carrier density of 1.03×1019 cm−3, mobility of 10.26 cm2 V−1 s−1 with average visible transmittance of ∼87%, and optical band gap of 3.6 eV. 相似文献
13.
A sequential three-dimensional (3D) particle-in-cell simulation code PICPSI-3D with a user friendly graphical user interface
(GUI) has been developed and used to study the interaction of plasma with ultrahigh intensity laser radiation. A case study
of laser–plasma-based electron acceleration has been carried out to assess the performance of this code. Simulations have
been performed for a Gaussian laser beam of peak intensity 5 × 1019 W/cm2 propagating through an underdense plasma of uniform density 1 × 1019 cm − 3, and for a Gaussian laser beam of peak intensity 1.5 × 1019 W/cm2 propagating through an underdense plasma of uniform density 3.5 × 1019 cm − 3. The electron energy spectrum has been evaluated at different time-steps during the propagation of the laser beam. When the
plasma density is 1 × 1019 cm − 3, simulations show that the electron energy spectrum forms a monoenergetic peak at ~14 MeV, with an energy spread of ±7 MeV.
On the other hand, when the plasma density is 3.5 × 1019 cm − 3, simulations show that the electron energy spectrum forms a monoenergetic peak at ~23 MeV, with an energy spread of ±7.5 MeV. 相似文献
14.
Thin silver films were deposited by pulsed laser ablation in a controlled Ar atmosphere and their SERS activity was investigated.
The samples were grown at Ar pressures between 10 and 70 Pa and at different laser pulse numbers. Other deposition parameters
such as laser fluence, target to substrate distance and substrate temperature were kept fixed at 2.0 J/cm2, 35 mm and 297 K. Film morphologies were investigated by scanning and transmission electron microscopies (SEM, TEM). Surface
features range from isolated nearly spherical nanoparticles to larger islands with smoothed edges. Cluster growth is favored
by plume confinement induced by background gas. After landing on the substrate clusters start to aggregate giving rise to
larger structures as long as the deposition goes on. Such a path of film growth allows controlling the surface morphology
as a function of laser pulse number and Ar pressure. These two easy-to-manage process parameters control the number density
and the average size of the as-deposited nanoparticles. We investigated the influence of substrate morphologies on their surface
enhanced Raman scattering properties. Raman measurements were performed after soaking the samples in rhodamine 6G aqueous
solutions over the concentration range between 1.0 × 10−4 and 5.0 × 10−8 M. The sensitivity of the film SERS activity on the surface features is put into evidence. 相似文献
15.
Ion-conducting thin film polymer electrolytes based on poly(ethylene oxide) (PEO) complexes with NaAlOSiO molecular sieves
powders has been prepared by solution casting technique. X-ray diffraction, scanning electron microscopy, differential scanning
calorimeter, and alternating current impedance techniques are employed to investigate the effect of NaAlOSiO molecular sieves
on the crystallization mechanism of PEO in composite polymer electrolyte. The experimental results show that NaAlOSiO powders
have great influence on the growth stage of PEO spherulites. PEO crystallization decrease and the amorphous region that the
lithium-ion transport is expanded by adding appropriate NaAlOSiO, which leads to drastic enhancement in the ionic conductivity
of the (PEO)16LiClO4 electrolyte. The ionic conductivity of (PEO)16LiClO4-12 wt.% NaAlOSiO achieves (2.370 ± 0.082) × 10−4 S · cm−1 at room temperature (18 °C). Without NaAlOSiO, the ionic conductivity has only (8.382 ± 0.927) × 10−6 S · cm−1, enhancing 2 orders of magnitude. Compared with inorganic oxide as filler, the addition of NaAlOSiO molecular sieves powders
can disperse homogeneously in the electrolyte matrix without forming any crystal phase and the growth stage of PEO spherulites
can be hindered more effectively. 相似文献
16.
It is found that silver nanoparticles (AgNPs) can further enhance the fluorescence intensity of curcumin (CU) - cetyltrimethylammonium
bromide (CTAB) – nucleic acids and improve its anti-photobleaching activity. Under optimum conditions, the enhanced fluorescence
intensity is proportion to the concentration of nucleic acids in the range of 2.0 × 10−8–1.0 × 10−6 g mL−1 for fish sperm DNA (fsDNA), 2.0 × 10−8–1.0 × 10−6 g mL−1 for calf thymus DNA (ctDNA), 1.0 × 10−8–1.0 × 10−6 g mL−1 for yeast RNA (yRNA), and their detection limits (S/N = 3) are 8.0 ng mL−1, 10.5 ng mL−1 and 5.8 ng mL−1, respectively. This method is used for determining the concentration of DNA in actual sample with satisfactory results. The
interaction mechanism is also studied. 相似文献
17.
The transport of charges in organic photo-active film has been the focus of tremendous research in the past few decades with
the view to understand the physics of the polymers. Bulk heterojunction type devices are particularly more interesting because
of their high power conversion efficiency. We have fabricated organic PV cell based on sandwich type ITO/PEDOT:PSS/APFO green-6:PCBM/LiF/Al
device structure. The space charge limited currents were investigated to be able to derive important transport parameters
of the devices. The measured current agrees very well with trap free space charge limited transport theory. The zero field
mobility and field activation factor found from the data were μ
0=(3.39±0.2)×10−6 m2/V sec and γ=(8.3±0.3)×10−4 (m/V)1/2, respectively. 相似文献
18.
Enrique Camps L. Escobar-Alarcón V. H. Castrejón-Sánchez P. Tolentino-Eslava 《Applied Physics A: Materials Science & Processing》2008,93(3):759-763
Amorphous carbon thin films were deposited by laser ablation of a graphite target, using the fundamental line of a 5 ns Nd:YAG
laser. Deposition was carried out as a function of the plasma parameters (mean kinetic ion energy and plasma density), determined
by means of a planar probe. In the selected working regimes the optical emission from the plasma is mainly due to atomic species,
namely C+ (426.5 nm); however, there is also emission from other atomic species and molecular carbon. The hardness and resistivity
could be varied in the range between 10 and 25 GPa, and 108 and 1011 Ω cm, respectively. The maximum values were obtained at a 200 eV ion energy and 6×1013 cm−3 plasma density, where the maximum quantity of C–C sp3 bonds was formed, as confirmed by Raman spectroscopy. 相似文献
19.
In this work, we study the effect of concentration, host medium, PH and phase states on the fluorescence emission from the
laser dye Rhodamine B pumped by UV laser as exited source. The polymethylmethacrylate PMMA is used as a host medium in case
of solid phase samples while, ethanol and Tetrahydrofuran (THF) are used in case of a liquid one. Laser Induced Fluorescence
(LIF) technique was used to study the fluorescence properties of both cases of liquid and thin film solid-state samples. In
addition, the Dual Thermal Lens (DTL) technique was used to study the quantum yield of these samples. The concentrations of
Rhodamine B in ethanol as solvent between 2 × 10−2 M and 5 × 10−6 M were studied. The maximum fluorescence emission is observed at concentration of Rhodamine B C = 3 × 10−4 M. Comparison studies were investigated for different host medium such as ethanol, THF, PMMA in liquid phase state and PMMA
in solid phase state. The measurements revealed that, the behavior of both phases state was analogous. Rhodamine B/PMMA thin
film sample by ratio of 4:1 and thickness 0.12 mm was found to have the best photostability sample with a quantum yield about
≈0.82. 相似文献
20.
Lee Ming-Kwei Yen Chih-Feng Chiu Shih-Chen 《Applied Physics A: Materials Science & Processing》2011,104(4):1175-1180
The electrical characteristics of thin TiO2 films prepared by metal–organic chemical vapor deposition grown on a p-type InP substrate were studied. For a TiO2 film of 4.7 nm on InP without and with ammonium sulfide treatment, the leakage currents are 8.8×10−2 and 1.1×10−4 A/cm2 at +2 V bias and 1.6×10−1 and 8.3×10−4 A/cm2 at −2 V bias. The lower leakage currents of TiO2 with ammonium sulfide treatment arise from the improvement of interface quality. The dielectric constant and effective oxide
charge number density are 33 and 2.5×1013 cm2, respectively. The lowest mid-gap interface state density is around 7.6×1011 cm−2 eV−1. The equivalent oxide thickness is 0.52 nm. The breakdown electric field increases with decreasing thickness in the range
of 2.5 to 7.6 nm and reaches 9.3 MV/cm at 2.5 nm. 相似文献