Silicon Nanocrystallite Light Emitting Devices Fabricated by Full Pulsed-Laser-Ablation Process

2000 ◽  
Vol 638 ◽  
Author(s):  
Yuka Yamada ◽  
Toshiharu Makino ◽  
Nobuyasu Suzuki ◽  
Takehito Yoshida
Keyword(s):  
Laser Ablation ◽  
Energy Gap ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Si Substrates ◽  
Laser Ablation Process ◽  
Active Layers ◽  
Narrow Bandwidth

AbstractWe have developed silicon (Si) nanocrystallite light-emitting devices synthesized by a novel integrated process in which a size-controlling unit of differential mobility analyzer (DMA) is combined to a nanocrystallite formation unit of pulsed laser ablation (PLA). The size-controlled Si nanocrystallites as active layers have been deposited on Si substrates, and have been covered with stoichiometric indium oxide (In2O3) thin films synthesized also by the PLA process. The electroluminescence (EL) spectra had a narrow bandwidth of 0.15 eV peaked at slightly higher energy region (1.17 eV) than the bulk Si energy gap (1.10 eV), at room temperature.

Semiconductor nanocrystallite formation using inert gas ambient pulsed laser ablation and its application to light-emitting devices

1999 ◽  
Author(s):  
Takehito Yoshida ◽  
Yuka Yamada ◽  
Nobuyasu Suzuki ◽  
Toshiharu Makino ◽  
Takaaki Orii ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Inert Gas ◽  
Light Emitting ◽  
Light Emitting Devices

Observations on the growth of YBa2Cu3O7-δ thin films on MgO by pulsed-laser ablation

1991 ◽  
Vol 49 ◽  
pp. 1068-1069
Author(s):  
M. Grant Norton ◽  
C. Barry Carter
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Laser Ablation ◽  
Substrate Surface ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Thin Film Deposition ◽  
Film Deposition ◽  
Laser Ablation Process ◽  
Deposition Parameters

Pulsed-laser ablation has been widely used to produce high-quality thin films of YBa2Cu3O7-δ on a range of substrate materials. The nonequilibrium nature of the process allows congruent deposition of oxides with complex stoichiometrics. In the high power density regime produced by the UV excimer lasers the ablated species includes a mixture of neutral atoms, molecules and ions. All these species play an important role in thin-film deposition. However, changes in the deposition parameters have been shown to affect the microstructure of thin YBa2Cu3O7-δ films. The formation of metastable configurations is possible because at the low substrate temperatures used, only shortrange rearrangement on the substrate surface can occur. The parameters associated directly with the laser ablation process, those determining the nature of the process, e g. thermal or nonthermal volatilization, have been classified as ‘primary parameters'. Other parameters may also affect the microstructure of the thin film. In this paper, the effects of these ‘secondary parameters' on the microstructure of YBa2Cu3O7-δ films will be discussed. Examples of 'secondary parameters' include the substrate temperature and the oxygen partial pressure during deposition.

Highly OrientedPb(Zr,Ti)O3Thin Films Prepared by Pulsed Laser Ablation on GaAs and Si Substrates with MgO Buffer Layer

1995 ◽  
Vol 34 (Part 1, No. 9B) ◽  
pp. 5154-5157 ◽  
Author(s):  
Atsushi Masuda ◽  
Yasuhiro Yamanaka ◽  
Mitsutoshi Tazoe ◽  
Yasuto Yonezawa ◽  
Akiharu Morimoto ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Buffer Layer ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Si Substrates

scholarly journals Tribological and Thermal Transport of Ag-Vegetable Nanofluids Prepared by Laser Ablation

2020 ◽  
Vol 10 (5) ◽  
pp. 1779 ◽  
Author(s):  
Jaime Taha-Tijerina ◽  
Sadasivan Shaji ◽  
Sreed Sharma Kanakkillam ◽  
Maria Isabel Mendivil Palma ◽  
Karla Aviña
Keyword(s):  
Laser Ablation ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Ablation Process ◽  
Negative Effects ◽  
Mineral Oils ◽  
Manufacturing Operations ◽  
Laser Ablation Process ◽  
The Coefficient Of Friction ◽  
Maximum Improvement

Lubricants and fluids are critical for metal-mechanic manufacturing operations as they reduce the friction and wear of tooling and components, and serve as coolants to dissipate the heat generated in these operations. The proper application of these materials improves machine operative life and tooling, and decreases cost, energy, and time consumption for maintenance, damage, repairs, or the need to exchange pieces/components within the machinery. Natural or vegetable-based lubricants have emerged as a substitute for mineral oils, which harm the environment due to their low biodegradability and have negative effects on human health (e.g., causing skin/respiratory diseases). Thus, finding biocompatible and efficient lubricants has become a technology objective for researchers and industry. This study evaluates soybean-, corn-, and sunflower-based lubricants reinforced with silver (Ag) nanostructures by a pulsed laser ablation process. Thermal and tribological evaluations were performed with varying Ag contents, and temperature-dependent behavior was observed. Thermal conductivity improvements were observed for all nanofluids as the temperature and Ag concentration increased (between 15% and 24%). A maximum improvement of 24% at 50 °C and 10 min exposure time of the pulsed laser ablation process for soybean oil was observed. The tribological evaluations showed improvements in the load-carrying capacity of the vegetable oils, i.e., an increase from 6% to 24% compared to conventional materials. The coefficient of friction performance also showed enhancements with Ag concentrations between 4% and 15%.

Sign in / Sign up

Export Citation Format

Share Document