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11.
High-temperature laser annealing for thin film polycrystalline silicon solar cell on glass substrate
A. Chowdhury J. Schneider J. Dore F. Mermet A. Slaoui 《Applied Physics A: Materials Science & Processing》2012,107(3):653-659
Thin film polycrystalline silicon films grown on glass substrate were irradiated with an infrared continuous wave laser for defects annealing and/or dopants activation. The samples were uniformly scanned using an attachment with the laser system. Substrate temperature, scan speed and laser power were varied to find suitable laser annealing conditions. The Raman spectroscopy and Suns-V oc analysis were carried out to qualify the films quality after laser annealing. A maximum enhancement of the open circuit voltage V oc of about 100?mV is obtained after laser annealing of as-grown polysilicon structures. A strong correlation was found between the full width half maximum of the Si crystalline peak and V oc. It is interpreted as due to defects annealing as well as to dopants activation in the absorbing silicon layer. The maximum V oc reached is 485?mV after laser treatment and plasma hydrogenation, thanks to defects passivation. 相似文献
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Rehab Ali Ibrahim Laith Abualigah Ahmed A. Ewees Mohammed A. A. Al-qaness Dalia Yousri Samah Alshathri Mohamed Abd Elaziz 《Entropy (Basel, Switzerland)》2021,23(9)
With the widespread use of intelligent information systems, a massive amount of data with lots of irrelevant, noisy, and redundant features are collected; moreover, many features should be handled. Therefore, introducing an efficient feature selection (FS) approach becomes a challenging aim. In the recent decade, various artificial methods and swarm models inspired by biological and social systems have been proposed to solve different problems, including FS. Thus, in this paper, an innovative approach is proposed based on a hybrid integration between two intelligent algorithms, Electric fish optimization (EFO) and the arithmetic optimization algorithm (AOA), to boost the exploration stage of EFO to process the high dimensional FS problems with a remarkable convergence speed. The proposed EFOAOA is examined with eighteen datasets for different real-life applications. The EFOAOA results are compared with a set of recent state-of-the-art optimizers using a set of statistical metrics and the Friedman test. The comparisons show the positive impact of integrating the AOA operator in the EFO, as the proposed EFOAOA can identify the most important features with high accuracy and efficiency. Compared to the other FS methods whereas, it got the lowest features number and the highest accuracy in 50% and 67% of the datasets, respectively. 相似文献
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F. A. Fahim R. M. Yousri H. M. Roushdy M. I. Abady 《Isotopes in environmental and health studies》2013,49(7):318-324
The effect of treatment with SrCl2 (10 mg/100 g rat) on rats 15 minutes prior to whole body γ-irradiation (7,5 Gy) was studied. The hazardeous effect of irradiation were greatly corrected in the treated group. The hyperglycemic effect and liver glycogen accumulation in the untreated group decreased to normal level. The enzymatic activities of serum alkaline phosphatase, alanine aminotransferase, aspartate aminotransferase and lactate dehydrogencase were greatly affected showing insignificant changes in the treated group of animals. Life span calculated on 50% survival was also significantly elongated by 36.3%. These results show the potentiality of SrCl2 as a radioprotective agent which was not used before. 相似文献
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Polyethylene oxides are shown to promote an efficient dihalocarbene formation from bromo — and chloroform and solid potassium hydroxide — Adducts with olefins are obtained in High yields. 相似文献
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Yousri D. A. AbdelAty Amr M. Said Lobna A. Elwakil A. S. Maundy Brent Radwan Ahmed G. 《Nonlinear dynamics》2019,95(3):2491-2542
Nonlinear Dynamics - Fractional-order chaotic systems (FOCS) parameter identification is an essential issue in chaos control and synchronization process. In this paper, different recent... 相似文献
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A. Slaoui F. Foulon C. Fuchs E. Fogarassy P. Siffert 《Applied Physics A: Materials Science & Processing》1990,50(3):317-320
The gas immersion laser doping (GILD) technique requires the measurement of the fraction of incident light absorbed in the gas phase during the irradiation with a pulsed laser. Here we report the absorption of boron trichloride (BCl3) gas at the wavelength of a pulsed ArF excimer laser (=193 nm). We have determined the one-photon (1) and two-photon () absorption cross sections of this dopant gas for 193 nm. The values of 1 and are 3.6×10–20 cm2 and 9×10–45 cm4·s, respectively. However, the distinction between simultaneous and sequential absorption has not been possible. Based on these results, we have established a relationship which allows the calculation of the fraction of incident light absorbed as a function of incident intensity and gas pressure. 相似文献
19.
?. Tüzün A. Slaoui C. Maurice S. Vallon 《Applied Physics A: Materials Science & Processing》2010,99(1):53-61
In this work, we present extended structural properties of poly-Si thin films fabricated by aluminium-induced crystallization
(AIC) of amorphous silicon (a-Si) on high-temperature glass-ceramic substrates. The silicon nucleation kinetics on glass-ceramic
substrates was investigated by optical microscopy. The crystalline quality of the films was studied by micro-Raman spectroscopy
as a function of exchange annealing conditions. By means of electron backscattering diffraction (EBSD), we have analyzed the
effect of thermal annealing on silicon grain size and its distribution, intra- and inter-grains defects, and on the grains
preferential crystallographic orientation. The optimal thermal annealing condition, allowing 100% crystallized polysilicon
large grains with an average grain size of 26 μm and 〈100〉 oriented, acquired a thermal budget of 475°C and 8 h. 相似文献
20.
D. Madi P. Prathap A. Focsa A. Slaoui B. Birouk 《Applied Physics A: Materials Science & Processing》2010,99(4):729-734
This work reports the investigations on the effects of the hydrogenation process of thin film polycrystalline n+pp+ mesa silicon cells using MW-ECR plasma in a conventional PECVD system. Different operating parameters such as MW-ECR power,
annealing temperature and the doping level of the emitter region were varied. The n+-type emitter regions were obtained by phosphorus diffusion in a conventional furnace using an oxide doping source containing
phosphorus (P507 or P509 solutions, from Filmtronics Inc.). The MW hydrogenation was carried out at a sample temperature of
400°C for 60 min. Both types of emitters formed from P507 and P509 showed V
oc of 155 mV and 206 mV, which increased linearly to 305 mV and 331 mV, respectively, after hydrogenation when the MW power
varied from 200 to 650 W. However, the sheet resistances of the n+ emitter region showed a slight increase depending upon hydrogenation power because of its etching. In a further study, hydrogenated
samples were annealed in neutral or forming gas (FG) and we observed interesting results on V
oc in the presence of FG. The FG annealing temperature study revealed a strong dependence of V
oc on MW power, which affected the etching level of emitter and emitter dopant concentration, which controls the diffusion of
hydrogen ions during post-hydrogenation step. The results were explained in detail by combining the effects of MW power and
dopant level of the emitter. 相似文献