High quality kerfless silicon mono-crystalline wafers and cells by high throughput epitaxial growth

2014 ◽  
Vol 1666 ◽  
Author(s):  
R. Hao ◽  
T.S. Ravi ◽  
V. Siva ◽  
J. Vatus ◽  
D. Miller ◽  
...  
Keyword(s):  
High Throughput ◽  
Large Scale ◽  
Crystalline Silicon ◽  
High Quality ◽  
Manufacturing Costs ◽  
Key Aspects ◽  
The Cost ◽  
P Type ◽  
Silicon Based

ABSTRACTCrystalline silicon based photovoltaics continues to be the dominant technology for large scale deployment of solar energy. While impressive cost gains in silicon based PV have come with scale, there remains a strong push for increased efficiencies and further lowering of manufacturing costs to achieve true grid parity. So far, however, there has not been a production proven approach that reduces the cost while maintaining or increasing the efficiency. Attempts to reduce the amount of silicon used, for example, have led to development of various kerfless wafer manufacturing approaches. While some of these approaches have shown the potential for reduced costs, they also compromise the efficiency mainly due to the inferior quality of the material.Epitaxy based kerfless silicon wafers, on the other hand, has shown the potential to reverse this trend offering lower manufacturing costs while maintaining or even enhancing the efficiency due to the high quality of the n-type and p-type silicon epitaxial (Epi) wafers. In this work, we present key aspects of Crystal Solar’s patented high throughput production silicon epitaxial reactor and its use in the manufacture of standard thickness N and P wafers. Besides the advantage of having significantly reduced cost, these Epi wafers have high quality, better mechanical strength and resistance to light inducted degradation due to significantly reduced oxygen content.

scholarly journals A Review on Terahertz Technologies Accelerated by Silicon Photonics

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1646
Author(s):  
Jingya Xie ◽  
Wangcheng Ye ◽  
Linjie Zhou ◽  
Xuguang Guo ◽  
Xiaofei Zang ◽  
...  
Keyword(s):  
Integrated Circuit ◽  
Silicon Photonics ◽  
Large Scale ◽  
Cost Effective ◽  
Single Chip ◽  
Photonic Integrated Circuit ◽  
Hybrid Silicon ◽  
The Cost ◽  
Silicon Based ◽  
Thz Applications

In the last couple of decades, terahertz (THz) technologies, which lie in the frequency gap between the infrared and microwaves, have been greatly enhanced and investigated due to possible opportunities in a plethora of THz applications, such as imaging, security, and wireless communications. Photonics has led the way to the generation, modulation, and detection of THz waves such as the photomixing technique. In tandem with these investigations, researchers have been exploring ways to use silicon photonics technologies for THz applications to leverage the cost-effective large-scale fabrication and integration opportunities that it would enable. Although silicon photonics has enabled the implementation of a large number of optical components for practical use, for THz integrated systems, we still face several challenges associated with high-quality hybrid silicon lasers, conversion efficiency, device integration, and fabrication. This paper provides an overview of recent progress in THz technologies based on silicon photonics or hybrid silicon photonics, including THz generation, detection, phase modulation, intensity modulation, and passive components. As silicon-based electronic and photonic circuits are further approaching THz frequencies, one single chip with electronics, photonics, and THz functions seems inevitable, resulting in the ultimate dream of a THz electronic–photonic integrated circuit.

Thermal Laser Separation – A Novel Dicing Technology Fulfilling the Demands of Volume Manufacturing of 4H-SiC Devices

2015 ◽  
Vol 821-823 ◽  
pp. 528-532 ◽  
Author(s):  
Dirk Lewke ◽  
Karl Otto Dohnke ◽  
Hans Ulrich Zühlke ◽  
Mercedes Cerezuela Barret ◽  
Martin Schellenberger ◽  
...  
Keyword(s):  
Experimental Data ◽  
Process Control ◽  
Tool Wear ◽  
Large Scale ◽  
State Of The Art ◽  
Scale Production ◽  
High Quality ◽  
Large Scale Production ◽  
Laser Separation

One challenge for volume manufacturing of 4H-SiC devices is the state-of-the-art wafer dicing technology – the mechanical blade dicing which suffers from high tool wear and low feed rates. In this paper we discuss Thermal Laser Separation (TLS) as a novel dicing technology for large scale production of SiC devices. We compare the latest TLS experimental data resulting from fully processed 4H-SiC wafers with results obtained by mechanical dicing technology. Especially typical product relevant features like process control monitoring (PCM) structures and backside metallization, quality of diced SiC-devices as well as productivity are considered. It could be shown that with feed rates up to two orders of magnitude higher than state-of-the-art, no tool wear and high quality of diced chips, TLS has a very promising potential to fulfill the demands of volume manufacturing of 4H-SiC devices.

GAIN Premix Facility: An Innovative Approach for Improving Access to Quality Vitamin and Mineral Premix in Fortification Initiatives

2012 ◽  
Vol 33 (4_suppl3) ◽  
pp. S381-S389 ◽  
Author(s):  
Philippe Guinot ◽  
Vincent Jallier ◽  
Alessandro Blasi ◽  
Christophe Guyondet ◽  
Marc Van Ameringen
Keyword(s):  
Large Scale ◽  
Edible Oils ◽  
Quality Standards ◽  
Private Industry ◽  
Target Groups ◽  
High Quality ◽  
Adequate Quality ◽  
Standards And Guidelines ◽  
Set Up ◽  
The Cost

Background Vitamin and mineral premix is one of the most significant recurring input costs for large-scale food fortification programs. A number of barriers exist to procuring adequate quality premix, including accessing suppliers, volatile prices for premix, lack of quality assurance and monitoring of delivered products, and lack of funds to purchase premix. Objective To develop and test a model to procure premix through a transparent and efficient process in which an adequate level of quality is guaranteed and a financial mechanism is in place to support countries or specific target groups when there are insufficient resources to cover the cost of premix. Methods Efforts focused on premixes used to fortify flour, such as wheat or maize (iron, zinc, B vitamins, and vitamin A), edible oils (vitamins A and D), and other food vehicles, such as fortified complementary foods, complementary food supplements, and condiments. A premix procurement model was set up with three distinct components: a certification process that establishes industry-wide standards and guidelines for premix, a procurement facility that makes premix more accessible to countries and private industry engaged in fortification, and a credit facility mechanism that helps projects finance premix purchases. Results After three years of operation, 15 premix suppliers and 29 micronutrient manufacturers have been certified, and more than US$23 million worth of premix that met quality standards has been supplied in 34 countries in Africa, Central and Southern Asia, and Eastern Europe, reaching an estimated 242 million consumers. Conclusions The Premix Facility demonstrated its effectiveness in ensuring access to high-quality premixes, therefore enabling the success of various fortification programs.

scholarly journals Scientific and practical fundamentals of growing cabbage (Brassica capitata lizg.) in Uzbekistan

2021 ◽  
Vol 939 (1) ◽  
pp. 012044
Author(s):  
A J Shokirov ◽  
S S Lapasov ◽  
K J Shokirov
Keyword(s):  
Large Scale ◽  
Scientific Research ◽  
Mineral Fertilizers ◽  
Biological Productivity ◽  
High Quality ◽  
Planting Time ◽  
Yield And Quality ◽  
White Cabbage ◽  
Urgent Task

Abstract At present, scientific research is underway to further develop vegetable growing in the secondary crop, in particular to further increase the yield and quality of white cabbage, to select a system of planting time-sowing scheme that maximizes the biological productivity of varieties, and to apply the most optimal standards of fertilization and irrigation. In this regard, the urgent task remains to determine the optimal varieties of cabbage that can be grown in repeated crops, their optimal planting scheme, timing, development and implementation of optimal standards for each variety of mineral fertilizers and irrigation, and its solution is large-scale throughout the country. Besides that a number of problematic issues are addressed, which could allow to get high and high-quality harvest of white cabbage in repeated sowing in grain-free areas.

scholarly journals Laser Welding Of Finned Tubes Made Of Austenitic Steels

2015 ◽  
Vol 60 (3) ◽  
pp. 1807-1812
Author(s):  
M. Stolecki ◽  
H. Bijok ◽  
Ł. Kowal ◽  
J. Adamiec
Keyword(s):  
Laser Welding ◽  
Austenitic Steel ◽  
Technological Process ◽  
Welded Joints ◽  
Austenitic Steels ◽  
Tube Production ◽  
High Quality ◽  
Manufacturing Costs ◽  
Finned Tubes

Abstract This paper describes the technology of welding of finned tubes made of the X5CrNi1810 (1.4301) austenitic steel, developed at Energoinstal SA, allowing one to get high quality joints that meet the requirements of the classification societies (PN-EN 15614), and at the same time to significantly reduce the manufacturing costs. The authors described an automatic technological line equipped with a Trumph disc laser and a tube production technological process. To assess the quality of the joints, one performed metallographic examinations, hardness measurements and a technological attempt to rupture the fin. Analysis of the results proved that the laser-welded finned tubes were performed correctly and that the welded joints had shown no imperfections.

High Throughput SNP Genotyping with Two Mini-sequencing Assays

2004 ◽  
Vol 36 (6) ◽  
pp. 379-384 ◽  
Author(s):  
Chunqing Luo ◽  
Libin Deng ◽  
Changqing Zeng ◽  
You-Xin Jin
Keyword(s):  
High Throughput ◽  
Snp Genotyping ◽  
Success Rates ◽  
Ionization Time ◽  
Data Process ◽  
Pcr Product ◽  
Human Chromosome 3 ◽  
Pcr Technology ◽  
The Cost

Abstract Two mini-sequencing methods, FP-TDI (template-directed dye-terminator incorporation with fluorescence-polarization) and MassArray (matrix assisted laser desorption ionization time of flight detection mass spectrometry), were optimized. A numeric standard was introduced to evaluate the SNP scoring quality of FP-TDI assay, thus made the optimization work easier. At the same time, using multi-PCR technology, 8-plex genotyping of MassArray assay was successfully carried out, some softwares were developed and the data process of MassArray was highly automated. Then these two methods were applied to high throughput SNP genotyping, the accuracy, efficiency and robustness were compared. The result shows FP-TDI is more sensitive to the concentration of SNPprimer and PCR product, as well as extension cycles, the SNPprimer length of FP-TDI should be 24–30 bp long, whereas MassArray assay prefers to be as short as only 16 bp. Altogether 6440 SNP sites of human chromosome 3 were genotyped in a sample of 90 individuals, 4792 sites by FP-TDI assay and 1648 sites by MassArray assay, the success rates of FP-TDI and MassArray were 67.7% and 93.6% respectively. The throughput of MassArray was higher than FP-TDI, and the cost of MassArray was lower, MassArray was more suitable for high throughput SNP genotyping.

scholarly journals A comprehensive RNA handling and transcriptomics guide for high-throughput processing of Plasmodium blood-stage samples

2020 ◽  
Vol 19 (1) ◽  
Author(s):  
Michal Kucharski ◽  
Jaishree Tripathi ◽  
Sourav Nayak ◽  
Lei Zhu ◽  
Grennady Wirjanata ◽  
...  
Keyword(s):  
High Throughput ◽  
Large Scale ◽  
Rna Extraction ◽  
Transcriptome Data ◽  
High Quality ◽  
Diverse Range ◽  
Human Haemoglobin ◽  
Infected Blood ◽  
Blood Samples ◽  
Total Rna

Abstract Background Sequencing technology advancements opened new opportunities to use transcriptomics for studying malaria pathology and epidemiology. Even though in recent years the study of whole parasite transcriptome proved to be essential in understanding parasite biology there is no compiled up-to-date reference protocol for the efficient generation of transcriptome data from growing number of samples. Here, a comprehensive methodology on how to preserve, extract, amplify, and sequence full-length mRNA transcripts from Plasmodium-infected blood samples is presented that can be fully streamlined for high-throughput studies. Results The utility of various commercially available RNA-preserving reagents in a range of storage conditions was evaluated. Similarly, several RNA extraction protocols were compared and the one most suitable method for the extraction of high-quality total RNA from low-parasitaemia and low-volume blood samples was established. Furthermore, the criteria needed to evaluate the quality and integrity of Plasmodium RNA in the presence of human RNA was updated. Optimization of SMART-seq2 amplification method to better suit AT-rich Plasmodium falciparum RNA samples allowed us to generate high-quality transcriptomes from as little as 10 ng of total RNA and a lower parasitaemia limit of 0.05%. Finally, a modified method for depletion of unwanted human haemoglobin transcripts using in vitro CRISPR-Cas9 treatment was designed, thus improving parasite transcriptome coverage in low parasitaemia samples. To prove the functionality of the pipeline for both laboratory and field strains, the highest  2-hour resolution RNA-seq transcriptome for P. falciparum 3D7 intraerythrocytic life cycle available to  date was generated, and the entire protocol was applied to create the largest transcriptome data from Southeast Asian field isolates. Conclusions Overall, the presented methodology is an inclusive pipeline for generation of good quality transcriptomic data from a diverse range of Plasmodium-infected blood samples with varying parasitaemia and RNA inputs. The flexibility of this pipeline to be adapted to robotic handling will facilitate both small and large-scale future transcriptomic studies in the field of malaria.

Properties of 4H-SiC by Sublimation Close Space Technique

1999 ◽  
Vol 572 ◽  
Author(s):  
S. Nishino ◽  
K. Matsumoto ◽  
Y. Chen ◽  
Y. Nishio
Keyword(s):  
Schottky Diode ◽  
Source Material ◽  
Epitaxial Layers ◽  
Power Devices ◽  
High Quality ◽  
Substrate Quality ◽  
Space Technique ◽  
P Type ◽  
Type Conduction

ABSTRACTSiC is suitable for power devices but high quality SiC epitaxial layers having a high breakdown voltage are needed and thick epilayer is indispensable. In this study, CST method (Close Space Technique) was used to rapidly grow thick epitaxial layers. Source material used was 3C-SiC polycrystalline plate of high purity while 4H-SiC(0001) crystals inclined 8° off toward <1120> was used for the substrate. Quality of the epilayer was influenced significantly by pressure during growth and polarity of the substrate. A p-type conduction was obtained by changing the size of p-type source material. The carrier concentration of epilayer decreased when a lower pressure was employed. Schottky diode was also fabricated.

Desertification or Sustainable Yields from Arid Environments

1988 ◽  
Vol 15 (3) ◽  
pp. 197-204 ◽  
Author(s):  
John L. Cloudsley-Thompson
Keyword(s):  
Third World ◽  
Large Scale ◽  
Agricultural Land ◽  
Agricultural Practices ◽  
Agricultural Products ◽  
Arid Environments ◽  
Multinational Organizations ◽  
Ecological Principles ◽  
The Cost

Throughout their existence, civilized peoples have been turning their environment into desert. The causes of desertification are well known—overgrazing, the felling of trees for fuel, and bad agricultural practices. Their effects are apparent in disasters such as the Sahel drought and recent famines in Ethiopia, the Sudan, and elsewhere. The population explosion enhances the extent of the environmental degradation. More agricultural land is currently being lost through salinization and waterlogging than is being created by new irrigation schemes, but this is only part of a problem that faces all tropical third-world countries and for which multinational organizations and the affluent nations of temperate regions are, regrettably and often unknowingly, largely responsible.Because the poorer countries receive, for their agricultural products, cash of which the market value does not take into account the cost to the environment of overexploiting the land, they are apparently doomed to a vicious circle of increasing poverty, deprivation, and famine. Yet it is not beyond the abilities of civilization to devise a viable scheme, based upon sound ecological principles, by which the quality of life of desert peoples could be immeasurably improved. Instead of trying to change the land to make it conform to present economic and political expectations, development should be adapted to exploit the potentialities of the environment as it exists. Such a scheme, profiting from the diversity of microenvironments that occur in desert regions, would encompass multiple land-use and the development of numerous small agricultural and other projects—rather than the large-scale schemes hitherto initiated in fragile environments, and which have so often led to large-scale disaster. By adopting it, the world would simultaneously be made both more stable and more productive for the benefit of all its inhabitants.

scholarly journals Mutu Pelayanan Radiologi Di Balai Besar Kesehatan Paru Masyarakat (BBKPM) Makassar

Lontara ◽  
2021 ◽  
Vol 2 (2) ◽  
pp. 57-68
Author(s):  
Nurbeti Salam ◽  
Bambang Ariyanto ◽  
Maharani Gayatri
Keyword(s):  
Quality Score ◽  
Environmental Aspects ◽  
High Quality ◽  
Descriptive Research ◽  
Health Support ◽  
Quality Value ◽  
The Cost ◽  
Lung Health ◽  
High Quality Score

Services in the field of radiology which are health support services also need to maintain and improve the quality of their services. Radiology is one of the supporting units of health services in establishing the diagnosis of a disease and also needs to maintain and improve the quality of services appropriately and safely, both for patients (users), radiographers (officers) and the community or the surrounding environment. This study aims to determine the quality of radiology services at the Center for Community Lung Health (BBKPM) Makassar. The method used is descriptive research with a quantitative approach. The population is all patients in the radiology installation of the Center for Community Lung Health (BBKPM) with a sample of 158 people. The results showed that the quality of radiology services in terms of timeliness was categorized as very high, namely 91.86%. The cost of Thorax photo examination services is relatively cheap and affordable and the service waiting time reaches a fairly high-quality value of 86.79%. The information aspect reached a high-quality value, namely 85.97%. The technical executor of the Thorax photo examination is carried out by a radiographer and the executor of the diagnostic results is a radiologist (radiology specialist) who has achieved a fairly high-quality score of 97.15%. Aspects of Human Relations have reached a fairly high-quality score of 87.00%. Environmental Aspects achieved a quality value of 97.57%. It is recommended that the Makassar BBKPM management provide a complaint box (suggestion box) in the radiology room to evaluate services.

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