Technology of obtaining silicon granules

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Sokhibova, Z., & Ibragimova, D. (2022). Technology of obtaining silicon granules. Результаты научных исследований в условиях пандемии (COVID-19), 1(05), 140–142. извлечено от https://inlibrary.uz/index.php/scientific-research-covid-19/article/view/8524
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Аннотация

Silicon granules were obtain based on powder technology. Its raw material was monocrystalline silicon, designed for the solar cell manufacturing industry. Preliminary research have found that silicon granules range in size from 400 nanometers to 1,000 micrometers and have a rough surface

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References:
1. Azizkhodjayeva N. N. Educational technology in teacher training.

Toshkent, 2000, 135 p.

2. Koroleva A. A. Internal needs as a means of motivating learning //

Pedagogical technologies, Moscow, 2005. No. 1. - Pp. 91-95.

3. Markova A. K., Mathis T. A., Orlov A. B. Formation of teaching

motivation. - M., 1990. - 359 p.

Sokhibova Zarnigorkhon Mutalibjon kizi, Ibragimova Dinora Marufjon kizi,

Andijan Machine Building Institute, Uzbekistan

TECHNOLOGY OF OBTAINING SILICON GRANULES.

Sokhibova Z, Ibragimova D

Abstract: Silicon granules were obtain based on powder technology. Its

raw material was monocrystalline silicon, designed for the solar cell
manufacturing industry. Preliminary research have found that silicon
granules range in size from 400 nanometers to 1,000 micrometers and have
a rough surface.

Keywords: silicon granules, powder technology, monocrystalline

silicon, solar cell.

There are many technologies available for the production of micro- and

nanoscale granulated semiconductors. Among them, powder technology is
distinguished by its simplicity compared to others, does not require complex
technological processes. However, one of the disadvantages of powder
technology is that since the preparation of the powder is done by mechanical
methods, the ingress of ingress by the external environment creates various
defects in the size and surface of the material, as a result, the powder is
contaminate in the process from raw material to powder preparation. To
solve these problems, washing and vacuum drying are first carried out to
remove the powder. The powder is then cleaned by a special magnetic
method [2, 4]. The process of obtaining powder is performed in a ceramic
hammer with high hardness and a smooth ball mill with surfaces (Figure
1a).

Cleaning the powder uses a permanent magnetic field, which is

inexpensive because no additional energy is required [5]. To clean the
powder, first a magnet is placed at an angle of 85 degrees and filter paper is
placed on its surface. The powder is applied to the surface of the filter paper
in the required quantities, at a certain distance. The powder is rube with
filter paper and the inserts with magnetic properties remain on the surface
of the paper. The result is a layer of inserts on the surface of the filter paper
(Figure 1b). The process of preservation of magnetic inputs on the surface
of filter paper can be explain as follows.


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Figure 1.a) a mill for powdering crushed crystals; 1 - crushed crystals,
2 - steel balls, 3 - mill walls;
b) magnetic powder cleaning scheme; 1 - permanent magnet, 2 - filter

paper,

3 - powder.
It is known from magnetostatics that the magnetization of permanent

magnets indicates the presence of microcurrents in them. In substances
introduced into the magnetic field, a process of magnetization is observed.
The process of magnetization is a process similar to the process of charging.
This phenomenon is especially strong in metals. When powder is passed
through a magnetic field, the metal particles are magnetized or charged
under the influence of the field. As a result, they are retained on the filter
paper on the magnetic surface. This requires replacing the filter papers
several times and repeating the cleaning process. With each change of filter
paper, the amount of input atoms on the surface of the paper decreases. This
process is performed until the filter paper is 100% clean. In our study, it was
found that replacing the filter papers 4 times was sufficient.


References:
1.

Zainabidinov S.Z, Abdurakhmanov B.M, Aliev R., Olimov L.O,

Mukhtarov E. Production of polycrystalline plates from silicon powder.
Heliotechnics, №3, PP 79-82, 2005.

2.

Olimov L.O. "The grain boundaries of polycrystalline silicon:

microwaves, charge states and r-n-junction". Autoreferaty of doctoral
dissertation. 2016 th.

3.

Olimov L.O, Abdurakhmanov B.M, Teshaboev A. Influence of alkali

metal atoms on transport of charge carriers in the between grain boundaries
of polycrystalline silicon. "Material Science", №1, PP.79-82, 2014.

4.

Olimov L.O.Fundamentals of nanophysics. Study guide. Tashkent,

Yangi Asr Avlodi Publishing House. 2014 y. 140 pages.


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Scientific research results in pandemic conditions (COVID-19)

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5.

Abdurakhmanov B.M, Adilov M.M, Ashurov M.Kh., Ashurov X.B,

Oxygenendler BL. Development and research of silicon isotypic, single and
multijunction thermovoltaic energy converters. Preprint of INP AS RU R-8-
693 Tashkent 2010. P.36


Aslitdin Nizamov, Doctor of Economic Sciences, Professor, Bukhara

Engineering and Technological

Institute, Uzbekistan

Shakhlokhon Gafurova, Master student of Bukhara Engineering and

Technological

Institute, Uzbekistan

DIRECTIONS FOR PROVIDING THE QUALITY OF EDUCATIONAL SERVICES IN

HIGHER EDUCATIONAL INSTITUTES

A.Nizamov, Sh.Gafurova


Abstract. The article looks at the research of the quality of educational

services of higher education institutes. The factors affecting the quality of
education and ensuring the competitiveness of native HEI in the educational
services market are identified and analyzed by the authors. Also the article
clarifies and systematizes various approaches to managing the quality of
educational services to ensure competitiveness in the area of higher
education of the Republic of Uzbekistan.

Key words: quality management, educational services, factors, the

concept of the development of higher education, higher education, total
quality management, modern approaches.

The transition to market relations determines the increase in

requirements for the quality composition of engineering and technical
workers, their level of competence. Without creative engineering, high
professionalism, knowledge of the achievements of science, it is impossible
to create and introduce into production perfect, competitive, high-
performance and economical machines and mechanisms, replace obsolete
equipment with more efficient, up-to-date equipment. Therefore, the
problem of strengthening industry with qualified engineering and technical
personnel is of great importance at the present stage. Indeed, the power of
any developed country largely depends on the quantity and quality of its
engineers, their knowledge, skills, experience, and rational use of their labor.
Therefore, at this time, the problems of improving the quality of specialists
in higher educational institutions are very widely discussed. And the quality
management system of educational organizations is currently one of the
most important mechanisms of internal guarantees of the quality of
education.

Nowadays in our country technologies are being created for clear, stable

and promising higher education assessment procedures. It is worth noting

Библиографические ссылки

Zainabidinov S.Z, Abdurakhmanov B.M, Aliev R., Olimov L.O, Mukhtarov E. Production of polycrystalline plates from silicon powder. Heliotechnics, №3, PP 79-82, 2005.

Olimov L.O. "The grain boundaries of polycrystalline silicon: microwaves, charge states and r-n-junction״. Autoreferaty of doctoral dissertation. 2016 th.

Olimov L.O, Abdurakhmanov B.M, Teshaboev A. Influence of alkali metal atoms on transport of charge carriers in the between grain boundaries of polycrystalline silicon. "Material Science", №1, PP.79-82, 2014.

Olimov L.O.Fundamentals of nanophysics. Study guide. Tashkent, Yangi Asr Avlodi Publishing House. 2014 y. 140 pages.

Abdurakhmanov B.M, Adilov M.M, Ashurov M.Kh., Ashurov X.B, Oxygenendler BL. Development and research of silicon isotypic, single and multijunction thermovoltaic energy converters. Preprint of INP AS RU R-8-693 Tashkent 2010. P.36

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