Академия наук республики узбекистан

INTRODUCTION (abstract of doctoral dissertation as a scientific report) 
Topicality and relevance of the subject of dissertation as a scientific 
report.
To meet the demand of electronic and solar PV productions, manufacturers 
produce a
 
big part of 300MT silicon 
production by hydrogen reduction of chlorine 
compounds. Unfortunately, this technology is power consuming and not ecology
-
safe owing to toxic wastes of production. For this reason, alternative ecology
-safe 
technologies of polysilicon production with low-energy consumption and low cost 
of production are in great demand.
 
 
Considering the growth of silicon demand in next 5 years
5
, it is neccesarry to 
apply a monosilane technology instead of treechlorsilane one in new plants. Since 
the monosilane technology is realized for lower temperatures and has high 
conversion of precursors, it is possible to spare up to 90% of energy in production 
of granulated polysilicon in boiling-layer reactors as compared to the traditional 
Siemens process
. But today monosilane technology which is applied in industry 
aslo based on chlorsilane procceses and requers big CAPEX and still remains not 
ecology-
safe, thats why this problem
still needs a solution. A cardinal solution of 
this problem could be a monosilane technology based on direct reaction of 
metallurgical silicon and low alcohols
. The presence of the induction period in the 
direct reaction of metallurgical silicon and low alcohols prevents the application of 
this technology in the industry. A big knowledge about the mechanism and 
conditions of heterogen catalysis reaction need to solve this problem. A direct 
reaction of metallurgical silicon and low alcohols and disproportionation of 
alcoxysilanes, mechanism of influence of catalysis, activation procces are not 
studied enough. 
A number of works have been done to develop the using renewable energy 
resources in Uzbekistan. For example, starting the company on primary raw 
material of solar energy - metallurgical 
silicone, based on local quartzite.
Compliance of the let
-out metallurgical silicon to re
quirements of electronics and 
solar power requires its repartition through process of deep purification in
to 
polycrystalline silicon and this task waits for its decision. 
Proceeding from this,
devoloping of 
low energy comsumping, ecology
-safe technology of monosilane 
with less capital expenditure is actual in our Republic.
Performance of target 
scientific researches, in particular, researches on Research on the 
development of 
non-chlorine monosilane technology of polycrystalline silicon production and 
creat
ion of processing equipment for its high
-
quality implementation; development 
of ion-stimulated methods for creation of the silicon structures for formation of 
perspective structures of solar elements on the basis of silicon and application of 
these methods
: for increase the level of alloying of silicon structures during their 
growth; for a relaxation of mechanical stress in heterostructures; for formation of 
midget and superdense nanoislands; for manifestation of thermovoltaic properties 
5
Jens Ulltveit-
Moe. REC Silicon 
– 
Nordic Energy Summit 2016, Oslo, 17 March 2016, 
http://hugin.info/136555/R/1995001/734790.pdf
93 

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in silicon structur
es; and also 
the creating the intermediate layers between 
functional coating and substrate are an actual tasks.
The dissertation is devoted to 
a certain extent the tasks specified in the Decree of the President of the Republic of 
Uzbekistan by U
P
-4512 of 
March 1, 2013 "About measures for further 
development of alternative energy sources" and in the Resolution of the President 
of the Republic of Uzbekistan PP
-
1442 "About priorities of development of a 
promydennost of the Republic of Uzbekistan in 2011
-
2015"
of December 15, 2010 
and also in other standard and legal documents accepted in this area.