First International Conference on MOLDAVIAN RISKS – FROM ...
First International Conference on MOLDAVIAN RISKS – FROM ...
First International Conference on MOLDAVIAN RISKS – FROM ...
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<str<strong>on</strong>g>First</str<strong>on</strong>g> <str<strong>on</strong>g>Internati<strong>on</strong>al</str<strong>on</strong>g> <str<strong>on</strong>g>C<strong>on</strong>ference</str<strong>on</strong>g> <strong>on</strong> <strong>MOLDAVIAN</strong> <strong>RISKS</strong> - <strong>FROM</strong> GLOBAL TO LOCAL SCALE<br />
16-19 May 2012, Bacau, Romania<br />
AIIIBVI BASED PHOTOVOLTAIC RECEPTORS FOR<br />
EXPERIMENTAL DETERMINATION OF CARBON<br />
COMPOUNDS IN ATMOSPHERE<br />
Igor Evtodiev 1 , Oxana Racovet 1 , Iuliana Caraman 2 , Marius Stamate 2<br />
1 The Laboratory of Scientific Research "Phot<strong>on</strong>ics and Metrology Physics",<br />
Moldova State University<br />
2 “Vasile Alecsandri” University of Bacau<br />
Corresp<strong>on</strong>ding author: Oxana Racoveţ, racovetoxana@gmail.com<br />
Abstract: C<strong>on</strong>sequently there are emitting enormous quantities of carb<strong>on</strong> toxic compounds<br />
(CO, CO2, CN). The development rhythm of human activity sets significant envir<strong>on</strong>ment<br />
problems. After estimati<strong>on</strong>s made at XX century end [1] humanity uses <strong>on</strong>ly energetic<br />
resources, more than 2*10 17 kJ, except other activities which degrades the envir<strong>on</strong>ment.<br />
That this why it’s an important actuality problem the c<strong>on</strong>trol of atmosphere compositi<strong>on</strong><br />
modificati<strong>on</strong>s through elaborating of new diagnostic methods. In the paper work we<br />
examine the perspective of photovoltaic cells of stratified semic<strong>on</strong>ductors A III B VI using as<br />
light selective receptors. Carb<strong>on</strong> compounds in gaseous stare forms solar radiati<strong>on</strong><br />
absorpti<strong>on</strong> bands into a large spectrum domain (200÷100000) cm -1 . The intensity of<br />
absorbed light in these bands is direct proporti<strong>on</strong>al with the respective molecules<br />
c<strong>on</strong>centrati<strong>on</strong>, but the frequency corresp<strong>on</strong>ding to the maximals of these bands are values<br />
characteristic to absorbed molecules. Thus by light intensity measuring from sun spectrum<br />
(or another light source) is obtained the informati<strong>on</strong> about the light type and absorpti<strong>on</strong><br />
c<strong>on</strong>centrati<strong>on</strong>. The main scheme of an optic measurement of gases c<strong>on</strong>sists of the light<br />
source and a selective receptor of radiati<strong>on</strong>. The identificati<strong>on</strong> accuracy of the molecules<br />
type from the column through which is spreading the radiati<strong>on</strong> is determined by the width<br />
of the light outline band recorded and by the integral sensibility. Fundamental absorpti<strong>on</strong><br />
bands of CO, CO2, CN carb<strong>on</strong>ate are in domain of IR medium (1000÷3500) cm -1 . The<br />
harm<strong>on</strong>ics from the superior order of these gases atoms vibrati<strong>on</strong> are at the red limit of the<br />
visible (780÷900) nm, regi<strong>on</strong> which correlates well with fundamental absorpti<strong>on</strong> band of<br />
indium selenide. In the paper work is studded the dependence of the photocurrent<br />
generated by the heterojuncti<strong>on</strong> In2O3-InSe with interferential filter (Δλ=12 nm)<br />
independence of the CO and CN molecules c<strong>on</strong>centrati<strong>on</strong> in normal atmosphere. It was<br />
established that for the light source of A (T=2870 K) type, InSe- In2O3 receptor and filter<br />
with the width 12 nm at λ0=798,5 nm is obtaining a photocurrent linear dependence of CO<br />
molecules pressure in (10÷100) mm Hg limits. Investigati<strong>on</strong>s were made in the Laboratory<br />
of Scientific Research "Phot<strong>on</strong>ics and Metrology Physics", Moldova State University.<br />
Key words: absorpti<strong>on</strong> band, receptor, sensibility, energy, light.<br />
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