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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:31 |
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Conference: Bucharest University Faculty of Physics 2012 Meeting
Section: Atomic and Molecular Physics; Astrophysics
Title:
Photonic thermometer characterised by alpha particles spectrometry
Authors:
D.PALADE, V.BERCU, M.BERCU
Affiliation:
Faculty of Physics, University of Bucharest, Magurele, P.O.Box MG-11, Romania
E-mail
mircea_bercu2@yahoo.com
Keywords:
Silicon based sensors, alpha particles spectrometry, photovoltaics.
Abstract:
This study investigates the temperature dependence of the photovoltaic generation of the silicon photodiode to be used as a photonic thermometer. The linear response of the photonic thermometer was determined in the range of 200C – 1000C. The resulted slope is about 2,2mV/0C. The accuracy of temperature determination obtained by using the experimental setup is about +/- 0.010C but it can be improved by assembly optimisation. The linear dependency between Voc (voltage of open circuit) and temperature was tested in different light fluxes emitted by laser diodes. The measurements were carried out using monochromatic light at wavelength of 532nm and 650nm. The enhancement of the electric signal at low light fluxes was obtained in the case of special designed p+/n diode with a supplementary n+ doped region beneath the junction, at a distance lower than the diffusion length of the minority carriers. The effectiveness of this improvement can be revealed by “alpha particle sensitivity” technique. This method uses non-equilibrium electric carriers generation by alpha particles up to a specific depth into p+/n junction, being controlled by changing the energy lost in air according to 210Po source - detector distance. The spectra of the electric pulses generated by the sensor shows two type of signals related to drift and diffusion mechanisms of electric charges collection. These results indicate an increasing in sensitivity of 65%, given by the n+ Si doped layer built below the space charge region of the junction.
Note: This work was supported by the strategic grant POSDRU/89/1.5/S/58852, Project "Postdoctoral programme for training scientific researchers" co-financed by the European Social Fund within the Sectorial Operational Program for Human Resources Development 2007 – 2013.
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