DocumentCode :
406012
Title :
Noncooled InAs photodiodes for optoelectonic sensors of methane
Author :
Khivrych, V. ; Olijnyk, G. ; Sukach, A. ; Tetyorkin, V. ; Rubay, M. ; Oshchudlyak, S.
Author_Institution :
Inst. for Nucl. Res., NAS, Kyiv, Ukraine
Volume :
1
fYear :
2003
fDate :
22-24 Oct. 2003
Abstract :
Modern optoelectronic gaseous sensors require high performance photodetectors for mid-wavelength infrared (IR) region because of the most intensive absorption lines of carbons, which are the structural units of pollutant gases, fall into the wavelength region 3.2-3.4 μm. The most effective sources of IR radiation in this spectral region are LEDs made of p-n-InGaAs/n-InAs and p-n-InAsSbP/n-InAs heterostructures. To be successfully used in optoelectronic gaseous sensors IR photodiodes should exhibit high sensitivity and operating speed. In many cases these photodiodes should be also explosion proof. The carrier transport mechanisms were investigated in the temperature range 77-330 K. At actual temperatures T=260-300 K the forward current is determined by two mechanisms: diffusion in the bulk and generation in the depletion region. In photodiodes with p-n junction depth h=6÷7 μm the photoresponse spectra has maximum at λmax=3.3÷3.5 μm (T=295 K). These dependencies are well coincide with LEDs spectra λ=3.3 μm. In investigated photodiodes the current responsivity was ranged from 0.7 to 0.8 A×W-1 at the wavelength 3.3 μm. The specific detectivity Dλ (3.3 μm, 800 Hz, 1 Hz) was found to be in the range 3.0÷ 3.5×109 W-1 cm Hz12/ at T=295 K. These threshold parameters exceed analogous ones in commercially available photodiodes.
Keywords :
III-V semiconductors; carrier mobility; gallium arsenide; gas sensors; indium compounds; infrared spectra; optoelectronic devices; p-n heterojunctions; photodiodes; 1 Hz; 1 MHz; 260 to 300 K; 295 K; 3.2 to 3.4 micron; 3.3 micron; 77 to 330 K; 800 Hz; IR photodiodes; IR radiation; InAsSbP-InAs; InGaAs-InAs; LED spectra; absorption line; carrier transport mechanism; current responsivity; forward current; methane; mid-wavelength infrared region; noncooled InAs photodiode; optoelectronic gaseous sensors; p-n junction depth; p-n-InAsSbP-n-InAs heterostructures; p-n-InGaAs-n-InAs heterostructures; photodetector; photoresponse spectra; specific detectivity; Carbon dioxide; Electromagnetic wave absorption; Gas detectors; Infrared sensors; Light emitting diodes; Optoelectronic and photonic sensors; Photodetectors; Photodiodes; Temperature distribution; Temperature sensors;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Sensors, 2003. Proceedings of IEEE
Print_ISBN :
0-7803-8133-5
Type :
conf
DOI :
10.1109/ICSENS.2003.1278906
Filename :
1278906
Link To Document :
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