Dr. Khafiz M. Salikhov Profile

Dr. Khafiz M. Salikhov

Member of the Board of Directors at LED Microsensor NT LLC

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Proceedings Article | 7 March 2014 Paper

Super low power consumption middle infrared LED-PD optopairs for chemical sensing

Nikolay Stoyanov, Khafiz Salikhov, Karina Kalinina, Sergey Kizhaev, Anton Chernyaev

Proceedings Volume 8982, 89821A (2014) https://doi.org/10.1117/12.2036277

KEYWORDS: Photodiodes, Light emitting diodes, Heterojunctions, Indium arsenide, Indium arsenide antimonide phosphide, Infrared radiation, Mid-IR, Palladium, Sensors, Optical sensors

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The new photodiodes with cut-off wavelengths at 3640 nm, 4600 nm and 5150 nm have been recently developed in a high-tech company LED Microsensor NT (St.Petersburg, Russia) in cooperation with Aalto University (Espoo, Finland). Photodiode (PD) heterostructures InAsSb/InAsSbP were grown by MOVPE on InAs substrates. For the PDs with a cutoff wavelength at 3640 nm at room temperature the responsivity at 3300 nm reached 1.46 A/W and, detectivity was 1.56*10¹⁰ cm.Hz^1/2/W. For the PDs with a cut-off 4600 nm the same parameters were: 1.91 A/W and 6.7*10⁹ cm.Hz^1/2/W respectively (lambda=4100 nm). For the third type of PDs with a cut-off at 5150 nm responsivity was 0.29 A/W, detectivity was 4.2*10⁸ cm.Hz^1/2/W (lambda=5000 nm). Creation of photodiodes for the spectral range 2500-5200 nm with acceptable efficiency in photovoltaic operation mode (with no reverse bias) and using them in a pair with spectrally matched LEDs driven by very short current pulses allows developing optical cells with very low power consumption (less than 1 mW). Small size of the LED and PD dies (0.4-0.8 mm) and low heating makes it possible to design very thin optical cells (less than 2 mm) for measuring CH4, CO2, CO, H2O and other substances [1]. Mounting of a few LED dies that emit at different wavelengths in such a small cell allows measuring different chemical substances simultaneously. Direct coating of optical filters on the LED or PD surface during post-growth process allows improving selectivity and sensitivity of the sensor. Super low power consumption of the diode-based optical cells makes them promising candidates for the wireless mesh sensor networks for various gas monitoring purposes as well as for HVAC systems. Combination of the low power consumption and thin size of the cells opens possibility to embed them in mobile devices.

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