Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 318, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2020.128087
Keywords
Resistor-type gas sensor; FET-type gas sensor; Low frequency noise (LFN); 1/fnoise; Gas to Air Noise Ratio (GANR)
Funding
- Brain Korea 21 Plus Project in 2019
- National Research Foundation of Korea [NRF-2016R1A2B3009361]
- National Research Foundation of Korea [4120200113758] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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By analyzing the Low Frequency Noise (LFN) characteristics of the resistor-type and the Si metal oxide semiconductor Field Effect Transistor (FET)-type gas sensors fabricated on the same wafer, the intrinsic device noise and the additional noise generated from the gas reaction are systemically examined. Sensing material, n-type Indium-Oxide (In2O3) film, is deposited using the radio frequency magnetron sputtering method. Unlike the FETtype gas sensor, the LFN characteristics of the resistor-type gas sensor are affected by the deposition condition of the sensing material. It is shown that the FET-type sensor has at least 10 times less LFN power than the resistortype gas sensor despite its smaller size. Gas to Air Noise Ratio (GANR) is introduced as a new figure of merit to evaluate and compare the LFN characteristics during the gas reaction in both resistor- and FET-type gas sensors with the sensing layer prepared by different process conditions. The GANRs of the resistor-type sensors range from similar to 2 to 4, which demonstrates that the reaction between the gas molecules and the sensing material generates a fluctuation that exceeds the intrinsic noise of devices. However, the FET-type gas sensors have a constant value of GANR (similar to 1) regardless of the operation region, showing that the FET-type gas sensors have better performance in terms of noise.
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