Comparisons of SnO2 gas sensor degradation under elevated storage and working conditions. (November 2020)

• Record Type: Journal Article
• Authors: Sun, Yongquan; Guo, Jiaying; Qi, Jia; Liu, Bo; Yu, Tianhua
• Is Part Of: Microelectronics and reliability. Volume 114(2020)
• Publication Date: 2020-11
• Subjects: SnO2 gas sensors -- Instability -- Degradation -- Sensitivity -- Recovery time; Electronic apparatus and appliances -- Reliability -- Periodicals; Miniature electronic equipment -- Periodicals; Appareils électroniques -- Fiabilité -- Périodiques; Équipement électronique miniaturisé -- Périodiques; Electronic apparatus and appliances -- Reliability; Miniature electronic equipment; Periodicals; 621.3815
• DOI: 10.1016/j.microrel.2020.113808
• Languages: English
• ISSNs: 0026-2714

Abstract

Abstract: Stability is an important performance indicator for SnO2 gas sensor and is significantly affected by temperature. This paper investigates the effects of temperature during storage and working stages on degradation behaviors of sensors in terms of resistance in air, response time, recovery time and sensitivity. Comparisons of the changes of sensor performance were conducted to identify and understand the differences of the degradation processes between storage and operation stages. The results present that both degradation behaviors and mechanisms differ between under the elevated storage conditions and under the elevated working conditions. The ambient temperature of 80 °C resulted in severely drift on sensor resistance and instability on sensitivity and recovery time due to the surface passivation of SnO2 film. On the contrast, the heating voltage of 5.45 V led to noticeably decrease on sensor resistance but generated relatively stable sensitivity of the SnO2 gas sensors. Highlights: SnO2 gas sensor aging was studied based on resistance, sensitivity, response time, and recovery time. Degradation behaviors and mechanisms differ between under elevated storage and working conditions. The ambient temperature of 80 °C resulted in the most severely impacts on SnO2 sensor degradation. The 5.45 V led to a decline on sensor resistance and a constant trend on sensitivity and recovery time.