Humidity Sensing Characteristics of Tin Oxide Thin Film Gas Sensors Varying with the Operating Voltage

In this paper, the tin oxide thin film gas sensors were successfully manufactured under a certain process condition and the humidity sensing properties of the devices varying with the operating voltage were tested. To begin with, a model of the gas sensor was built and simulated to determine the steady-state temperature distributions of the whole device and the gas sensing film using ANSYSTM. Then X-ray photoelectron spectroscopy (XPS) was used to analyze the composition of the tin oxide film fabricated under the specific process condition, showing that it has a high oxygen content. At last the humidity sensing characteristics of the devices at different operating voltages were tested. A conclusion can be drawn from the experimental results that the humidity sensitivity of the gas sensors can be enhanced from 1.429E-2 to 4.651E-2 when the operating voltage is increased from 3.000 V to 4.000 V and can be reduced from 4.651E-2 to 4.077E-3 when the operating voltage is increased from 4.000 V to 5.000 V.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000319824700243&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Engineering, Electrical & ElectronicPhysics, AppliedEICPCI-S(ISTP)