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- W1965373338 abstract "The response to ammonia of silicon-based Metal Oxide Semiconductor Field Effect Transistor (MOSFET) devices having either evaporated or sputtered Pt gate electrodes has been studied. A substantial difference in ammonia sensitivity was observed between these two types of device, which is thought to be related to differences in morphology between the two types of gate electrode; devices having evaporated Pt gate electrodes, which are non-continuous, are very ammonia sensitive, whereas devices having sputtered Pt gates, which are continuous, are not ammonia sensitive. However, both the evaporated and sputtered gate devices exhibit a similar response to hydrogen (typically, changes in threshold voltage (VT) of approximately -420 mV and -350 mV respectively to 500 ppm hydrogen at 150 °C). The ammonia sensitivity of the evaporated Pt-gate MOSFET is dependent on both temperature and ageing effects; the optimum operating temperature of this device is 175 °C, and a burn-in period of approximately 48 h at 200 °C is necessary before the maximum response to ammonia is observed. The humidity response of both evaporated and sputtered Pt-gate MOSFET devices has been studied at 175 °C; a change from 20 to 95% r.h. does not produce a significant response from either of these devices (ΔVT is typically -35 mV and -5 mV respectively)." @default.
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- W1965373338 date "1987-01-01" @default.
- W1965373338 modified "2023-10-01" @default.
- W1965373338 title "The ammonia sensitivity of platinum-gate MOSFET devices: dependence on gate electrode morphology" @default.
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- W1965373338 doi "https://doi.org/10.1016/0250-6874(87)85006-0" @default.
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