Title :
A new Pt/oxide/In/sub 0.49/Ga/sub 0.51/P MOS Schottky diode hydrogen sensor
Author :
Liu, Wen-Chau ; Lin, Kun-Wei ; Chen, Huey-Ing ; Wang, Chih-kai ; Cheng, Chin-Chuan ; Cheng, Shiou-Ying ; Lu, Chun-Tsen
Author_Institution :
Dept. of Electr. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan
Abstract :
A new and interesting Pt/oxide/In/sub 0.49/Ga/sub 0.51/P metal-oxide-semiconductor (MOS) Schottky diode hydrogen sensor has been fabricated and studied. The steady-state and transient responses with different hydrogen concentrations and at different temperatures are measured. The presence of dipoles at the oxide layer leads to an extra electrical field and the variation of Schottky barrier height. Even at room temperature, a very high hydrogen detection sensitivity of 561% is obtained when a 9090 ppm H/sub 2//air gas is introduced. In addition, an absorption response time less than 1 s under the applied voltage of 0.7 V and 9090 ppm H/sub 2//air hydrogen ambient is found. The roles of hydrogen adsorption and desorption for the transient response at different temperatures are also investigated.
Keywords :
III-V semiconductors; MIS devices; Schottky barriers; Schottky diodes; adsorption; desorption; gallium compounds; gas sensors; hydrogen; indium compounds; platinum; sensitivity; transient response; 0.7 V; 1 s; H; H adsorption; H desorption; H/sub 2/; H/sub 2/ sensor; Pt; Pt/oxide/In/sub 0.49/Ga/sub 0.51/P MOS Schottky diode; Schottky barrier height variation; Schottky diode hydrogen sensor; absorption response time; high detection sensitivity; steady-state response; transient response; Absorption; Delay; Hydrogen; Lead compounds; Schottky barriers; Schottky diodes; Steady-state; Temperature measurement; Temperature sensors; Voltage;
Journal_Title :
Electron Device Letters, IEEE
DOI :
10.1109/LED.2002.805006
