Recent Progress in Ohmic/Schottky-Contacted ZnO Nanowire Sensors

Figure 10

(a) I-V curves measured for the ohmic-contacted device in N₂ and O₂ atmospheres at 275°C. Inset shows the schematic of a typical ohmic-contacted gas sensor. (b) The response curves of the oxygen detection recorded at different temperatures, ranging from 150 to 300°C, for the ohmic-contacted device. The blue background denotes that the sensor was in the N₂ atmosphere and the pink background in the O₂ atmosphere. (c) I-V curves of the Schottky-contacted device measured at different temperatures in N₂ atmosphere. Inset shows the equivalent circuit of a Schottky-contacted gas sensor. (d) I-V curves of the Schottky-contacted device measured at different temperatures in O₂ atmosphere. (e) Response curves of the oxygen detection recorded at different temperatures, ranging from 150 to 300°C, for the Schottky-contacted device operated under forward bias. (f) Response curves of the oxygen detection recorded at different temperatures, ranging from 150 to 300°C, for the Schottky-contacted device operated under reverse bias [70]. Copyright 2009, American Chemical Society.

(a)

(b)

(c)

(d)

(e)

(f)