Gallium-Zinc-Oxide for Highly Stable Room-Temperature Gas Sensors
Supporting Information
Low-Temperature Photochemically Activated Amorphous IndiumGallium-Zinc-Oxide for Highly Stable Room-Temperature Gas Sensors Rawat Jaisutti1,2, Jaeyoung Kim3, Sung Kyu Park4,*, and Yong-Hoon Kim2,3,* 1
Department of Physics, Faculty of Science and Technology, Thammasat University, Pathumthani, Thailand
2
School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon, Korea
3
SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon, Korea 4
School of Electrical and Electronic Engineering, Chung-Ang University, Seoul, Korea
*Corresponding authors: Sung Kyu Park ([email protected]) Yong-Hoon Kim ([email protected])
S-1
Figure S1. A schematic diagram of an automated gas measurement system.
Figure S2. (a) I-V characteristics of the IGZO sensor under dark conditions and under different UV intensities, measured after 180 s light irradiation (inset shows the magnification of I-V curve at dark conditions); (b) the extracted current response of an IGZO sensor (at 5 V applied voltage) as a function of power intensity.
a
b 240
0.007 0.000 -0.007 -0.014
0
-4
-2
0 2 Voltage (V)
-2
30 mW cm -2 10 mW cm -2 1 mW cm dark
-80 -160 -240
4
-4
-2
0 2 Voltage (V)
Photocurrent (A)
80
Current (µΑ)
Current (µΑ)
160
1000
0.014
100
10 1
4
10
100 -2
Power Intensity (mW cm )
S-2
Figure S3. The overall response current behavior (I vs. t) of an IGZO gas sensor operated under UV intensity of 30 mW cm-2 in a log-scale (acetone gas concentration of 750 ppm).
10000
-2
UV (30 mW cm )
Output Current (µA)
1000 100 10
photocurrent
1 0.1 0.01 0
UV on
240
480 720 Time (s)
960 1200
Figure S4. The overall percentage relative humidity (%RH) and temperature inside the measurement chamber for the IGZO gas sensor, while operated under UV intensity of 30 mW
80 o
Temp. ( C) Humidity (% RH)
o
Humidity, Temp. (% RH, C)
cm-2 and acetone gas concentration of 750 ppm.
70 60 50 40 30 20
0
240 480 720 960 1200
Time (s)
S-3
Figure S5. (a) The overall response current behavior of an IGZO gas sensor exposed to dry air (without analyte gas) operated under UV intensity of 30 mW cm-2, and (b) a magnified view in the time range between 600 ~ 840 sec.
a
b 300 264
150 100 50 UV on
0
0
240
480
720
960
262 ∆I ~ 0.7 µA
260 258 256 600
1200
660
720
Time (s)
Time (s)
S-4
Dry air in (without analyte gas)
Output Current (µA)
200 Dry air in (without analyte gas)
Output Current (µA)
UV off
250
780
840
Low-Temperature Photochemically Activated Amorphous IndiumGallium-Zinc-Oxide for Highly Stable Room-Temperature Gas Sensors Rawat Jaisutti1,2, Jaeyoung Kim3, Sung Kyu Park4,*, and Yong-Hoon Kim2,3,* 1
Department of Physics, Faculty of Science and Technology, Thammasat University, Pathumthani, Thailand
2
School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon, Korea
3
SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon, Korea 4
School of Electrical and Electronic Engineering, Chung-Ang University, Seoul, Korea
*Corresponding authors: Sung Kyu Park ([email protected]) Yong-Hoon Kim ([email protected])
S-1
Figure S1. A schematic diagram of an automated gas measurement system.
Figure S2. (a) I-V characteristics of the IGZO sensor under dark conditions and under different UV intensities, measured after 180 s light irradiation (inset shows the magnification of I-V curve at dark conditions); (b) the extracted current response of an IGZO sensor (at 5 V applied voltage) as a function of power intensity.
a
b 240
0.007 0.000 -0.007 -0.014
0
-4
-2
0 2 Voltage (V)
-2
30 mW cm -2 10 mW cm -2 1 mW cm dark
-80 -160 -240
4
-4
-2
0 2 Voltage (V)
Photocurrent (A)
80
Current (µΑ)
Current (µΑ)
160
1000
0.014
100
10 1
4
10
100 -2
Power Intensity (mW cm )
S-2
Figure S3. The overall response current behavior (I vs. t) of an IGZO gas sensor operated under UV intensity of 30 mW cm-2 in a log-scale (acetone gas concentration of 750 ppm).
10000
-2
UV (30 mW cm )
Output Current (µA)
1000 100 10
photocurrent
1 0.1 0.01 0
UV on
240
480 720 Time (s)
960 1200
Figure S4. The overall percentage relative humidity (%RH) and temperature inside the measurement chamber for the IGZO gas sensor, while operated under UV intensity of 30 mW
80 o
Temp. ( C) Humidity (% RH)
o
Humidity, Temp. (% RH, C)
cm-2 and acetone gas concentration of 750 ppm.
70 60 50 40 30 20
0
240 480 720 960 1200
Time (s)
S-3
Figure S5. (a) The overall response current behavior of an IGZO gas sensor exposed to dry air (without analyte gas) operated under UV intensity of 30 mW cm-2, and (b) a magnified view in the time range between 600 ~ 840 sec.
a
b 300 264
150 100 50 UV on
0
0
240
480
720
960
262 ∆I ~ 0.7 µA
260 258 256 600
1200
660
720
Time (s)
Time (s)
S-4
Dry air in (without analyte gas)
Output Current (µA)
200 Dry air in (without analyte gas)
Output Current (µA)
UV off
250
780
840
