TY - JOUR
T1 - Ultraviolet sensor with fast response characteristics based on an AgNW/ZnO bi-layer
AU - Jeon, Mun Bae
AU - Kwak, Yeon Hwa
AU - Ju, Byeong Kwon
AU - Kim, Kunnyun
N1 - Funding Information:
This research was supported by Multi-Ministry Collaborative R&D Program (Development of Techniques for Identification and Analysis of Gas Molecules to Protect Against Toxic Substances) through the National Research Foundation of Korea (NRF) funded by KNPA, MSIT, MOTIE, ME, NFA ( 2017M3D9A1073539 ) and also by the R&D program of MOTIE/KEIT [10064078, Developments of the Multi-Sensor for UV, Ambient Light, and Proximity for Next Smart Device].
Funding Information:
This research was supported by Multi-Ministry Collaborative R&D Program (Development of Techniques for Identification and Analysis of Gas Molecules to Protect Against Toxic Substances) through the National Research Foundation of Korea (NRF) funded by KNPA, MSIT, MOTIE, ME, NFA (2017M3D9A1073539) and also by the R&D program of MOTIE/KEIT [10064078, Developments of the Multi-Sensor for UV, Ambient Light, and Proximity for Next Smart Device].
Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2020/8/15
Y1 - 2020/8/15
N2 - We demonstrate an ultraviolet (UV) sensor with fast response characteristics based on an AgNW/ZnO bi-layer. This UV sensor is a surface acoustic wave (SAW)-based sensor fabricated using a 128°YX black lithium niobate substrate, which is a piezoelectric in nature. This sensor, which is a two-port SAW resonator, was manufactured by fabricating interdigitated electrodes with a wavelength of 16.4 μm and depositing UV sensing layers such as ZnO, Sn/ZnO, and AgNW/ZnO. Among these sensing layers, the frequency response characteristics were found to be improved in the bi-layer structure. In addition, the AgNW/ZnO-based sensor showed a significant improvement in response and recovery times. These results contributed to rapid oxygen adsorption on the ZnO surface due to the large oxygen contact area that can attributed to the AgNW's 3D mesh structure and the compensation of the internal electron trap center due to the contact of the metal-semiconductor. The proposed sensor with the metal-semiconductor bi-layer structure based on AgNW nanomaterials showed the fastest response characteristics compared to previous SAW UV sensors.
AB - We demonstrate an ultraviolet (UV) sensor with fast response characteristics based on an AgNW/ZnO bi-layer. This UV sensor is a surface acoustic wave (SAW)-based sensor fabricated using a 128°YX black lithium niobate substrate, which is a piezoelectric in nature. This sensor, which is a two-port SAW resonator, was manufactured by fabricating interdigitated electrodes with a wavelength of 16.4 μm and depositing UV sensing layers such as ZnO, Sn/ZnO, and AgNW/ZnO. Among these sensing layers, the frequency response characteristics were found to be improved in the bi-layer structure. In addition, the AgNW/ZnO-based sensor showed a significant improvement in response and recovery times. These results contributed to rapid oxygen adsorption on the ZnO surface due to the large oxygen contact area that can attributed to the AgNW's 3D mesh structure and the compensation of the internal electron trap center due to the contact of the metal-semiconductor. The proposed sensor with the metal-semiconductor bi-layer structure based on AgNW nanomaterials showed the fastest response characteristics compared to previous SAW UV sensors.
KW - Acoustoelectric effect
KW - Response characteristics
KW - Silver nanowire
KW - Surface acoustic wave
KW - Ultraviolet
KW - Zinc oxide
UR - http://www.scopus.com/inward/record.url?scp=85085840828&partnerID=8YFLogxK
U2 - 10.1016/j.sna.2020.112044
DO - 10.1016/j.sna.2020.112044
M3 - Article
AN - SCOPUS:85085840828
SN - 0924-4247
VL - 311
JO - Sensors and Actuators, A: Physical
JF - Sensors and Actuators, A: Physical
M1 - 112044
ER -