TY - JOUR
T1 - Group III-nitride-based gas sensors for combustion monitoring
AU - Schalwig, J.
AU - Müller, G.
AU - Eickhoff, M.
AU - Ambacher, O.
AU - Stutzmann, M.
PY - 2002/5/30
Y1 - 2002/5/30
N2 - The paper reports on novel gas-sensing devices based on group III-nitride materials. Both platinum (Pt)-GaN Schottky diodes as well as high-electron-mobility transistors formed from GaN/AlGaN heterostructures with catalytically active platinum gates were investigated. The performance of these devices towards a number of relevant exhaust gas components such as H2, HC, CO, NOx was tested. Test gas concentrations were chosen to simulate exhaust gas emissions from lean-burn 4-stroke petrol engines. We found that GaN-based devices with platinum electrodes are mainly sensitive to hydrogen and unsaturated hydrocarbons with a sizeable cross-sensitivity to CO and NO2. These performance characteristics are similar to those of comparable SiC devices. With GaN devices this performance, however, can be obtained at a reduced complexity of the device processing and a greater freedom in the choice of sensor architectures.
AB - The paper reports on novel gas-sensing devices based on group III-nitride materials. Both platinum (Pt)-GaN Schottky diodes as well as high-electron-mobility transistors formed from GaN/AlGaN heterostructures with catalytically active platinum gates were investigated. The performance of these devices towards a number of relevant exhaust gas components such as H2, HC, CO, NOx was tested. Test gas concentrations were chosen to simulate exhaust gas emissions from lean-burn 4-stroke petrol engines. We found that GaN-based devices with platinum electrodes are mainly sensitive to hydrogen and unsaturated hydrocarbons with a sizeable cross-sensitivity to CO and NO2. These performance characteristics are similar to those of comparable SiC devices. With GaN devices this performance, however, can be obtained at a reduced complexity of the device processing and a greater freedom in the choice of sensor architectures.
KW - Combustion monitoring
KW - GaN
KW - GaN/AlGaN-heterostructures
KW - Gas sensors
UR - http://www.scopus.com/inward/record.url?scp=0037198538&partnerID=8YFLogxK
U2 - 10.1016/S0921-5107(02)00050-8
DO - 10.1016/S0921-5107(02)00050-8
M3 - Article
AN - SCOPUS:0037198538
SN - 0921-5107
VL - 93
SP - 207
EP - 214
JO - Materials Science and Engineering B: Solid-State Materials for Advanced Technology
JF - Materials Science and Engineering B: Solid-State Materials for Advanced Technology
IS - 1-3
ER -