Polymer Engineering Faculty Research


Neutron Reflectivity Profiling of Hydrogen in Metal-Insulator-Semiconductor Sensors

Document Type


Publication Date

Fall 2008


Although interfacial hydrogen has long been accepted as the species responsible for H2 detection in metal-insulator-semiconductor (MIS) sensors, direct observation of this species has been elusive. In this work, the use of neutronreflectivity (NR) to quantify the hydrogen concentration in regions of an MIS device is reported. The presence of multiple states at both the metal-insulatorinterface and within the insulator that may contribute to the hydrogen response is suggested by the scattering length density profiles obtained from NR. This technique provides a great promise for direct study of the detection mechanisms for MIS sensors.