1 research outputs found
Quantum Size Effects on the Chemical Sensing Performance of Two-Dimensional Semiconductors
We investigate the role of quantum confinement on the
performance
of gas sensors based on two-dimensional InAs membranes. Pd-decorated
InAs membranes configured as H<sub>2</sub> sensors are shown to exhibit
strong thickness dependence, with ∼100× enhancement in
the sensor response as the thickness is reduced from 48 to 8 nm. Through
detailed experiments and modeling, the thickness scaling trend is
attributed to the quantization of electrons which favorably alters
both the position and the transport properties of charge carriers;
thus making them more susceptible to surface phenomena