Fig. 4: Zero-bias transmissions and I–V curves of all gas molecules on 313-junction.
From: Electronic fingerprint mechanism of NOx sensor based on single-material SnP3 logical junction
a Atomic structure of 313-junction with 1L SnP3 transport channel and 3L SnP3 electrodes. The device model is constructed with 3L SnP3 electrodes (highlighted with blue and orange rectangles), overlap regions of 3L SnP3 as buffers, and a 1L SnP3 transport channel. b Zero-bias transmission function, T(E, V = 0) of 313-junction with type A (top) and type B (bottom) molecules adsorbed on top of the transport channel (T(E, V = 0) of the pristine SnP3 313-junction is shown in grey shaded area for comparison), and c corresponding I–V curves. Grey, red, blue, and magenta downwards arrows indicate the electronic states originating from SnP3, CO2, and NO, and the NO2-induced suppression of the T(E, V = 0) peak near EF, respectively. The I–V curve for the pristine 313-junction is marked as grey lines (see Supplementary Fig. 7). Grey downward arrows indicate the three notable bias voltages in describing NDR, namely, base (VB = 0.25 V), peak (VP = 0.50 V), and valley (VV = 0.75 V) points. d Bias-dependent transmission functions, T(E, V), for VB, VP, and VV with the case of NO molecule. For each bias, green and grey downwards triangles correspond to the transmission eigenchannel inside and outside of the bias window (marked as the green shaded area), respectively. The eigenchannels are labelled to simplify the convention \(E_{{{{\mathrm{bias}}}}\,{{{\mathrm{voltage}}}}}^{{{{\mathrm{eigen}}}}\,{{{\mathrm{energy}}}}}\) as α\(\left( {E_{0.25\,{{{\mathrm{V}}}}}^{0.0\,{{{\mathrm{eV}}}}}} \right)\), β\(\left( {E_{0.50\,{{{\mathrm{V}}}}}^{0.18\,{{{\mathrm{eV}}}}}} \right)\), γ\(\left( {E_{0.50\,{{{\mathrm{V}}}}}^{0.35\,{{{\mathrm{eV}}}}}} \right)\), δ\(\left( {E_{0.75\,{{{\mathrm{V}}}}}^{0.15\,{{{\mathrm{eV}}}}}} \right)\), and ε\(\left( {E_{0.75\,{{{\mathrm{V}}}}}^{0.52\,{{{\mathrm{eV}}}}}} \right)\) and are spatially visualized in e.
