Fig. 5. (a) Dark and light I–V curves of p-SiNWs/ITO heterojunction before (black, red) and after (blue, purplish red) 5 ppm NO2 importing respectively, (b) the amplification of the I–V curve in dark condition (c) real-time NO2 detection with different concentrations (ppm) of p-SiNWs/ITO heterojunction (d) the linear relationship between the relative response and concentration, the SINWs etching time was 2 h.
