Fig. 1. Schematic of preparation process of plasmon-enhanced ZnO/ZnSe heterojunction array photodetector

Fig. 2. Microstructure and phase characterization of 1-dimensional (1D) heterojunction nanowire arrays. (a) SEM image of the ZnO nanowires; (b) TEM images of the ZnO/ZnSe heterojunctions; (c) SEM image of the ZnO/ZnSe core-shell heterojunction nanowire arrays enhanced by Ag nanoparticles; (d) X-ray diffraction spectrum of the ZnO/ZnSe heterojunctions; (e) Raman spectra of the ZnO nanowire and ZnO/ZnSe heterojunction

Fig. 3. (a) The chopped I-V curve of 1D heterojunction nanowire array photodetector at −0.8 - 0.6 V bias voltage; (b) Schematic of energy band structure of ZnO/ZnSe heterojunction nanowire array photodetector enhanced by Ag nanoparticles

Fig. 4. (a) Photocurrent diagram of the photodetectors at 100 mW/cm² visible light intensity(@0.8 V); (b) Photocurrent of ZnO/ZnSe heterojunction nanowire array photodetectors reinforced by Ag nanoparticles at different light intensities(@0.4 V)

Fig. 5. UV–vis absorption spectra of the photodetectors

Fig. 6. Nyquist plot of detectors

Fig. 7. (a) Bar graph of average rise time and delay time of photodetector; (b) Transient photocurrent curve of plasma-enhanced ZnO/ZnSe heterojunction nanowire array photodetector(@0.4 V)

Fig. 8. Photoelectric stability curve for photodetector (@0.2 V for 10 h)