Fig. 1. Schematic diagram of preparation process of ZnO/Spiro-MeOTAD heterojunction

Fig. 2. Morphology characterizations of ZnO/Spiro-MeOTAD and ZnO films

Fig. 3. XRD patterns， Raman spectra， UV-Vis light absorption spectra and band gap of ZnO， Spiro-MeOTAD and ZnO/Spiro-MeOTAD

Fig. 4. I-V curves， I-t curves and single-cycle I-t curves with rise and fall time of ZnO/Spiro-MeOTAD and ZnO devices

Fig. 5. Responsivity and specific detectivity of ZnO and ZnO/Spiro-MeOTAD devices and energy band arrangement of ZnO/Spiro-MeOTAD devices before contact and after illumination

Fig. 6. I-t curves of ZnO/Spiro-MeOTAD-O and ZnO/Spiro-MeOTAD after placement for different times and at different temperatures