Fig. 1. Topography, structure and absorption properties of different samples. (a) SEM topography of pure BFO film; (b) SEM topography of BFO/C/Au composite film; (c) X-ray diffraction diagram of pure BFO film;(d) absorption spectra of films with different structures

Fig. 2. Photocurrent curves and charge transfer diagram of composite structure. (a) Photocurrent curves of films with different structures; (b) charge transfer diagram of Au/C/BFO/C/Au double plasmon composite structure

Fig. 3. Photocurrent curves of films with different structures under forward polarization and reverse polarization. (a) Forward polarization; (b) reverse polarization