Self-powered dual-wavelength polarization-sensitive photodetectors based on ZnO/BiFeO3 heterojunction

•ZnO/BiFeO3 heterojunction photodetectors demonstrate self-powered, dual-wavelength and polarization-sensitive photoresponse at ultraviolet and visible regions.•Tuning of the built-in electric field (Ebi) at the ZnO/BiFeO3 heterojunction interface and the spontaneous polarization ferroelectric field (EPS) of BiFeO3 by optimizing the thickness of the BiFeO3 films.•Expanding photodetectors array cells for polarization light imaging applications using the polarization-sensitive properties of BiFeO3 films.