Self-Powered Broadband Photodetectors Material Based on Co3O4-ZnO Heterojunction with Bottlebrush Nanostructure

Self-powered broadband photodetectors operating in theultraviolet-visiblewindow are essential for optical communication, military monitoring,multispectral detection, and environmental monitoring. In this study,a new bottlebrush nanostructure based on the Co3O4-ZnO PN junction is fabricated as an efficient broadband photodetectorcapable of operation under zero bias conditions. This photodetectorhas a reasonable band structure, exhibits improved efficiency of lightabsorption, and features reduced electron-hole recombination.Moreover, the device exhibits highly efficient detection performancein the UV-visible region. The responsivity (R), specific detectivity (D), and response speedof the device were 22.7 mA W-1, 3.14 x 10(12) Jones, and 20/90 ms, respectively. These results suggesta new strategy for fabricating broadband photodetectors based on stable,nontoxic, low-cost metal oxides.