Rational Design of Comb-Like 1D-1D ZnO-ZnSe Heterostructures Toward Its Excellent Performance on Flexible Photodetector

Abstract

One-dimensional(1D) Zn-based heterostructures have attracted considerable interest in the field of photodetection because of tunable properties, flexibility, and unique optoelectronic properties. However, designing 1D multi-component Zn-based heterostructures in advanced photodetectors is still a great challenge. Herein, comb-like 1D1D ZnOZnSe heterostructures with ZnO and ZnSe nanowires (NWs) comprising the shaft and teeth of a comb are reported. The length of the ZnO NWs is modulated in the range of 3001200 nm. Microstructural characterizations indicate that the 1D heterostructure clearly showed the spatial distribution of individual components. The well-designed structure displays an extended band photoresponse and higher photosensitivity than pure ZnSe NWs. Further, ZnSe NWs with an appropriate length of ZnO branches show increased photoresponse of 3835 % and 798 % than that of pure ZnSe NWs under green and red-light irradiation, respectively. In addition, the integrated flexible photodetector presents excellent folding endurance after 1000 bending tests. This well-designed structure has significant potential for other 1D-based semiconductors in optoelectronic applications.