High-performance flexible photodetectors based on single-crystalline Sb2Se3 nanowires†
Antimony selenide (Sb2Se3) has many potential applications in photoelectric devices, thermoelectric cooling devices and electrochemical devices etc. It also has many special properties due to its layered structure. A simple hydrothermal method was used to synthesize Sb2Se3 nanowires of high crystalline quality. (Sb4Se6)n layers are parallel to the growth direction of the Sb2Se3 nanowire. A single Sb2Se3 nanowire demonstrated a remarkable response to 635 nm light at 10 V with the responsivity and external quantum efficiency of 360 A W−1 and 7.0 × 104%, respectively. The rise/fall time was 0.4/1.3 s. Flexible photodetectors were fabricated by dispersing a large number of Sb2Se3 nanowires onto the Au interdigitated electrodes on PET substrates, which showed a fast response speed with the rise/fall time as low as 13/20 ms and excellent flexibility. The high-performance of the photodetectors may be partially attributed to the layered structure. Generally, high-yield Sb2Se3 nanowires synthesized by the hydrothermal method are promising candidates for high-performance flexible photodetectors.