A solution-processed octahedral nano-blocks structure CaInSfilm for UV/vis photodetection.

A novel CaInSwith three-dimensional octahedral nano-blocks (ONBs) are successfully synthesized on fluorine-doped tin oxide (FTO) substrate by a simple hydrothermal method. The CaInSONBs are uniform grown and scattered on the whole FTO substrate with high regular and symmetric morphology as well as average diagonal length of about 600 nm. Based on the as-synthesized CaInSONBs, a photodetector (PD) is fabricated. Satisfyingly, it is found that the CaInSONBs PD achieves a broad-band response ranging from ultraviolet (UV) to visible ( vis) light at zero bias voltage. It is also significant that the CaInSONBs PD enables a fast response, in which the rise time and decay time are less than 0.15 and 0.2 s, respectively. Furthermore, the morphological evolution of the CaInSONBs and plausible UV/vis detection mechanism of the CaInSONBs PD are discussed.