Self-Powered, Ultrafast CuO Nanocube Surface for Broadband Photosensing Applications

The advancement of the portable optoelectronic platform has opened a significant research interest toward self-powered photosensing devices. This article presents ultrafast broadband self-powered photosensing devices using copper oxide (CuO) nanocubes as a sensing layer. The proposed CuO synthesis and device fabrication processes are wafer scalable for mass production. The photosensing performance of the CuO nanocube-based device was tested for broadband wavelength spectrum [ultraviolet (UV)-near infrared (NIR)]. These fabricated broadband photodetectors have shown enhanced performance parameters such as selectivity, sensitivity, stability, speed, and scalability. The photodetector offers a photo-to-dark current ratio (PDCR) of 4.18 x 10(2), a photosensitivity of similar to 2 x 10(3), and a detectivity of 7.8 x 10(10) Jones at 880 nm. In addition, the devices are self-powered with a significant PDCR and photosensitivity. This broadband photosensing device exhibits highly repeatable, reliable, and reproducible results with an ultrafast switching speed of 81.4/81.4 mu s. The stability of the device has been tested using transient analysis for 500 cycles at room temperature. The proposed broadband photosensing devices can be deployed for next-generation self-powered portable systems.