Self Powered Highly Enhanced Dual Wavelength ZnO@CdS Core-Shell Nanorod Arrays Photodetector: An Intelligent Pair

On the face of the impending energy crisis; developing low-energy or even zero-energy photoelectronic devices is extremely : important. A multispectral photo, sensitivity feature of a self-powered device provides an additional powerful tool. We have developed an unprecedented high performance dual wavelength self,powered ZnO@CdS/PEDOT:PSS core-shell nanorods array photodetector through a simple aqueous chemical method wherein a Suitable band alignment between an intelligent material pair, i.e. ZnO and CdS, has been utilized. Besides a noteworthy advantage Of the devices being that they show a very sharp and prominent dual wavelength photosensitivity, both the ultraviolet and visible light sensitivity (ratio of current under illumination(I-photo)/current under dark (I-dark)) of the device are two orders of higher magnitude than those of pristine ZnO, attaining values of 2.8 X 10(3) and 1.07 x 10(3), respectively. At the same time, temporal responses faster than 20 ms could be achieved with these solution-processed photodetectors. The present study provides a very important direction to engineer core-shell nanostructured devices for dual wavelength high photosensitivity.