Teng-Fei Zhang, Zhi-Peng Li, Jiu-Zhen Wang, Wei-Yu Kong, Guo-An Wu, Yu-Zhen Zheng, Yuan-Wei Zhao, En-Xu Yao, Nai-Xi Zhuang, Lin-Bao Luo*
Abstract:  In this study, we present a broadband nano-photodetector based on single-layer graphene (SLG)-carbon nanotube thin film (CNTF) Schottky junction. It is found that the as-fabricated device exhibited obvious sensitivity to a wide range of illumination, with peak sensitivity at 600 and 920 nm. In addition, the SLG-CNTF device had a fast response speed (τr = 68 μs, τf = 78 μs) and good reproducibility in a wide range of switching frequencies (50-5400 Hz). The on-off ratio, responsivity, and detectivity of the device were estimated to be 102, 209 mAW-1 and 4.87×1010 cm Hz1/2W-1, respectively. What is more, other device parameters including linear performance θ and LDR were calculated to be 0.99 and 58.8 dB, respectively, which are relatively better than other carbon nanotube based devices. The totality of the above study signifies that the present SLG-CNTF Schottky junction broadband nano-photodetector may have promising application in future nano-optoelectronic devices and systems.