Laser direct writing of graphene photodetector with a wide spectral detection from the visible to the infrared
Yutong Wang, Chunrui Han, Yixuan Zhou, Changjun Ke, Yuanyuan Fan, Yuemin Yang, Zhuo Chen, Yu Wang
Abstract
Laser direct writing of graphene features selective patterns with accurate control, flexibility in substrate choice and environmentally friendly process compared with conventional mechanical exfoliation/chemical deposition methods. Here, we report a photodetector with broad and fast photoresponses (from the visible to the near-infrared spectral range) fabricated by mask-free laser direct writing on polyimide. By optimizing laser parameters, the highest responsivity achieved is 0.25 mA W−1 for visible and 1.34 mA W−1 for near-infrared. The rise and decay times of the photodetectors are less than 4 s for visible light and less than 2 s for the near-infrared. Overall, the one-step laser direct writing of graphene on polyimide proves to be promising for constructing photodetectors, opening more opportunities for cost-effective and high-throughput production of efficient optoelectronic devices.