Two-dimensional Bi2Se3 nanosheets based flexible infrared photodetector with pencil-drawn graphite electrodes on paper
Flexible optoelectronics devices are of great significance in recent years, owing to their extensive commercial and military applications. However, the manufacturing processes of most existing flexible photodetectors are particularly complicated and expensive. Employing a facile and low cost way for constructing high performance flexible infrared photodetector is one of effective strategies to facilitate its practical applications. Pencil-drawn is popular method in novel electronic and optoelectronic devices, which is resulted from low cost and facile fabrication process. Herein, we report a novel flexible infrared photodetector using liquid-exfoliated Bi2Se3 nanosheets as light sensitive material, pencil-drawn graphite as electrodes, and paper as substrate, respectively. The as-fabricated photodetector exhibits high photocurrent, excellent responsivity and long-term stability under 1064 nm infrared light irradiation. In addition, as the pencil-drawn photodetector is made of flexible paper substrate, it also well behaves the stability and durability under the bending condition. This work is proposed to be a route to construct a novel flexible infrared photodetector with facile manufacturing process and low cost.