Flexible optoelectronic devices have been 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 a high performance flexible infrared photodetector is one of the effective strategies to facilitate its practical applications. Pencil-drawing is a popular method in novel electronic and optoelectronic devices, as it is a low cost and facile fabrication process. Herein, we report a novel flexible infrared photodetector using liquid-exfoliated Bi₂Se₃ nanosheets as a light sensitive material, pencil-drawn graphite as the electrodes, and paper as the substrate. 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 a flexible paper substrate, it also well exhibits stability and durability under bending conditions. This work is proposed to be a route to construct a novel flexible infrared photodetector with a facile manufacturing process and low cost.

中文翻译：

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纸上铅笔画石墨电极的二维 Bi2Se3 纳米片基柔性红外光电探测器

近年来，柔性光电器件因其广泛的商业和军事应用而具有重要意义。然而，大多数现有的柔性光电探测器的制造过程都特别复杂和昂贵。采用简便、低成本的方式构建高性能柔性红外光电探测器是促进其实际应用的有效策略之一。铅笔绘图是新型电子和光电设备中的一种流行方法，因为它是一种低成本且易于制造的工艺。_{在此，我们报告了一种使用液体剥离 Bi 2} Se ₃的新型柔性红外光电探测器纳米片作为光敏材料，铅笔画石墨作为电极，纸作为基材。所制造的光电探测器在 1064 nm 红外光照射下表现出高光电流、优异的响应度和长期稳定性。此外，由于铅笔画光电探测器由柔性纸基板制成，因此在弯曲条件下也表现出良好的稳定性和耐用性。这项工作被认为是构建具有简便制造工艺和低成本的新型柔性红外光电探测器的途径。